diff --git a/.eslintrc b/.eslintrc
index 5248af3..ca3c940 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,3 +1,3 @@
 {
-  "extends": "groupon/node4"
+  "extends": "groupon/node6"
 }
diff --git a/.gitignore b/.gitignore
index b25e39c..80d33bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
-/yarn.lock
-/package-lock.json
+/.nyc_output
 node_modules/
 /tmp
 npm-debug.log
diff --git a/.travis.yml b/.travis.yml
index 2dd7ef0..387043a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,14 @@
 language: node_js
 node_js:
-  - 4.6.1
-  - 6.11.5
-  - 8.9.0
+  - 6.14.3
+  - 8.11.3
+  - 10.5.0
 deploy:
   - provider: script
     script: ./bin/nlm.js release
     skip_cleanup: true
     'on':
       branch: master
-      node: 8.9.0
+      node: 10.5.0
+before_install:
+  - npm i -g npm@^6
diff --git a/lib/cli.js b/lib/cli.js
index d4a1046..454e129 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -97,6 +97,7 @@ if (argv.version) {
 } else {
   const cwd = process.cwd();
   const packageJsonFile = path.join(cwd, 'package.json');
+  // eslint-disable-next-line import/no-dynamic-require
   const pkg = require(packageJsonFile);
   command(cwd, pkg, pkg.nlm ? _.merge({}, pkg.nlm, argv) : argv)
     .catch(prettyPrintErrorAndExit)
diff --git a/lib/git/commits.js b/lib/git/commits.js
index 396f305..b7c60d4 100644
--- a/lib/git/commits.js
+++ b/lib/git/commits.js
@@ -40,7 +40,7 @@ const run = require('../run');
 
 const SEPARATOR = '---nlm-split---';
 const GIT_LOG_FORMAT = `--format=%H %P\n%B${SEPARATOR}`;
-const PR_MERGE_PATTERN = /^Merge pull request #(\d+) from ([^/]+)\/([\S]+)/;
+const PR_MERGE_PATTERN = /^Merge pull request #(\d+) from ([^\/]+)\/([\S]+)/;
 
 function parseCommit(commit) {
   const metaEndIdx = commit.indexOf('\n');
@@ -54,14 +54,14 @@ function parseCommit(commit) {
   const parentSha = meta.shift() || null;
 
   const data = commitParser.sync(message, {
-    issuePrefixes: ['#', 'https?://\\w[\\w.-]*[\\w/-]+?'],
+    issuePrefixes: ['#', 'https?://[\\w\\.-/]*[-/]+'],
   });
   const prMatch = message.match(PR_MERGE_PATTERN);
   if (prMatch) {
     const prId = prMatch[1];
     data.type = 'pr';
     data.pullId = prId;
-    data.references.push({
+    Object.assign(data.references[0], {
       action: 'Merges',
       owner: prMatch[2],
       repository: null,
diff --git a/lib/git/ensure-tag.js b/lib/git/ensure-tag.js
index 31814e8..b7bb85d 100644
--- a/lib/git/ensure-tag.js
+++ b/lib/git/ensure-tag.js
@@ -52,12 +52,12 @@ function fetchTag(cwd, tag) {
 function ensureTag(cwd, tag) {
   if (tag === 'v0.0.0') {
     // There is no such thing (most likely)
-    return undefined;
+    return null;
   }
 
   const tagFile = path.join(cwd, '.git', 'refs', 'tags', tag);
   try {
-    fs.readFileSync(tagFile);
+    return fs.readFileSync(tagFile);
   } catch (error) {
     if (error.code !== 'ENOENT') {
       throw error;
diff --git a/lib/github/setup-labels.js b/lib/github/setup-labels.js
index 0ad0a13..39c6b16 100644
--- a/lib/github/setup-labels.js
+++ b/lib/github/setup-labels.js
@@ -42,7 +42,7 @@ const REQUIRED_LABELS = [
 ];
 
 function findMissingLabels(labels) {
-  return _.reject(REQUIRED_LABELS, function exists(label) {
+  return _.reject(REQUIRED_LABELS, label => {
     return _.find(labels, { name: label.name });
   });
 }
diff --git a/lib/license/index.js b/lib/license/index.js
index a46423c..91bb53f 100644
--- a/lib/license/index.js
+++ b/lib/license/index.js
@@ -48,7 +48,7 @@ const COMMENT_TYPES = {
     getLicenseHeader: function getLicenseHeader(licenseText) {
       const body = licenseText
         .split('\n')
-        .map(function prefixLine(line) {
+        .map(line => {
           return ` ${`* ${line}`.trim()}`;
         })
         .join('\n');
@@ -78,7 +78,7 @@ function collectFiles(cwd, whitelist, optionalExclude) {
 
   return Bluebird.map(whitelist || ['.'], scanDirectory)
     .then(_.flatten)
-    .map(function loadFile(relFilename) {
+    .map(relFilename => {
       const filename = path.join(cwd, relFilename);
       return Bluebird.props({
         filename: filename,
@@ -103,7 +103,7 @@ function addMissingLicenseHeaders(licenseText, files) {
     '.coffee': COMMENT_TYPES['.coffee'].getLicenseHeader(licenseText),
   };
   return files
-    .map(function buildLicenseHeader(file) {
+    .map(file => {
       file.licenseHeader = licenseHeaders[path.extname(file.filename)];
       return file;
     })
@@ -114,7 +114,7 @@ function addMissingLicenseHeaders(licenseText, files) {
 function getLicenseText(cwd) {
   return readFileAsync(path.join(cwd, 'LICENSE'), 'utf8')
     .then(_.trim)
-    .catch(function catchNotFound(error) {
+    .catch(error => {
       if (error.code === 'ENOENT') {
         return null;
       }
diff --git a/lib/run.js b/lib/run.js
index 2ae8f99..4ad9f68 100644
--- a/lib/run.js
+++ b/lib/run.js
@@ -40,17 +40,17 @@ const _ = require('lodash');
 
 module.exports = function run(command, args, options) {
   debug(command, args, _.omit(options, 'env'));
-  return new Bluebird(function resolveExec(resolve, reject) {
+  return new Bluebird((resolve, reject) => {
     function onExecDone(error, stdout) {
       if (error) return reject(error);
-      resolve(stdout);
+      return resolve(stdout);
     }
 
     const child = childProcess.execFile(command, args, options, onExecDone);
-    child.stdout.on('data', function forwardStdOut(chunk) {
+    child.stdout.on('data', chunk => {
       debug('stdout', chunk.toString().trim());
     });
-    child.stderr.on('data', function forwardStdErr(chunk) {
+    child.stderr.on('data', chunk => {
       debug('stderr', chunk.toString().trim());
     });
   });
diff --git a/lib/steps/changelog.js b/lib/steps/changelog.js
index 4dffd99..4181872 100644
--- a/lib/steps/changelog.js
+++ b/lib/steps/changelog.js
@@ -44,7 +44,7 @@ function addPullRequestCommits(pkg, commits, pr) {
     github.pull.get(pr.pullId),
     github.pull.commits(pr.pullId),
   ])
-    .spread(function expandCommitInfo(info, prCommits) {
+    .spread((info, prCommits) => {
       pr.author = {
         name: info.user.login,
         href: info.user.html_url,
@@ -52,11 +52,11 @@ function addPullRequestCommits(pkg, commits, pr) {
       pr.href = info.html_url;
       pr.title = info.title || info.header;
       const shas = (pr.shas = _.map(prCommits, 'sha'));
-      pr.commits = commits.filter(function isPartOfPR(commit) {
+      pr.commits = commits.filter(commit => {
         return shas.indexOf(commit.sha) !== -1;
       });
     })
-    .catch(function handle404(err) {
+    .catch(err => {
       if (err.statusCode !== 404) throw err;
       // If the PR doesn't exist, handle it gracefully.
       pr.commits = pr.shas = null;
@@ -65,7 +65,7 @@ function addPullRequestCommits(pkg, commits, pr) {
 
 function removePRCommits(commits, prs) {
   const prShas = _.flatten(_.map(prs, 'shas'));
-  return _.filter(commits, function isNotInAnyPR(commit) {
+  return _.filter(commits, commit => {
     return commit.type !== 'pr' && prShas.indexOf(commit.sha) === -1;
   });
 }
@@ -74,16 +74,14 @@ function extractBreakingChanges(commit) {
   if (!commit.notes || !commit.notes.length) {
     return [];
   }
-  return _.filter(commit.notes, { title: 'BREAKING CHANGE' }).map(
-    function buildChangeNote(note) {
-      return { text: note.text, commit: commit };
-    }
-  );
+  return _.filter(commit.notes, { title: 'BREAKING CHANGE' }).map(note => {
+    return { text: note.text, commit: commit };
+  });
 }
 
 function removeInvalidPRs(prs) {
   // Warning: We're doing something evil here and mutate the input array.
-  const filtered = prs.filter(function allCommitsFound(pr) {
+  const filtered = prs.filter(pr => {
     return pr.shas && pr.shas.length === pr.commits.length;
   });
   prs.length = filtered.length;
@@ -152,7 +150,7 @@ function generateChangeLog(cwd, pkg, options) {
   }
 
   function formatPR(pr) {
-    const changes = pr.commits.map(formatCommit).map(function withDashes(line) {
+    const changes = pr.commits.map(formatCommit).map(line => {
       return `  - ${line}`;
     });
 
@@ -172,7 +170,7 @@ function generateChangeLog(cwd, pkg, options) {
     const changes = prs
       .map(formatPR)
       .concat(orphans.map(formatCommit))
-      .map(function star(line) {
+      .map(line => {
         return `* ${line}`;
       });
 
@@ -184,7 +182,7 @@ function generateChangeLog(cwd, pkg, options) {
     .then(_.partial(removePRCommits, commits, prs))
     .then(formatCommits)
     .then(prependBreakingChanges)
-    .then(function setChangelog(changelog) {
+    .then(changelog => {
       options.changelog = changelog;
       return changelog;
     });
diff --git a/lib/steps/pending-changes.js b/lib/steps/pending-changes.js
index 971c334..2ad81ef 100644
--- a/lib/steps/pending-changes.js
+++ b/lib/steps/pending-changes.js
@@ -89,7 +89,7 @@ function normalizeReferences(meta, commit) {
 
 function getPendingChanges(cwd, pkg, options) {
   const meta = parseRepository(pkg.repository);
-  return getCommits(cwd, `v${pkg.version}`).then(function setCommits(commits) {
+  return getCommits(cwd, `v${pkg.version}`).then(commits => {
     options.commits = commits.map(_.partial(normalizeReferences, meta));
   });
 }
diff --git a/lib/steps/publish-to-npm.js b/lib/steps/publish-to-npm.js
index d69bb81..ba3d607 100644
--- a/lib/steps/publish-to-npm.js
+++ b/lib/steps/publish-to-npm.js
@@ -72,7 +72,7 @@ function checkPublishRequired(cwd, pkg, options) {
     cwd: cwd,
     env: options.npmEnv,
   })
-    .then(function parseNpmList(content) {
+    .then(content => {
       // If we get an empty response, we'll assume it was not found.
       if (content.trim() === '') {
         return 'publish';
@@ -87,7 +87,7 @@ function checkPublishRequired(cwd, pkg, options) {
       }
       return 'none';
     })
-    .catch(function handle404(error) {
+    .catch(error => {
       if (error.message.indexOf('ERR! 404') !== -1) {
         return 'publish';
       }
@@ -176,7 +176,7 @@ function publishToNPM(cwd, pkg, options) {
     checkPublishRequired(cwd, pkg, options),
     getCurrentCommit(cwd),
   ])
-    .spread(function checkAndPublish(publishRequired, currentCommit) {
+    .spread((publishRequired, currentCommit) => {
       if (currentCommit !== `v${pkg.version}`) {
         console.log(
           '[nlm] Skipping publish, not a version commit:',
@@ -204,7 +204,7 @@ function publishToNPM(cwd, pkg, options) {
           return null;
       }
     })
-    .finally(function removeTmpRcFile() {
+    .finally(() => {
       fs.unlinkSync(rcFile);
     });
 }
diff --git a/lib/steps/tag-pr.js b/lib/steps/tag-pr.js
index b9dbe22..66578de 100644
--- a/lib/steps/tag-pr.js
+++ b/lib/steps/tag-pr.js
@@ -50,21 +50,19 @@ function tagPullRequest(cwd, pkg, options) {
     return null;
   }
   const github = Github.forRepository(pkg.repository);
-  return github.labels
-    .listByIssue(options.pr)
-    .then(function checkAndChangeLabels(labels) {
-      const releaseType = options.releaseType;
-      const name = `semver-${releaseType}`;
-      if (_.find(labels, { name: name })) {
-        debug('Already tagged with %j', name);
-        return null;
-      }
-      const newLabels = _.map(labels, 'name')
-        .filter(nonSemverTag)
-        .concat(name);
+  return github.labels.listByIssue(options.pr).then(labels => {
+    const releaseType = options.releaseType;
+    const name = `semver-${releaseType}`;
+    if (_.find(labels, { name: name })) {
+      debug('Already tagged with %j', name);
+      return null;
+    }
+    const newLabels = _.map(labels, 'name')
+      .filter(nonSemverTag)
+      .concat(name);
 
-      debug('Tagging %s', options.pr, newLabels);
-      return github.labels.setForIssue(options.pr, newLabels);
-    });
+    debug('Tagging %s', options.pr, newLabels);
+    return github.labels.setForIssue(options.pr, newLabels);
+  });
 }
 module.exports = tagPullRequest;
diff --git a/lib/steps/version-commit.js b/lib/steps/version-commit.js
index 937e991..b70a013 100644
--- a/lib/steps/version-commit.js
+++ b/lib/steps/version-commit.js
@@ -85,7 +85,7 @@ function createVersionCommit(cwd, pkg, options) {
   return addFiles(cwd)
     .then(_.partial(commit, cwd, `v${pkg.version}`))
     .then(_.partial(getHEAD, cwd))
-    .then(function setVersionCommitSha(output) {
+    .then(output => {
       options.versionCommitSha = output.trim();
       return options.versionCommitSha;
     });
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e76d701
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1980 @@
+{
+  "name": "nlm",
+  "version": "3.3.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "JSONStream": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.4.tgz",
+      "integrity": "sha512-Y7vfi3I5oMOYIr+WxV8NZxDSwcbNgzdKYsTNInmycOq9bUYwGg9ryu57Wg5NLmCjqdFPNUmpMBo3kSJN9tCbXg==",
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
+    "acorn": {
+      "version": "5.7.3",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "http://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "^3.0.4"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "http://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
+    "ajv": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "dev": true,
+      "requires": {
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.3.0"
+      }
+    },
+    "ajv-keywords": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "array-find-index": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
+      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E="
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0="
+    },
+    "assertive": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/assertive/-/assertive-2.4.1.tgz",
+      "integrity": "sha512-A+OwJQ+eeVE51SG8pO94sUNfVBW7GH8Z65hLJhR1QpjLS02weO6PStiDJsBi7yi0D4LjL0x58VFN/6rAm9jpfg==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.6.1"
+      }
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+    },
+    "bluebird": {
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.2.tgz",
+      "integrity": "sha512-dhHTWMI7kMx5whMQntl7Vr9C6BvV10lFXDAasnqnrMYhXVCzzk6IO9Fo2L75jXHT07WrOngL1WDXOp+yYS91Yg=="
+    },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
+    "buffer-from": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
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+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 72e2939..1dc67ae 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,10 @@
     "test": "mocha",
     "posttest": "./bin/nlm.js verify"
   },
+  "engines": {
+    "yarn": "0.0.0",
+    "npm": "^6.0.0"
+  },
   "nlm": {
     "license": {
       "files": [
@@ -28,23 +32,24 @@
   },
   "dependencies": {
     "bluebird": "^3.3.3",
-    "conventional-commits-parser": "~0.1.2",
+    "conventional-commits-parser": "^3.0.0",
     "debug": "^2.2.0",
     "glob": "^6.0.1",
     "gofer": "^3.2.0",
-    "lodash": "^4.6.1",
+    "lodash": "^4.17.11",
     "minimist": "^1.2.0",
-    "rc": "^1.1.5",
+    "rc": "^1.2.8",
     "semver": "^5.1.0"
   },
   "devDependencies": {
     "assertive": "^2.1.0",
     "eslint": "^4.7.1",
-    "eslint-config-groupon": "^5.0.0",
+    "eslint-config-groupon": "^6.0.0",
     "eslint-plugin-import": "^2.8.0",
+    "eslint-plugin-mocha": "^4.12.1",
     "eslint-plugin-node": "^5.1.1",
     "eslint-plugin-prettier": "^2.2.0",
-    "mocha": "^3.1.2",
+    "mocha": "^5.2.0",
     "prettier": "^1.6.1"
   },
   "author": {
diff --git a/test/commands/verify.test.js b/test/commands/verify.test.js
index 58363dc..796fdce 100644
--- a/test/commands/verify.test.js
+++ b/test/commands/verify.test.js
@@ -41,43 +41,43 @@ const withFixture = require('../fixture');
 
 const CLI_PATH = require.resolve('../../lib/cli');
 
-describe('nlm verify', function() {
-  describe('in non-git directory', function() {
+describe('nlm verify', () => {
+  describe('in non-git directory', () => {
     const dirname = withFixture('non-git');
     const output = {};
 
-    before(function() {
+    before(() => {
       return run(process.execPath, [CLI_PATH, 'verify'], {
         cwd: dirname,
         env: _.assign({}, process.env, {
           GH_TOKEN: '',
         }),
-      }).then(function(stdout) {
+      }).then(stdout => {
         output.stdout = stdout;
       });
     });
 
-    it('ignores directories that are not git repos', function() {
+    it('ignores directories that are not git repos', () => {
       assert.equal('', output.stdout);
     });
   });
 
-  describe('in git directory', function() {
+  describe('in git directory', () => {
     const dirname = withFixture('released');
     const output = {};
 
-    before(function() {
+    before(() => {
       return run(process.execPath, [CLI_PATH, 'verify'], {
         cwd: dirname,
         env: _.assign({}, process.env, {
           GH_TOKEN: '',
         }),
-      }).then(function(stdout) {
+      }).then(stdout => {
         output.stdout = stdout;
       });
     });
 
-    it('reports the change type', function() {
+    it('reports the change type', () => {
       assert.include('Changes are "none"', output.stdout);
     });
   });
diff --git a/test/fixture.js b/test/fixture.js
index 696d2de..a0fd9fd 100644
--- a/test/fixture.js
+++ b/test/fixture.js
@@ -39,15 +39,15 @@ function withFixture(name) {
   const dirname = path.join(__dirname, '..', 'tmp', name);
   const script = path.join(__dirname, 'fixtures', name);
 
-  before('remove fixture directory', function rmDir(done) {
+  before('remove fixture directory', done => {
     execFile('rm', ['-rf', dirname], done);
   });
 
-  before('create fixture directory', function createDir(done) {
+  before('create fixture directory', done => {
     execFile('mkdir', ['-p', dirname], done);
   });
 
-  before('running fixture setup', function runFixture(done) {
+  before('running fixture setup', done => {
     execFile(
       script,
       [script],
@@ -61,7 +61,7 @@ function withFixture(name) {
           GIT_COMMITTER_EMAIL: 'rdev@example.com',
         },
       },
-      function logErrorDetails(error, stdout, stderr) {
+      (error, stdout, stderr) => {
         if (error) {
           process.stdout.write(`${stdout}\n`);
           process.stderr.write(`${stderr}\n`);
@@ -71,7 +71,7 @@ function withFixture(name) {
     );
   });
 
-  after('remove fixture directory', function removeFixture(done) {
+  after('remove fixture directory', done => {
     execFile('rm', ['-rf', dirname], done);
   });
 
diff --git a/test/git/commits.test.js b/test/git/commits.test.js
index f685087..d17cc91 100644
--- a/test/git/commits.test.js
+++ b/test/git/commits.test.js
@@ -39,22 +39,22 @@ const getCommits = require('../../lib/git/commits');
 
 const withFixture = require('../fixture');
 
-describe('getCommits', function() {
-  describe('with an empty project', function() {
+describe('getCommits', () => {
+  describe('with an empty project', () => {
     const dirname = withFixture('empty-project');
 
-    it('returns an empty list', function() {
-      return getCommits(dirname).then(function(commits) {
+    it('returns an empty list', () => {
+      return getCommits(dirname).then(commits => {
         assert.deepEqual([], commits);
       });
     });
   });
 
-  describe('with invalid commits', function() {
+  describe('with invalid commits', () => {
     const dirname = withFixture('invalid-commit');
 
-    it('returns the commit with type=null', function() {
-      return getCommits(dirname).then(function(commits) {
+    it('returns the commit with type=null', () => {
+      return getCommits(dirname).then(commits => {
         assert.equal(2, commits.length);
         assert.equal(null, commits[0].type);
         assert.equal("This ain't no valid commit message", commits[0].header);
@@ -63,17 +63,17 @@ describe('getCommits', function() {
     });
   });
 
-  describe('issue and ticket links', function() {
+  describe('issue and ticket links', () => {
     const dirname = withFixture('ticket-commits');
     let allCommits = null;
 
-    before('fetch al commits', function() {
-      return getCommits(dirname).then(function(commits) {
+    before('fetch al commits', () => {
+      return getCommits(dirname).then(commits => {
         allCommits = commits;
       });
     });
 
-    it('includes links to github for #123 style', function() {
+    it('includes links to github for #123 style', () => {
       const commit = _.find(allCommits, { subject: 'Short' });
       assert.equal(1, commit.references.length);
       const ref = commit.references[0];
@@ -84,7 +84,7 @@ describe('getCommits', function() {
       assert.equal('#42', ref.raw);
     });
 
-    it('includes links to github for x/y#123 style', function() {
+    it('includes links to github for x/y#123 style', () => {
       const commit = _.find(allCommits, { subject: 'Repo' });
       assert.equal(1, commit.references.length);
       const ref = commit.references[0];
@@ -95,7 +95,7 @@ describe('getCommits', function() {
       assert.equal('riley/thing#13', ref.raw);
     });
 
-    it('includes links to github for full public github urls', function() {
+    it('includes links to github for full public github urls', () => {
       const commit = _.find(allCommits, { subject: 'Full' });
       assert.equal(1, commit.references.length);
       const ref = commit.references[0];
@@ -105,7 +105,7 @@ describe('getCommits', function() {
       assert.equal('https://github.com/open/source/issues/13', ref.raw);
     });
 
-    it('includes links to github for full GHE urls', function() {
+    it('includes links to github for full GHE urls', () => {
       const commit = _.find(allCommits, { subject: 'GHE' });
       assert.equal(1, commit.references.length);
       const ref = commit.references[0];
@@ -115,7 +115,7 @@ describe('getCommits', function() {
       assert.equal('https://github.example.com/some/thing/issues/72', ref.raw);
     });
 
-    it('includes links to jira', function() {
+    it('includes links to jira', () => {
       const commit = _.find(allCommits, { subject: 'Jira' });
       assert.equal(1, commit.references.length);
       const ref = commit.references[0];
@@ -126,27 +126,27 @@ describe('getCommits', function() {
     });
   });
 
-  describe('with multiple commits', function() {
+  describe('with multiple commits', () => {
     const dirname = withFixture('multiple-commits');
     let allCommits = null;
 
-    before('fetch al commits', function() {
-      return getCommits(dirname).then(function(commits) {
+    before('fetch al commits', () => {
+      return getCommits(dirname).then(commits => {
         allCommits = commits;
       });
     });
 
-    it('returns all three commits, plus one merge commit', function() {
+    it('returns all three commits, plus one merge commit', () => {
       assert.equal(4, allCommits.length);
     });
 
-    it('returns commits in order', function() {
+    it('returns commits in order', () => {
       assert.equal('Do stuff', allCommits[0].subject);
       assert.equal('Adding second', allCommits[1].subject);
       assert.equal('Changed more stuff', allCommits[2].subject);
     });
 
-    it('includes parentSha', function() {
+    it('includes parentSha', () => {
       assert.equal('is null for first commit', null, allCommits[0].parentSha);
       assert.equal(
         'points to the immediate parent for other commits',
@@ -155,7 +155,7 @@ describe('getCommits', function() {
       );
     });
 
-    it('includes notes for breaking changes', function() {
+    it('includes notes for breaking changes', () => {
       const note = allCommits[1].notes[0];
       assert.equal('BREAKING CHANGE', note.title);
       assert.equal(
@@ -168,24 +168,24 @@ describe('getCommits', function() {
       );
     });
 
-    it('includes merge commit info', function() {
+    it('includes merge commit info', () => {
       const merge = allCommits[3];
       assert.equal(merge.type, 'pr');
       assert.equal(merge.references[0].action, 'Merges');
       assert.equal(merge.references[0].issue, '119');
     });
 
-    describe('when starting from v0.0.0', function() {
-      it('returns everything from the beginning', function() {
-        return getCommits(dirname, 'v0.0.0').then(function(commits) {
+    describe('when starting from v0.0.0', () => {
+      it('returns everything from the beginning', () => {
+        return getCommits(dirname, 'v0.0.0').then(commits => {
           assert.equal(allCommits.length, commits.length);
         });
       });
     });
 
-    describe('when starting from the first commit', function() {
-      it('only returns the last two', function() {
-        return getCommits(dirname, allCommits[0].sha).then(function(commits) {
+    describe('when starting from the first commit', () => {
+      it('only returns the last two', () => {
+        return getCommits(dirname, allCommits[0].sha).then(commits => {
           assert.deepEqual(allCommits.slice(1), commits);
         });
       });
diff --git a/test/git/verify-clean.test.js b/test/git/verify-clean.test.js
index d6acfd5..762ea21 100644
--- a/test/git/verify-clean.test.js
+++ b/test/git/verify-clean.test.js
@@ -42,28 +42,28 @@ function unexpected() {
   throw new Error('Should have failed');
 }
 
-describe('verifyClean', function() {
-  describe('with an empty project', function() {
+describe('verifyClean', () => {
+  describe('with an empty project', () => {
     const dirname = withFixture('empty-project');
 
-    it('returns true', function() {
+    it('returns true', () => {
       return verifyClean(dirname).then(assert.expect);
     });
   });
 
-  describe('with committed changes', function() {
+  describe('with committed changes', () => {
     const dirname = withFixture('fix-commit');
 
-    it('returns true', function() {
+    it('returns true', () => {
       return verifyClean(dirname).then(assert.expect);
     });
   });
 
-  describe('with uncommitted or unstaged changes', function() {
+  describe('with uncommitted or unstaged changes', () => {
     const dirname = withFixture('dirty-checkout');
 
-    it('reports the files in question', function() {
-      return verifyClean(dirname).then(unexpected, function(error) {
+    it('reports the files in question', () => {
+      return verifyClean(dirname).then(unexpected, error => {
         assert.include('M  index.js', error.message);
         assert.include('?? untracked.js', error.message);
       });
diff --git a/test/github/parse-repository.test.js b/test/github/parse-repository.test.js
index 9538087..1ed9b11 100644
--- a/test/github/parse-repository.test.js
+++ b/test/github/parse-repository.test.js
@@ -42,8 +42,8 @@ function checkParsed(expected, name) {
   assert.deepEqual(expected, result);
 }
 
-describe('parseRepository', function() {
-  describe('github.com', function() {
+describe('parseRepository', () => {
+  describe('github.com', () => {
     const expected = {
       baseUrl: 'https://api.github.com',
       htmlBase: 'https://github.com',
@@ -51,7 +51,7 @@ describe('parseRepository', function() {
       repository: 'myproject',
     };
 
-    it('understands ssh urls', function() {
+    it('understands ssh urls', () => {
       [
         'git+ssh://git@github.com/myname/myproject',
         'git+ssh://git@github.com/myname/myproject.git',
@@ -60,25 +60,25 @@ describe('parseRepository', function() {
       ].forEach(_.partial(checkParsed, expected));
     });
 
-    it('understands https urls', function() {
+    it('understands https urls', () => {
       [
         'https://github.com/myname/myproject',
         'https://github.com/myname/myproject.git',
       ].forEach(_.partial(checkParsed, expected));
     });
 
-    it('understands git urls', function() {
+    it('understands git urls', () => {
       [
         'git://github.com/myname/myproject',
         'git://github.com/myname/myproject.git',
       ].forEach(_.partial(checkParsed, expected));
     });
 
-    it('understands npm-style shorthands', function() {
+    it('understands npm-style shorthands', () => {
       ['myname/myproject'].forEach(_.partial(checkParsed, expected));
     });
 
-    it('accepts dotted repositories', function() {
+    it('accepts dotted repositories', () => {
       ['myname/myproject.js.git', 'myname/myproject.js'].forEach(
         _.partial(
           checkParsed,
@@ -88,7 +88,7 @@ describe('parseRepository', function() {
     });
   });
 
-  describe('Github Enterprise', function() {
+  describe('Github Enterprise', () => {
     const expected = {
       baseUrl: 'https://ghe.mycorp.com/api/v3',
       htmlBase: 'https://ghe.mycorp.com',
@@ -96,7 +96,7 @@ describe('parseRepository', function() {
       repository: 'myproject',
     };
 
-    it('understands ssh urls', function() {
+    it('understands ssh urls', () => {
       [
         'git@ghe.mycorp.com:myname/myproject',
         'git@ghe.mycorp.com:myname/myproject.git',
@@ -105,14 +105,14 @@ describe('parseRepository', function() {
       ].forEach(_.partial(checkParsed, expected));
     });
 
-    it('understands https urls', function() {
+    it('understands https urls', () => {
       [
         'https://ghe.mycorp.com/myname/myproject',
         'https://ghe.mycorp.com/myname/myproject.git',
       ].forEach(_.partial(checkParsed, expected));
     });
 
-    it('understands git urls', function() {
+    it('understands git urls', () => {
       [
         'git://ghe.mycorp.com/myname/myproject',
         'git://ghe.mycorp.com/myname/myproject.git',
diff --git a/test/github/setup-labels.test.js b/test/github/setup-labels.test.js
index 73d5d51..fa3f509 100644
--- a/test/github/setup-labels.test.js
+++ b/test/github/setup-labels.test.js
@@ -39,18 +39,21 @@ const setupLabels = require('../../lib/github/setup-labels');
 
 const packageJSON = require('../../package.json');
 
-describe('setupLabels', function() {
-  describe('self-test', function() {
+describe('setupLabels', () => {
+  describe('self-test', () => {
     if (!process.env.GH_TOKEN) {
-      return it('skipping, no GH_TOKEN');
+      it('skipping, no GH_TOKEN');
+      return null;
     }
 
     const github = Github.forRepository(packageJSON.repository);
 
-    it('finds no missing labels for nlm', function() {
-      return setupLabels(github).then(function(addedLabels) {
+    it('finds no missing labels for nlm', () => {
+      return setupLabels(github).then(addedLabels => {
         assert.deepEqual([], addedLabels);
       });
     });
+
+    return null;
   });
 });
diff --git a/test/license/index.test.js b/test/license/index.test.js
index 94713f0..a20a42b 100644
--- a/test/license/index.test.js
+++ b/test/license/index.test.js
@@ -40,26 +40,26 @@ const addLicenseHeaders = require('../../lib/license');
 
 const withFixture = require('../fixture');
 
-describe('addLicenseHeaders', function() {
-  it('does not try to add additional headers to nlm', function() {
-    return addLicenseHeaders(process.cwd(), ['lib', 'test']).then(function(
-      changedFiles
-    ) {
-      assert.deepEqual([], changedFiles);
-    });
+describe('addLicenseHeaders', () => {
+  it('does not try to add additional headers to nlm', () => {
+    return addLicenseHeaders(process.cwd(), ['lib', 'test']).then(
+      changedFiles => {
+        assert.deepEqual([], changedFiles);
+      }
+    );
   });
 
-  describe('without a LICENSE file', function() {
+  describe('without a LICENSE file', () => {
     const dirname = withFixture('fix-commit');
 
-    it('does nothing', function() {
-      return addLicenseHeaders(dirname).then(function(changedFiles) {
+    it('does nothing', () => {
+      return addLicenseHeaders(dirname).then(changedFiles => {
         assert.deepEqual([], changedFiles);
       });
     });
   });
 
-  describe('with a file w/o license header', function() {
+  describe('with a file w/o license header', () => {
     const dirname = withFixture('fix-commit');
     const filename = `${dirname}/index.js`;
 
@@ -67,17 +67,17 @@ describe('addLicenseHeaders', function() {
     const licenseHeader =
       '/*\n * IMPORTANT\n *\n * LEGAL\n * STUFF HERE!\n */\n';
 
-    before('write license file', function() {
+    before('write license file', () => {
       fs.writeFileSync(`${dirname}/LICENSE`, licenseText);
     });
 
-    before('returns the absolute filename', function() {
-      return addLicenseHeaders(dirname).then(function(changedFiles) {
+    before('returns the absolute filename', () => {
+      return addLicenseHeaders(dirname).then(changedFiles => {
         assert.deepEqual([filename], changedFiles);
       });
     });
 
-    it('writes out a file with a license header', function() {
+    it('writes out a file with a license header', () => {
       const content = fs.readFileSync(filename, 'utf8');
       assert.include(licenseHeader, content);
       assert.expect(
diff --git a/test/steps/changelog.test.js b/test/steps/changelog.test.js
index 4408e8e..9b118ae 100644
--- a/test/steps/changelog.test.js
+++ b/test/steps/changelog.test.js
@@ -40,8 +40,8 @@ function withFakeGithub() {
   const httpCalls = [];
   let server;
 
-  before(function(done) {
-    server = require('http').createServer(function(req, res) {
+  before(done => {
+    server = require('http').createServer((req, res) => {
       httpCalls.push({
         method: req.method,
         url: req.url,
@@ -98,24 +98,24 @@ function withFakeGithub() {
     server.listen(3000, done);
   });
 
-  after(function(done) {
+  after(done => {
     server.close(done);
   });
 
   return httpCalls;
 }
 
-describe('generateChangeLog', function() {
-  it('can create an empty changelog', function() {
+describe('generateChangeLog', () => {
+  it('can create an empty changelog', () => {
     const pkg = { repository: 'usr/proj' };
     const commits = [];
     const options = { commits: commits };
-    return generateChangeLog(null, pkg, options).then(function(changelog) {
+    return generateChangeLog(null, pkg, options).then(changelog => {
       assert.equal('', changelog);
     });
   });
 
-  it('links to github issues and jira tickets', function() {
+  it('links to github issues and jira tickets', () => {
     const pkg = { repository: 'usr/proj' };
     const commits = [
       {
@@ -154,7 +154,7 @@ describe('generateChangeLog', function() {
     const options = { commits: commits };
     const href0 = `https://github.com/usr/proj/commit/${commits[0].sha}`;
     const href1 = `https://github.com/usr/proj/commit/${commits[1].sha}`;
-    return generateChangeLog(null, pkg, options).then(function(changelog) {
+    return generateChangeLog(null, pkg, options).then(changelog => {
       const lines = changelog.split('\n');
       assert.equal(
         `* [\`1234567\`](${href0}) **fix:** Stop doing the wrong thing - see: ` +
@@ -170,7 +170,7 @@ describe('generateChangeLog', function() {
     });
   });
 
-  it('can create a changelog for two commits', function() {
+  it('can create a changelog for two commits', () => {
     const pkg = { repository: 'usr/proj' };
     const commits = [
       {
@@ -187,7 +187,7 @@ describe('generateChangeLog', function() {
     const options = { commits: commits };
     const href0 = `https://github.com/usr/proj/commit/${commits[0].sha}`;
     const href1 = `https://github.com/usr/proj/commit/${commits[1].sha}`;
-    return generateChangeLog(null, pkg, options).then(function(changelog) {
+    return generateChangeLog(null, pkg, options).then(changelog => {
       assert.equal(
         [
           `* [\`1234567\`](${href0}) **fix:** Stop doing the wrong thing`,
@@ -198,7 +198,7 @@ describe('generateChangeLog', function() {
     });
   });
 
-  it('puts breaking changes ahead of everything else', function() {
+  it('puts breaking changes ahead of everything else', () => {
     const pkg = { repository: 'usr/proj' };
     const commits = [
       {
@@ -221,7 +221,7 @@ describe('generateChangeLog', function() {
     const options = { commits: commits };
     const href0 = `https://github.com/usr/proj/commit/${commits[0].sha}`;
     const href1 = `https://github.com/usr/proj/commit/${commits[1].sha}`;
-    return generateChangeLog(null, pkg, options).then(function(changelog) {
+    return generateChangeLog(null, pkg, options).then(changelog => {
       assert.equal(
         [
           '#### Breaking Changes',
@@ -240,7 +240,7 @@ describe('generateChangeLog', function() {
     });
   });
 
-  describe('pull request commits', function() {
+  describe('pull request commits', () => {
     const httpCalls = withFakeGithub();
     const pkg = { repository: 'http://127.0.0.1:3000/usr/proj' };
     const commits = [
@@ -264,23 +264,23 @@ describe('generateChangeLog', function() {
     const options = { commits: commits };
     let changelog = null;
 
-    before('generateChangeLog', function() {
-      return generateChangeLog(null, pkg, options).then(function(_changelog) {
+    before('generateChangeLog', () => {
+      return generateChangeLog(null, pkg, options).then(_changelog => {
         changelog = _changelog;
       });
     });
 
-    it('calls out to github to get PR info', function() {
+    it('calls out to github to get PR info', () => {
       assert.equal(2, httpCalls.length);
     });
 
-    it('groups commits by pull request', function() {
+    it('groups commits by pull request', () => {
       assert.include('* PR #1 Title', changelog);
       assert.include('  - [`1234567`]', changelog);
     });
   });
 
-  describe('with an invalid PR', function() {
+  describe('with an invalid PR', () => {
     const httpCalls = withFakeGithub();
     const pkg = { repository: 'http://127.0.0.1:3000/usr/proj' };
     const commits = [
@@ -301,7 +301,7 @@ describe('generateChangeLog', function() {
         pullId: '2',
       },
     ];
-    const sloppyCommits = commits.map(function(commit) {
+    const sloppyCommits = commits.map(commit => {
       if (commit.type === 'pr') return commit;
       return { sha: commit.sha, header: commit.subject };
     });
@@ -309,36 +309,36 @@ describe('generateChangeLog', function() {
     let changelog = null;
     let sloppyChangelog = null;
 
-    before('generateChangeLog', function() {
-      return generateChangeLog(null, pkg, options).then(function(_changelog) {
+    before('generateChangeLog', () => {
+      return generateChangeLog(null, pkg, options).then(_changelog => {
         changelog = _changelog;
       });
     });
 
-    before('generateSloppyChangeLog', function() {
+    before('generateSloppyChangeLog', () => {
       return generateChangeLog(null, pkg, { commits: sloppyCommits }).then(
-        function(_changelog) {
+        _changelog => {
           sloppyChangelog = _changelog;
         }
       );
     });
 
-    it('calls out to github to get PR info', function() {
+    it('calls out to github to get PR info', () => {
       assert.equal(4, httpCalls.length);
     });
 
-    it('ignores the PR', function() {
+    it('ignores the PR', () => {
       assert.notInclude('* PR #2 Title', changelog);
       assert.include('* [`1234567`]', changelog);
     });
 
-    it('handles poorly formatted commit messages too', function() {
+    it('handles poorly formatted commit messages too', () => {
       assert.include(') Stop doing the wrong thing\n', sloppyChangelog);
       assert.include(') Do more things', sloppyChangelog);
     });
   });
 
-  describe('with a missing PR', function() {
+  describe('with a missing PR', () => {
     const httpCalls = withFakeGithub();
     const pkg = { repository: 'http://127.0.0.1:3000/usr/proj' };
     const commits = [
@@ -362,17 +362,17 @@ describe('generateChangeLog', function() {
     const options = { commits: commits };
     let changelog = null;
 
-    before('generateChangeLog', function() {
-      return generateChangeLog(null, pkg, options).then(function(_changelog) {
+    before('generateChangeLog', () => {
+      return generateChangeLog(null, pkg, options).then(_changelog => {
         changelog = _changelog;
       });
     });
 
-    it('calls out to github to get PR info', function() {
+    it('calls out to github to get PR info', () => {
       assert.equal(2, httpCalls.length);
     });
 
-    it('ignores the PR', function() {
+    it('ignores the PR', () => {
       assert.include('* [`1234567`]', changelog);
     });
   });
diff --git a/test/steps/pending-changes.test.js b/test/steps/pending-changes.test.js
index 0e255f8..716900b 100644
--- a/test/steps/pending-changes.test.js
+++ b/test/steps/pending-changes.test.js
@@ -39,7 +39,7 @@ const getPendingChanges = require('../../lib/steps/pending-changes');
 
 const withFixture = require('../fixture');
 
-describe('getPendingChanges', function() {
+describe('getPendingChanges', () => {
   const dirname = withFixture('ticket-commits');
   const pkg = {
     version: '0.0.0',
@@ -47,15 +47,15 @@ describe('getPendingChanges', function() {
   };
   const options = {};
 
-  before('create version commit', function() {
+  before('create version commit', () => {
     return getPendingChanges(dirname, pkg, options);
   });
 
-  it('adds the commits to the options', function() {
+  it('adds the commits to the options', () => {
     assert.hasType(Array, options.commits);
   });
 
-  it('resolves commit references', function() {
+  it('resolves commit references', () => {
     const commit = _.find(options.commits, { subject: 'Jira' });
     assert.equal(1, commit.references.length);
     const ref = commit.references[0];
@@ -63,7 +63,7 @@ describe('getPendingChanges', function() {
     assert.equal('https://jira.atlassian.com/browse/REPO-2001', ref.href);
   });
 
-  it('truncates full urls to same repo', function() {
+  it('truncates full urls to same repo', () => {
     const commit = _.find(options.commits, { subject: 'Truncate' });
     assert.equal(1, commit.references.length);
     const ref = commit.references[0];
@@ -71,7 +71,7 @@ describe('getPendingChanges', function() {
     assert.equal('https://github.com/usr/proj/issues/44', ref.href);
   });
 
-  it('builds nice references to sibling repos', function() {
+  it('builds nice references to sibling repos', () => {
     const commit = _.find(options.commits, { subject: 'Full' });
     assert.equal(1, commit.references.length);
     const ref = commit.references[0];
@@ -79,7 +79,7 @@ describe('getPendingChanges', function() {
     assert.equal('https://github.com/open/source/issues/13', ref.href);
   });
 
-  it('expands short-style refs', function() {
+  it('expands short-style refs', () => {
     const commit = _.find(options.commits, { subject: 'Short' });
     assert.equal(1, commit.references.length);
     const ref = commit.references[0];
@@ -87,7 +87,7 @@ describe('getPendingChanges', function() {
     assert.equal('https://github.com/usr/proj/issues/42', ref.href);
   });
 
-  it('supports refs to other Github instances', function() {
+  it('supports refs to other Github instances', () => {
     const commit = _.find(options.commits, { subject: 'GHE' });
     assert.equal(1, commit.references.length);
     const ref = commit.references[0];
diff --git a/test/steps/publish-to-npm.test.js b/test/steps/publish-to-npm.test.js
index c672d4b..46bcb45 100644
--- a/test/steps/publish-to-npm.test.js
+++ b/test/steps/publish-to-npm.test.js
@@ -30,6 +30,8 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/* eslint-disable import/no-dynamic-require */
+
 'use strict';
 
 const assert = require('assertive');
@@ -43,8 +45,8 @@ function withFakeRegistry() {
   const httpCalls = [];
   let server;
 
-  before(function(done) {
-    server = require('http').createServer(function(req, res) {
+  before(done => {
+    server = require('http').createServer((req, res) => {
       httpCalls.push({
         method: req.method,
         url: req.url,
@@ -55,20 +57,20 @@ function withFakeRegistry() {
         return res.end('{}');
       }
       res.statusCode = 200;
-      res.end('{"ok":true}');
+      return res.end('{"ok":true}');
     });
     server.listen(3000, done);
   });
 
-  after(function(done) {
+  after(done => {
     server.close(done);
   });
 
   return httpCalls;
 }
 
-describe('publishToNpm', function() {
-  describe('with NPM_USERNAME etc.', function() {
+describe('publishToNpm', () => {
+  describe('with NPM_USERNAME etc.', () => {
     const dirname = withFixture('released');
     const httpCalls = withFakeRegistry();
 
@@ -82,7 +84,7 @@ describe('publishToNpm', function() {
         npmPasswordBase64: new Buffer('passw0rd').toString('base64'),
         npmEmail: 'robin@example.com',
         npmToken: '',
-      }).then(function() {
+      }).then(() => {
         assert.deepEqual(
           {
             method: 'PUT',
@@ -110,14 +112,14 @@ describe('publishToNpm', function() {
     );
   }
 
-  describe('with NPM_TOKEN etc.', function() {
+  describe('with NPM_TOKEN etc.', () => {
     const dirname = withFixture('released');
     const httpCalls = withFakeRegistry();
 
     it('uses a bearer token', function() {
       this.timeout(4000);
       const pkg = require(`${dirname}/package.json`);
-      return publishToNpm(dirname, pkg, getTokenOptions()).then(function() {
+      return publishToNpm(dirname, pkg, getTokenOptions()).then(() => {
         assert.deepEqual(
           {
             method: 'PUT',
@@ -130,34 +132,34 @@ describe('publishToNpm', function() {
     });
   });
 
-  describe('without --commmit', function() {
+  describe('without --commmit', () => {
     const dirname = withFixture('released');
     const httpCalls = withFakeRegistry();
 
-    it('makes no http calls', function() {
+    it('makes no http calls', () => {
       const opts = getTokenOptions({ commit: false });
       return publishToNpm(
         dirname,
         require(`${dirname}/package.json`),
         opts
-      ).then(function() {
+      ).then(() => {
         assert.deepEqual([], httpCalls);
       });
     });
   });
 
-  describe('if the package is set to private', function() {
+  describe('if the package is set to private', () => {
     const dirname = withFixture('released');
     const httpCalls = withFakeRegistry();
 
-    it('makes no http calls', function() {
+    it('makes no http calls', () => {
       const pkg = _.defaults(
         {
           private: true,
         },
         require(`${dirname}/package.json`)
       );
-      return publishToNpm(dirname, pkg, getTokenOptions()).then(function() {
+      return publishToNpm(dirname, pkg, getTokenOptions()).then(() => {
         assert.deepEqual([], httpCalls);
       });
     });
diff --git a/test/steps/release-info.test.js b/test/steps/release-info.test.js
index 0dbd195..5592f57 100644
--- a/test/steps/release-info.test.js
+++ b/test/steps/release-info.test.js
@@ -40,23 +40,23 @@ const determineReleaseInfo = require('../../lib/steps/release-info');
 
 const withFixture = require('../fixture');
 
-describe('determineReleaseInfo', function() {
-  it('returns "none" for an empty list of commits', function() {
+describe('determineReleaseInfo', () => {
+  it('returns "none" for an empty list of commits', () => {
     assert.equal('none', determineReleaseInfo([]));
   });
 
-  describe('with invalid commit messages', function() {
+  describe('with invalid commit messages', () => {
     const dirname = withFixture('invalid-commit');
 
     let commits = [];
-    before('load commits', function() {
-      return getCommits(dirname).then(function(results) {
+    before('load commits', () => {
+      return getCommits(dirname).then(results => {
         commits = results;
       });
     });
 
-    it('rejects them with a helpful message', function() {
-      const error = assert.throws(function() {
+    it('rejects them with a helpful message', () => {
+      const error = assert.throws(() => {
         determineReleaseInfo(commits);
       });
 
@@ -93,8 +93,8 @@ describe('determineReleaseInfo', function() {
       );
     });
 
-    describe('with --acceptInvalidCommits', function() {
-      it('is cautious and considers it "major"', function() {
+    describe('with --acceptInvalidCommits', () => {
+      it('is cautious and considers it "major"', () => {
         assert.equal('major', determineReleaseInfo(commits, true));
       });
     });
diff --git a/test/steps/version-commit.test.js b/test/steps/version-commit.test.js
index b1f5bb0..240e00a 100644
--- a/test/steps/version-commit.test.js
+++ b/test/steps/version-commit.test.js
@@ -41,7 +41,7 @@ const createVersionCommit = require('../../lib/steps/version-commit');
 
 const withFixture = require('../fixture');
 
-describe('createVersionCommit', function() {
+describe('createVersionCommit', () => {
   const dirname = withFixture('multiple-commits');
   const pkg = {
     name: 'some-package',
@@ -52,28 +52,28 @@ describe('createVersionCommit', function() {
     changelog: '* New stuff\n* Interesting features',
   };
 
-  before('commits with the original author', function(done) {
-    execFile('git', ['show'], { cwd: dirname }, function(err, stdout) {
+  before('commits with the original author', done => {
+    execFile('git', ['show'], { cwd: dirname }, (err, stdout) => {
       if (err) return done(err);
       assert.include('Author: Robin Developer <rdev@example.com>', stdout);
-      done();
+      return done();
     });
   });
 
-  before('create version commit', function() {
+  before('create version commit', () => {
     return createVersionCommit(dirname, pkg, options);
   });
 
-  it('writes the correct HEAD sha', function() {
+  it('writes the correct HEAD sha', () => {
     const HEAD = fs.readFileSync(`${dirname}/.git/refs/heads/master`, 'utf8');
     assert.equal(HEAD.trim(), options.versionCommitSha);
   });
 
-  it('commits with the proper user', function(done) {
-    execFile('git', ['show'], { cwd: dirname }, function(err, stdout) {
+  it('commits with the proper user', done => {
+    execFile('git', ['show'], { cwd: dirname }, (err, stdout) => {
       if (err) return done(err);
       assert.include('Author: nlm <opensource@groupon.com>', stdout);
-      done();
+      return done();
     });
   });
 });