diff --git a/demo/index.js b/demo/index.js
index ed2d1b3..62df486 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -21,7 +21,8 @@ if (process.env.SNYK_TRIGGER_EXTRA_VULN) {
 // create a server with a known vulnerability
 const http = require('http');
 const st = require('st');
-const PORT = process.env.PORT || 3000;
+const ENV_PORT = process.env.PORT;
+const PORT = ENV_PORT !== undefined ? ENV_PORT : 3000;
 
 const server = http.createServer(
   st({
@@ -31,6 +32,7 @@ const server = http.createServer(
   })
 );
 
-server.listen(PORT, () => console.log(`Demo server started, hit http://localhost:${PORT}/hello.txt to try it`));
+server.listen(PORT, () => console.log(
+  `Demo server started, hit http://localhost:${server.address().port}/hello.txt to try it`));
 
 module.exports = server;
diff --git a/package-lock.json b/package-lock.json
index ee3c8a0..aab22da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,18 +4,68 @@
   "lockfileVersion": 1,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
-      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
       "dev": true,
       "requires": {
         "@babel/highlight": "^7.0.0"
       }
     },
-    "@babel/highlight": {
+    "@babel/generator": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.5.5.tgz",
+      "integrity": "sha512-ETI/4vyTSxTzGnU2c49XHv2zhExkv9JHLTwDAFz85kmcwuShvYG2H08FwgIguQf4JC75CBnXAUM5PqeF4fj0nQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.5.5",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
       "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
+      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.4.4"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
       "dev": true,
       "requires": {
         "chalk": "^2.0.0",
@@ -23,10 +73,64 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@babel/parser": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.5.5.tgz",
+      "integrity": "sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==",
+      "dev": true
+    },
+    "@babel/runtime": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.5.5.tgz",
+      "integrity": "sha512-28QvEGyQyNkB0/m2B4FU7IEZGK2NUrcMtT6BZEFALTguLk+AUT6ofsHtPk5QyjAdUkpMJ+/Em+quwz4HOt30AQ==",
+      "dev": true,
+      "requires": {
+        "regenerator-runtime": "^0.13.2"
+      }
+    },
+    "@babel/template": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
+      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.4.4",
+        "@babel/types": "^7.4.4"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.5.5.tgz",
+      "integrity": "sha512-MqB0782whsfffYfSjH4TM+LMjrJnhCNEDMDIjeTpl+ASaUvxcjoiVCo/sM1GhS1pHOXYfWVCYneLjMckuUxDaQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.5.5",
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/parser": "^7.5.5",
+        "@babel/types": "^7.5.5",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.13"
+      }
+    },
+    "@babel/types": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
+      "integrity": "sha512-s63F9nJioLqOlW3UkyMd+BYhXt44YuaFm/VV0VwuteqjYwRrObkU7ra9pY4wAJR3oXi8hJrMcrcJdO/HH33vtw==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.13",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
     "@sinonjs/commons": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.4.0.tgz",
-      "integrity": "sha512-9jHK3YF/8HtJ9wCAbG+j8cD0i0+ATS9A7gXFqS36TblLPNy6rEEc+SB0imo91eCboGaBYGV/MT1/br/J+EE7Tw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.6.0.tgz",
+      "integrity": "sha512-w4/WHG7C4WWFyE5geCieFJF6MZkbW4VAriol5KlmQXpAQdxvV0p26sqNZOW6Qyw6Y0l9K4g+cHvvczR2sEEpqg==",
       "dev": true,
       "requires": {
         "type-detect": "4.0.8"
@@ -43,14 +147,22 @@
       }
     },
     "@sinonjs/samsam": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.0.tgz",
-      "integrity": "sha512-beHeJM/RRAaLLsMJhsCvHK31rIqZuobfPLa/80yGH5hnD8PV1hyh9xJBJNFfNmO7yWqm+zomijHsXpI6iTQJfQ==",
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.3.tgz",
+      "integrity": "sha512-bKCMKZvWIjYD0BLGnNrxVuw4dkWCYsLqFOUWw8VgKF/+5Y+mE7LfHWPIYoDXowH+3a9LsWDMo0uAP8YDosPvHQ==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "^1.0.2",
+        "@sinonjs/commons": "^1.3.0",
         "array-from": "^2.1.1",
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.15"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+          "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+          "dev": true
+        }
       }
     },
     "@sinonjs/text-encoding": {
@@ -65,36 +177,33 @@
       "integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ=="
     },
     "acorn-jsx": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz",
-      "integrity": "sha512-JY+iV6r+cO21KtntVvFkD+iqjtdpRUpGqKWgfkCdZq1R+kbreEl8EcdcJR4SmiIgsIQT33s6QzheQ9a275Q8xw==",
-      "dev": true,
-      "requires": {
-        "acorn": "^5.0.3"
-      }
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
+      "integrity": "sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==",
+      "dev": true
     },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "dev": true,
       "requires": {
-        "co": "^4.6.0",
-        "fast-deep-equal": "^1.0.0",
+        "fast-deep-equal": "^2.0.1",
         "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "ansi-escapes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
-      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
       "dev": true
     },
     "ansi-styles": {
@@ -106,6 +215,37 @@
         "color-convert": "^1.9.0"
       }
     },
+    "anymatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.0.3.tgz",
+      "integrity": "sha512-c6IvoeBECQlMVuYUjSwimnhmztImpErfxJzWZhIQinIvQWoGOnB0dLIgifbPHQt5heS6mNlaZG16f06H3C8t1g==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
+    "archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
+      "dev": true
+    },
+    "arg": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.1.tgz",
+      "integrity": "sha512-SlmP3fEA88MBv0PypnXZ8ZfJhwmDeIE3SP71j37AiXQBXYosPV0x6uISAaHYSlSVhmHOVkomen0tbGk6Anlebw==",
+      "dev": true
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -121,27 +261,6 @@
       "integrity": "sha1-z+nYwmYoudxa7MYqn12PHzUsEZU=",
       "dev": true
     },
-    "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=",
-      "dev": true
-    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -163,6 +282,12 @@
       "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "async-cache": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/async-cache/-/async-cache-0.1.5.tgz",
@@ -180,6 +305,15 @@
         }
       }
     },
+    "async-hook-domain": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/async-hook-domain/-/async-hook-domain-1.1.0.tgz",
+      "integrity": "sha512-NH7V97d1yCbIanu2oDLyPT2GFNct0esPeJyRfkk8J5hTztHVSQp4UiNfL2O42sCA9XZPU8OgHvzOmt9ewBhVqA==",
+      "dev": true,
+      "requires": {
+        "source-map-support": "^0.5.11"
+      }
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -209,23 +343,22 @@
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
       "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
       "dev": true,
-      "optional": true,
       "requires": {
         "tweetnacl": "^0.14.3"
       }
     },
+    "binary-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
+      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "dev": true
+    },
     "bind-obj-methods": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/bind-obj-methods/-/bind-obj-methods-2.0.0.tgz",
       "integrity": "sha512-3/qRXczDi2Cdbz6jE+W3IflJOutRVica8frpBn14de1mBOkzDo+6tY33kNhvkw54Kn3PzRRD2VnGbGPcTAk4sw==",
       "dev": true
     },
-    "bluebird": {
-      "version": "3.5.1",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.1.tgz",
-      "integrity": "sha512-MKiLiV+I1AA596t9w1sQJ8jkiSr5+ZKi0WKrYGUn6d1Fx+Ij4tIj+m2WMQSGczs5jZVxV339chE8iwk6F64wjA==",
-      "dev": true
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -236,25 +369,68 @@
         "concat-map": "0.0.1"
       }
     },
+    "braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "requires": {
+        "fill-range": "^7.0.1"
+      }
+    },
+    "browser-process-hrtime": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz",
+      "integrity": "sha512-9o5UecI3GhkpM6DrXr69PblIuWxPKk9Y0jHBRhdocZ2y7YECBFCsHm79Pr3OyR2AvjhDkabFJaDJMYRazHgsow==",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
-    "caller-path": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+    "caching-transform": {
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+          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.0",
+            "string-width": "^3.0.0",
+            "strip-ansi": "^5.0.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 855b9b6..6dee634 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "scripts": {
     "dump": "node test/dump.js",
     "start": "node demo/index.js",
-    "test": "npm run lint && tap ./test/*.test.js -R spec",
+    "test": "npm run lint && tap --jobs 1 ./test/*.test.js -R spec",
     "lint": "eslint -c .eslintrc lib"
   },
   "keywords": [
@@ -34,19 +34,19 @@
   "author": "snyk.io",
   "license": "Proprietary; see LICENSE",
   "devDependencies": {
-    "eslint": "^5.0.0",
-    "nock": "^10.0.0",
-    "proxyquire": "^2.1.0",
-    "sinon": "^7.2.7",
+    "eslint": "^6.2.2",
+    "nock": "^10.0.6",
+    "proxyquire": "^2.1.3",
+    "sinon": "^7.4.1",
     "sleep-promise": "^8.0.1",
     "st": "^0.1.0",
-    "tap": "^12.0.1"
+    "tap": "^14.6.1"
   },
   "dependencies": {
     "acorn": "5.7.1",
-    "debug": "^4.0.1",
+    "debug": "^4.1.1",
     "needle": "^2.4.0",
-    "semver": "^5.5.1",
-    "uuid": "^3.3.2"
+    "semver": "^6.3.0",
+    "uuid": "^3.3.3"
   }
 }
diff --git a/test/disable.test.js b/test/disable.test.js
index ae309e5..2cdb217 100644
--- a/test/disable.test.js
+++ b/test/disable.test.js
@@ -14,15 +14,18 @@ test('agent can be disabled', async (t) => {
   process.env.SNYK_HOMEBASE_URL = 'http://localhost:7000/api/v1/beacon';
   process.env.SNYK_BEACON_INTERVAL_MS = BEACON_INTERVAL_MS;
   process.env.SNYK_RUNTIME_AGENT_DISABLE = 'yes please';
+  // 0: let the OS pick a free port
+  process.env.PORT = 0;
 
   // bring up the demo server
   const demoApp = require('../demo');
+  const port = demoApp.address().port;
 
   // wait to let the agent go through a cycle
   await sleep(BEACON_INTERVAL_MS);
 
   // trigger the vuln method
-  await needle.get('http://localhost:3000/hello.txt');
+  await needle.get(`http://localhost:${port}/hello.txt`);
 
   // wait to let the agent go through a cycle
   await sleep(BEACON_INTERVAL_MS);
@@ -33,6 +36,7 @@ test('agent can be disabled', async (t) => {
   delete process.env.SNYK_HOMEBASE_URL;
   delete process.env.SNYK_BEACON_INTERVAL_MS;
   delete process.env.SNYK_RUNTIME_AGENT_DISABLE;
+  delete process.env.PORT;
 
-  demoApp.close();
+  await new Promise((resolve) => demoApp.close(resolve));
 });
diff --git a/test/e2e.test.js b/test/e2e.test.js
index 7c9a47e..7ebef29 100644
--- a/test/e2e.test.js
+++ b/test/e2e.test.js
@@ -24,7 +24,6 @@ test('demo app reports a vuln method when called', async (t) => {
         'st': {'st.js': {'Mount.prototype.getPath': null}},
         'mime': {'mime.js': {'Mime.prototype.lookup': null}},
         'negotiator': {'lib/language.js': {'parseLanguage': null}},
-        'js-yaml': {'lib/js-yaml/loader.js': {'storeMappingPair': null}},
       };
       t.deepEqual(beaconData.filters, expectedFilters, 'instrumentation appears in beacon');
       t.ok(beaconData.loadedSources, 'loadedSources present in beacon data');
@@ -64,7 +63,6 @@ test('demo app reports a vuln method when called', async (t) => {
         'st': {'st.js': {'Mount.prototype.getPath': null}},
         'mime': {'mime.js': {'Mime.prototype.lookup': null}},
         'negotiator': {'lib/language.js': {'parseLanguage': null}},
-        'js-yaml': {'lib/js-yaml/loader.js': {'storeMappingPair': null}},
       };
       t.deepEqual(beaconData.filters, expectedFilters, 'instrumentation appears in beacon');
       t.ok(beaconData.loadedSources, 'loadedSources present in beacon data');
@@ -126,7 +124,6 @@ test('demo app reports a vuln method when called', async (t) => {
       'st': {'st.js': {'Mount.prototype.getPath': null, 'Mount.prototype.getUrl': null}},
       'mime': {'mime.js': {'Mime.prototype.lookup': null}},
       'negotiator': {'lib/language.js': {'parseLanguage': null}},
-      'js-yaml': {'lib/js-yaml/loader.js': {'storeMappingPair': null}},
     };
     t.deepEqual(beaconData.filters, expectedFilters, 'instrumentation appears in beacon');
     t.ok(beaconData.loadedSources, 'loadedSources present in beacon data');
@@ -150,15 +147,18 @@ test('demo app reports a vuln method when called', async (t) => {
   process.env.SNYK_BEACON_INTERVAL_MS = BEACON_INTERVAL_MS;
   process.env.SNYK_SNAPSHOT_INTERVAL_MS = SNAPSHOT_INTERVAL_MS;
   process.env.SNYK_TRIGGER_EXTRA_VULN = true;
+  // 0: let the OS pick a free port
+  process.env.PORT = 0;
 
   // bring up the demo server
   const demoApp = require('../demo');
+  const port = demoApp.address().port;
 
   // wait to let the agent go through a cycle
   await sleep(BEACON_INTERVAL_MS);
 
   // trigger the vuln method
-  await needle.get('http://localhost:3000/hello.txt');
+  await needle.get(`http://localhost:${port}/hello.txt`);
 
   // wait to let the agent go through a cycle
   await sleep(BEACON_INTERVAL_MS);
@@ -167,7 +167,7 @@ test('demo app reports a vuln method when called', async (t) => {
   await sleep(SNAPSHOT_INTERVAL_MS - BEACON_INTERVAL_MS * 2);
 
   // trigger the vuln method again
-  await needle.get('http://localhost:3000/hello.txt');
+  await needle.get(`http://localhost:${port}/hello.txt`);
 
   // wait to let the agent go through another cycle with a new snapshot
   await sleep(BEACON_INTERVAL_MS);
@@ -182,6 +182,7 @@ test('demo app reports a vuln method when called', async (t) => {
   delete process.env.SNYK_BEACON_INTERVAL_MS;
   delete process.env.SNYK_SNAPSHOT_INTERVAL_MS;
   delete process.env.SNYK_TRIGGER_EXTRA_VULN;
+  delete process.env.PORT;
 
-  demoApp.close();
+  await new Promise((resolve) => demoApp.close(resolve));
 });
diff --git a/test/failures.test.js b/test/failures.test.js
index 48e6f27..ea33518 100644
--- a/test/failures.test.js
+++ b/test/failures.test.js
@@ -7,6 +7,8 @@ test('node agent does not crash the demo app', async (t) => {
   const BEACON_INTERVAL_MS = 1000;
   process.env.SNYK_HOMEBASE_URL = 'http://localhost:8000/api/v1/beacon';
   process.env.SNYK_BEACON_INTERVAL_MS = BEACON_INTERVAL_MS;
+  // 0: let the OS pick a free port
+  process.env.PORT = 0;
 
   // bring up the demo server, will fail on periodic tasks
   const demoApp = proxyquire('../demo', {
@@ -24,9 +26,9 @@ test('node agent does not crash the demo app', async (t) => {
 
   delete process.env.SNYK_HOMEBASE_URL;
   delete process.env.SNYK_BEACON_INTERVAL_MS;
+  delete process.env.PORT;
 
-  demoApp.close();
-
+  await new Promise((resolve) => demoApp.close(resolve));
 });
 
 test('node agent does not crash the demo app', async (t) => {
@@ -34,6 +36,8 @@ test('node agent does not crash the demo app', async (t) => {
   process.env.SNYK_HOMEBASE_ORIGIN = 'http://localhost:-1';
   process.env.SNYK_BEACON_INTERVAL_MS = BEACON_INTERVAL_MS;
   process.env.SNYK_SNAPSHOT_INTERVAL_MS = 200;
+  // 0: let the OS pick a free port
+  process.env.PORT = 0;
 
   // bring up the demo server, will fail on any outgoing request
   const demoApp = require('../demo');
@@ -44,6 +48,7 @@ test('node agent does not crash the demo app', async (t) => {
   delete process.env.SNYK_HOMEBASE_ORIGIN;
   delete process.env.SNYK_SNAPSHOT_INTERVAL_MS;
   delete process.env.SNYK_BEACON_INTERVAL_MS;
+  delete process.env.PORT;
 
-  demoApp.close();
+  await new Promise((resolve) => demoApp.close(resolve));
 });