diff --git a/package.json b/package.json
index 0cebb8a..9b77e9c 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   "devDependencies": {
     "ava": "0.18.2",
     "common-tags": "1.4.0",
-    "coveralls": "2.12.0",
+    "coveralls": "2.13.3",
     "eslint": "3.18.0",
     "eslint-plugin-ava": "4.2.0",
     "fs-extra": "2.1.2",
diff --git a/yarn.lock b/yarn.lock
index c8348c6..e6d6209 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1025,9 +1025,9 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-coveralls@2.12.0:
-  version "2.12.0"
-  resolved "https://registry.yarnpkg.com/coveralls/-/coveralls-2.12.0.tgz#b3d064108e29728385b56e42fc2d119f43e0e517"
+coveralls@2.13.3:
+  version "2.13.3"
+  resolved "https://registry.yarnpkg.com/coveralls/-/coveralls-2.13.3.tgz#9ad7c2ae527417f361e8b626483f48ee92dd2bc7"
   dependencies:
     js-yaml "3.6.1"
     lcov-parse "0.0.10"