diff --git a/package.json b/package.json
index 58b5071..abf942e 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "flow-watch": "^1.1.1",
     "husky": "^0.14.3",
     "istanbul": "^0.4.5",
-    "mocha": "^4.1.0",
+    "mocha": "^5.0.0",
     "nyc": "^11.4.1",
     "rimraf": "^2.6.1",
     "semantic-release": "^12.2.2",
diff --git a/yarn.lock b/yarn.lock
index b9d17c6..0c756c6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3530,9 +3530,9 @@ mkdirp@0.5.1, mkdirp@0.5.x, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
-mocha@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.npmjs.org/mocha/-/mocha-4.1.0.tgz#7d86cfbcf35cb829e2754c32e17355ec05338794"
+mocha@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-5.0.0.tgz#cccac988b0bc5477119cba0e43de7af6d6ad8f4e"
   dependencies:
     browser-stdout "1.3.0"
     commander "2.11.0"