diff --git a/package.json b/package.json
index c2343c1..2638fcd 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
   "devDependencies": {
     "babel-preset-env": "^1.6.1",
     "js-devbox": "^5.0.0",
-    "mocha": "^4.0.1",
+    "mocha": "^5.0.0",
     "nyc": "^11.4.1",
     "proxyquire": "^1.7.11",
     "sinon": "^4.1.3"
diff --git a/yarn.lock b/yarn.lock
index 535a64c..7b10a66 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3110,9 +3110,9 @@ mkdirp@0.5.1, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
-mocha@^4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-4.0.1.tgz#0aee5a95cf69a4618820f5e51fa31717117daf1b"
+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"