diff --git a/package.json b/package.json
index 6990d78..0ae48ca 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
   "devDependencies": {
     "codecov": "3.0.2",
     "expect": "1.20.2",
-    "mocha": "3.4.2",
+    "mocha": "3.5.3",
     "nodemon": "1.11.0",
     "npm-run-all": "4.1.3",
     "prettier": "1.12.1"
diff --git a/yarn.lock b/yarn.lock
index cb950ca..9edf2cd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -357,18 +357,18 @@ debug@2.3.3:
   dependencies:
     ms "0.7.2"
 
-debug@2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.0.tgz#bc596bcabe7617f11d9fa15361eded5608b8499b"
-  dependencies:
-    ms "0.7.2"
-
 debug@2.6.7, debug@^2.2.0, debug@~2.6.4, debug@~2.6.6:
   version "2.6.7"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.7.tgz#92bad1f6d05bbb6bba22cca88bcd0ec894c2861e"
   dependencies:
     ms "2.0.0"
 
+debug@2.6.8:
+  version "2.6.8"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
+  dependencies:
+    ms "2.0.0"
+
 deep-extend@~0.4.0:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.4.2.tgz#48b699c27e334bf89f10892be432f6e4c7d34a7f"
@@ -840,6 +840,10 @@ hawk@~3.1.3:
     hoek "2.x.x"
     sntp "1.x.x"
 
+he@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
+
 hoek@2.x.x:
   version "2.16.3"
   resolved "https://registry.yarnpkg.com/hoek/-/hoek-2.16.3.tgz#20bb7403d3cea398e91dc4710a8ff1b8274a25ed"
@@ -1284,17 +1288,18 @@ mkdirp@0.5.1, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
-mocha@3.4.2:
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-3.4.2.tgz#d0ef4d332126dbf18d0d640c9b382dd48be97594"
+mocha@3.5.3:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-3.5.3.tgz#1e0480fe36d2da5858d1eb6acc38418b26eaa20d"
   dependencies:
     browser-stdout "1.3.0"
     commander "2.9.0"
-    debug "2.6.0"
+    debug "2.6.8"
     diff "3.2.0"
     escape-string-regexp "1.0.5"
     glob "7.1.1"
     growl "1.9.2"
+    he "1.1.1"
     json3 "3.3.2"
     lodash.create "3.1.1"
     mkdirp "0.5.1"