diff --git a/package-lock.json b/package-lock.json
index 3da8c1f..8505003 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -834,6 +834,12 @@
         "wordwrap": "0.0.2"
       }
     },
+    "coffeescript": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/coffeescript/-/coffeescript-2.6.1.tgz",
+      "integrity": "sha512-GG5nkF93qII8HmHqnnibkgpp/SV7PSnSPiWsbinwya7nNOe95aE/x2xrKZJFks8Qpko3TNrC+/LahaKgrz5YCg==",
+      "dev": true
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
diff --git a/package.json b/package.json
index f6e1480..3121c22 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,7 @@
   },
   "devDependencies": {
     "browserify": "~14.0.0",
+    "coffeescript": "^2.6.1",
     "grunt": "~1.3.0",
     "grunt-browserify": "~5.0.0",
     "grunt-bump": "0.8.0",