diff --git a/package.json b/package.json
index 27292a5..7e75bc6 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,8 @@
   "dependencies": {
     "ansi-styles": "^2.1.0",
     "escape-string-regexp": "^1.0.2",
-    "supports-color": "^3.1.2"
+    "supports-color": "^3.1.2",
+    "forkeys": "^1.0.0"
   },
   "devDependencies": {
     "coveralls": "^2.11.2",