diff --git a/package.json b/package.json
index e6ee205..5971fe6 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "chai": "~4.1.0",
-    "chalk": "~2.4.0",
+    "chalk": "~4.0.0",
     "coveralls": "~3.0.0",
     "eslint": "~4.19.0",
     "istanbul": "~0.4.5",