diff --git a/package.json b/package.json
index 519af9a..572dc0e 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "ava": "^0.21.0",
     "browser-env": "^3.0.0",
     "colormap": "^2.2.0",
-    "core-js": "^2.4.1",
+    "core-js": "^2.5.0",
     "dependency-check": "^2.7.0",
     "eslint": "^4.0.0",
     "eslint-config-unional": "^0.2.3",