diff --git a/package.json b/package.json
index 3259b57..2312671 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   },
   "devDependencies": {
     "better-es5-shim": "^0.1.0",
-    "es5-shim": "^4.5.9",
+    "es5-shim": "^4.5.12",
     "istanbul": "^0.4.5",
     "istanbul-coveralls": "^1.0.3",
     "mocha": "~5.1.0",