diff --git a/package.json b/package.json
index e5c735f..b206d92 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
   "devDependencies": {
     "babel-cli": "6",
     "babel-core": "6",
-    "babel-preset-es2015": "6",
+    "babel-preset-es2015": "6.9.0",
     "benchmark": "2",
     "finalhandler": "0",
     "isparta": "4",