diff --git a/package.json b/package.json
index 9ef8fa3..7cbf4f8 100644
--- a/package.json
+++ b/package.json
@@ -62,8 +62,8 @@
     "async": "^1.5.2",
     "babel-core": "^6.4.5",
     "babel-loader": "^6.2.1",
-    "babel-preset-es2015": "^6.3.13",
-    "babel-register": "^6.4.3",
+    "babel-preset-es2015": "^6.6.0",
+    "babel-register": "^6.6.0",
     "chai": "^3.4.1",
     "del": "^2.2.0",
     "eslint-config-google": "^0.3.0",