diff --git a/package.json b/package.json
index d32afe8d..8e4c70d5 100644
--- a/package.json
+++ b/package.json
@@ -19,8 +19,8 @@
     "babel-plugin-transform-es3-property-literals": "^6.3.13",
     "babel-plugin-transform-object-rest-spread": "^6.1.18",
     "babel-polyfill": "^6.3.14",
-    "babel-preset-es2015": "^6.1.18",
-    "babel-preset-es2015-rollup": "^1.1.1",
+    "babel-preset-es2015": "6.1.18",
+    "babel-preset-es2015-rollup": "1.1.1",
     "babel-register": "^6.2.0",
     "cldr-cal-buddhist-full": "28.0.0",
     "cldr-cal-chinese-full": "28.0.0",