diff --git a/package.json b/package.json
index c4050c3..060b634 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "tweetnacl": "^1.0.0",
     "uglifyjs-webpack-plugin": "^1.2.7",
     "webpack-merge": "^4.1.3",
-    "webpack-sources": "^1.1.0"
+    "webpack-sources": "1.2.0"
   },
   "keywords": [
     "bigchaindb",