diff --git a/package.json b/package.json
index 22ab89a..51e8b2a 100644
--- a/package.json
+++ b/package.json
@@ -34,17 +34,17 @@
   "devDependencies": {
     "bannerjs": "1.0.5",
     "chai": "4.1.2",
-    "karma": "^2.0.4",
+    "karma": "2.0.4",
     "karma-chai": "0.1.0",
-    "karma-chrome-launcher": "^2.2.0",
-    "karma-firefox-launcher": "^1.0.1",
+    "karma-chrome-launcher": "2.2.0",
+    "karma-firefox-launcher": "1.1.0",
     "karma-mocha": "1.3.0",
-    "karma-webpack": "^2.0.8",
-    "mocha": "^5.2.0",
+    "karma-webpack": "2.0.13",
+    "mocha": "5.2.0",
     "onchange": "3.2.1",
     "sync-exec": "0.6.2",
     "uglify-js": "3.3.10",
     "umd": "3.0.1",
-    "webpack": "^1.13.0"
+    "webpack": "1.15.0"
   }
 }