diff --git a/package.json b/package.json
index 5130496..a000e95 100644
--- a/package.json
+++ b/package.json
@@ -30,10 +30,10 @@
     "coveralls": "jscoverage lib && LIB_COV=1 nodeunit --reporter=lcov test | coveralls"
   },
   "devDependencies": {
-    "bluebird": "~2.2.2",
-    "coveralls": "^2.11.2",
-    "jscoverage": "^0.5.9",
-    "nodeunit": "^0.9.0"
+    "bluebird": "2.2.2",
+    "coveralls": "2.11.2",
+    "jscoverage": "0.5.9",
+    "nodeunit": "0.9.0"
   },
   "keywords": [
     "functional",