diff --git a/package.json b/package.json
index b466e76..2ae5c34 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "passport-http": "0.3.0",
     "passport-local": "1.0.0",
     "redis": "2.8.0",
-    "underscore.string": "^3.0.0"
+    "underscore.string": "3.3.4"
   },
   "devDependencies": {
     "chai": "^4.0.0",