diff --git a/package.json b/package.json
index c061217..8500c43 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
   },
   "dependencies": {
     "debug": "^2.2.0",
+    "semver": "^5.3.0",
     "streamroller": "^0.1.0"
   },
   "devDependencies": {