diff --git a/package.json b/package.json
index f0144aa..318a899 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "pre-commit": "~1.2.0"
   },
   "dependencies": {
-    "convert-source-map": "~1.3.0",
+    "convert-source-map": "~1.4.0",
     "css": "~2.2.1",
     "demolish": "1.0.x",
     "dollars": "0.0.x",