diff --git a/package.json b/package.json
index 20a623a..0877661 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "rimraf": "^2.5.0",
     "rollup": "^0.35.7",
     "rollup-plugin-babel": "^2.6.0",
-    "rollup-plugin-sourcemaps": "^0.3.1",
+    "rollup-plugin-sourcemaps": "^0.4.0",
     "typescript": "^1.8.10"
   }
 }