diff --git a/package.json b/package.json
index 05356c4..5fa3019 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
     "mocha": "^5.0.0",
     "rollup": "^0.57.1",
     "rollup-plugin-babel": "^3.0.3",
-    "rollup-plugin-commonjs": "^8.3.0",
+    "rollup-plugin-commonjs": "^9.0.0",
     "rollup-plugin-node-resolve": "^3.0.2",
     "rollup-plugin-uglify": "^3.0.0",
     "sinon": "^5.0.0"