diff --git a/package.json b/package.json
index a59f82b..a6142dc 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "eslint-plugin-import": "^2.18.2",
     "mocha": "^6.0.0",
     "nyc": "^14.0.0",
-    "rollup": "^1.0.0",
+    "rollup": "^1.21.0",
     "rollup-plugin-babel": "^4.0.2"
   }
 }