diff --git a/package.json b/package.json
index a4afcb5..68925af 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "mocha": "^5.0.0",
     "nyc": "^11.0.1",
     "postcss": "^6.0.7",
-    "postcss-modules": "^1.0.0",
+    "postcss-modules": "^2.0.0",
     "sinon": "^4.0.1",
     "sinon-chai": "^2.8.0",
     "string-hash": "^1.1.1"