diff --git a/package.json b/package.json
index 78ac9e2..05a9db1 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
     "mocha": "^5.0.0",
     "node-sass": "^4.5.2",
     "offline-plugin": "^5.0.1",
-    "postcss-loader": "^2.0.5",
+    "postcss-loader": "^3.0.0",
     "sass-loader": "^7.0.0",
     "script-ext-html-webpack-plugin": "^2.0.0",
     "sinon": "^6.0.0",