diff --git a/package.json b/package.json
index 4a82de56e19..c05be7b4dd2 100644
--- a/package.json
+++ b/package.json
@@ -52,15 +52,15 @@
   ],
   "devDependencies": {
     "@babel/preset-env": "^7.10.4",
-    "autoprefixer": "^9.8.4",
+    "autoprefixer": "^10.0.0",
     "babel-eslint": "^10.1.0",
     "babel-loader": "8.1.0",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "bundlesize": "^0.18.0",
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^6.0.3",
-    "css-loader": "^3.6.0",
-    "cssnano": "^4.1.10",
+    "css-loader": "^5.0.0",
+    "cssnano": "^5.0.0",
     "depcheck": "^1.0.0",
     "dojo-util": "1.16.3",
     "dojo-webpack-loader": "^0.9.2",