diff --git a/package.json b/package.json
index b30039576ca..49084b2707f 100644
--- a/package.json
+++ b/package.json
@@ -67,8 +67,8 @@
     "@ckeditor/ckeditor5-dev-tests": "^13.0.0",
     "@ckeditor/ckeditor5-dev-utils": "^11.0.0",
     "@ckeditor/ckeditor5-dev-webpack-plugin": "^7.0.0",
-    "css-loader": "^0.28.11",
-    "eslint": "^4.15.0",
+    "css-loader": "^1.0.0",
+    "eslint": "^5.5.0",
     "eslint-config-ckeditor5": "^1.0.7",
     "glob": "^7.1.2",
     "husky": "^0.14.3",
@@ -77,9 +77,9 @@
     "mgit2": "^0.8.0",
     "mini-css-extract-plugin": "^0.4.0",
     "minimatch": "^3.0.4",
-    "postcss-loader": "^2.1.5",
+    "postcss-loader": "^3.0.0",
     "raw-loader": "^0.5.1",
-    "style-loader": "^0.21.0",
+    "style-loader": "^0.23.0",
     "uglifyjs-webpack-plugin": "^1.2.7",
     "umberto": "^0.7.0",
     "webpack": "^4.15.0"