diff --git a/ckeditor5/node_modules/webpack-sources/package.json b/ckeditor5/node_modules/webpack-sources/package.json
index e15a5a1..3f96b57 100644
--- a/ckeditor5/node_modules/webpack-sources/package.json
+++ b/ckeditor5/node_modules/webpack-sources/package.json
@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "source-list-map": "^2.0.0",
-    "source-map": "~0.6.1"
+    "source-map": "~0.7.6"
   },
   "devDependencies": {
     "beautify-lint": "^1.0.3",