diff --git a/package.json b/package.json
index e3b6c61537e..7d9bfa08138 100644
--- a/package.json
+++ b/package.json
@@ -146,7 +146,6 @@
     "postchangelog": "node ./scripts/release/update-utils-version.js",
     "release:bump-version": "node ./scripts/release/bump-versions.js",
     "release:publish": "node ./scripts/release/publish.js",
-    "release:stable-branches": "bash ./scripts/update-stable-branches.sh",
     "switch-to-dev-dev": "sh ./scripts/switch-to-dev-dev.sh",
     "clean-up-svg-icons": "sh ./scripts/clean-up-svg-icons.sh"
   },
diff --git a/scripts/update-stable-branches.sh b/scripts/update-stable-branches.sh
deleted file mode 100755
index 4522987eef9..00000000000
--- a/scripts/update-stable-branches.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-
-# @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
-# For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
-
-set -e
-
-read -p "Are you sure? " -n 1 -r
-echo ""
-
-if [[ $REPLY =~ ^[Yy]$ ]]
-then
-	# Update the `stable` branch in the `ckeditor5` repository.
-	git checkout stable && git merge master && git checkout master
-
-	# Push the `#stable` branch.
-	git push origin stable master
-
-	echo "Success! 🎂"
-fi