diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c4f7c92..ad0554f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -58,6 +58,7 @@ jobs:
         with:
           repository: "phpstan/build-cs"
           path: "build-cs"
+          ref: "1.x"
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
diff --git a/Makefile b/Makefile
index ecd8cfb..b01b153 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ lint:
 .PHONY: cs-install
 cs-install:
 	git clone https://github.com/phpstan/build-cs.git || true
-	git -C build-cs fetch origin && git -C build-cs reset --hard origin/main
+	git -C build-cs fetch origin && git -C build-cs reset --hard origin/1.x
 	composer install --working-dir build-cs
 
 .PHONY: cs