diff --git a/.github/workflows/build_scoped_rector_php70.yaml b/.github/workflows/build_scoped_rector_php70.yaml
index 7f1092e84d0..d82eeffb9f4 100644
--- a/.github/workflows/build_scoped_rector_php70.yaml
+++ b/.github/workflows/build_scoped_rector_php70.yaml
@@ -37,6 +37,7 @@ jobs:
                     composer remove symplify/easy-coding-standard --dev
                     composer remove symplify/coding-standard --dev --update-with-dependencies
                     composer remove friendsofphp/php-cs-fixer --dev --update-with-dependencies
+                    rm composer.lock
                     composer config repositories.phpstan/phpstan-src vcs https://github.com/phpstan/phpstan-src
                     composer require phpstan/phpstan-src:0.12.85
                     composer require composer/composer