diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f03d8b8..431c1d6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,7 +35,7 @@ jobs:
         run: |
           composer require --dev 'phpunit/phpunit:^4.8.36 || ^5.7.21 || ^6 || ^7' --no-update
           sed -i 's/: void//g' tests/*.php
-          composer remove phpstan/phpstan --no-update
+          composer remove --dev phpstan/phpstan --no-update
 
       - name: Install dependencies
         run: composer install --prefer-dist --no-interaction --no-progress