diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index da528d2..fc04bdf 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,10 +1,10 @@
 name: Tests
 
 on:
-    push:
+    push: master
     pull_request:
     schedule:
-        - cron:  '0 1 * * *'
+        - cron:  '0 1 0 * *'
 
 jobs:
     test:
@@ -12,6 +12,7 @@ jobs:
         strategy:
             matrix:
                 php: [ '8.1', '8.2', '8.3' ]
+                phpstan: [ '^1.0', '^2.0' ]
         steps:
             - uses: actions/checkout@v4
             - name: Setup PHP with tools
@@ -19,7 +20,7 @@ jobs:
               with:
                   php-version: ${{ matrix.php }}
                   tools: composer
-            - run: composer install
+            - run: composer require phpstan/phpstan ${{ matrix.phpstan }}
             - run: composer test
 
     format:
@@ -42,6 +43,7 @@ jobs:
         strategy:
             matrix:
                 php: [ '8.1' ]
+                phpstan: [ '^1.0', '^2.0' ]
         steps:
             - uses: actions/checkout@v4
             - name: Setup PHP with tools
@@ -49,5 +51,5 @@ jobs:
               with:
                   php-version: ${{ matrix.php }}
                   tools: composer
-            - run: composer install
+            - run: composer require phpstan/phpstan ${{ matrix.phpstan }}
             - run: composer analyse