diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0eeccf7..bc9162b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,13 +7,16 @@ on:
 
 jobs:
   phpunit:
-    name: Tests (PHPUnit)
+    name: Tests (PHPUnit) L${{ matrix.laravel }}
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        laravel: [8, 9]
 
     steps:
     - uses: actions/checkout@v2
     - name: Install composer dependencies
-      run: composer install
+      run: composer require "laravel/framework:^${{matrix.laravel}}.0"
     - name: Run tests
       run: vendor/bin/phpunit
 
diff --git a/composer.json b/composer.json
index 43b2a39..c2487c7 100644
--- a/composer.json
+++ b/composer.json
@@ -25,5 +25,7 @@
     },
     "require-dev": {
         "orchestra/testbench": "^6.9|^7.0"
-    }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }