diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4d18909..bac6b77 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,17 +10,26 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '7.2', '7.3', '7.4', '8.0' ]
+        php: [ '8.0', '8.1' ]
         strategy: [ 'highest' ]
-        sf_version: ['']
+        sf_version: ['5.*', '6.*']
         include:
-          - php: 7.4
-            strategy: 'lowest'
-          - php: 7.3
-            sf_version: '3.*'
-          - php: 7.3
-            sf_version: '4.*'
-
+            - php: 7.2
+              sf_version: '4.*'
+            - php: 7.3
+              sf_version: '3.*'
+            - php: 7.3
+              sf_version: '4.*'
+            - php: 7.3
+              sf_version: '5.*' 
+            - php: 7.4
+              strategy: 'lowest'
+            - php: 7.4
+              sf_version: '4.*'
+            - php: 7.4
+              sf_version: '5.*'
+            - php: 8.1
+              strategy: 'lowest'
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
diff --git a/composer.json b/composer.json
index f755d25..03c6aa4 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^4.3 || ^5.0 || ^6.0",
-        "phpunit/phpunit": "^8.4"
+        "phpunit/phpunit": ">=8.5.23"
     },
     "autoload": {
         "psr-4": {