diff --git a/.github/workflows/code_checks.yaml b/.github/workflows/code_checks.yaml
index 776cdf9..f56d708 100644
--- a/.github/workflows/code_checks.yaml
+++ b/.github/workflows/code_checks.yaml
@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['7.3', '7.4', '8.0', '8.1', '8.2']
+        php: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
       fail-fast: false
     name: PHPUnit (PHP ${{ matrix.php }})
     steps:
 
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
diff --git a/README.md b/README.md
index ad346ed..129c4dc 100644
--- a/README.md
+++ b/README.md
@@ -326,7 +326,6 @@ class ConvertPaymentExtension implements ExtensionInterface
         $request->setResult((array) $result);
     }
 }
-
 ```
 
 ### Additional Configuration