diff --git a/.github/workflows/php-ci.yml b/.github/workflows/php-ci.yml
index 1cc55c0..171038a 100644
--- a/.github/workflows/php-ci.yml
+++ b/.github/workflows/php-ci.yml
@@ -6,16 +6,19 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   phpstan:
     runs-on: ubuntu-latest
 
     name: PHPStan - FOSSBilling Preview
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
-      - name: Checkout FOSSBilling Source Code
-        uses: actions/checkout@v3
+      - name: Checkout FOSSBilling
+        uses: actions/checkout@v6
         with:
           repository: "FOSSBilling/FOSSBilling"
           path: "FOSSBilling"
@@ -25,11 +28,14 @@ jobs:
         with:
           args: --working-dir=FOSSBilling
           dev: no
+          php_version: 8.3
+          php_extensions: intl
 
       - name: Run PHPStan
         uses: php-actions/phpstan@v3
         with:
-          php_version: latest
+          version: latest
+          php_version: 8.3
           configuration: phpstan.neon
           memory_limit: 512M
 
@@ -38,17 +44,17 @@ jobs:
 
     name: PHPStan - FOSSBilling Release
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
-      - name: Get the Latest FOSSBilling Release Tag
+      - name: Get Latest FOSSBilling Release Tag
         uses: oprypin/find-latest-tag@v1
         with:
           repository: "FOSSBilling/FOSSBilling"
           releases-only: true
         id: get_id
 
-      - name: Checkout The Release tag
-        uses: actions/checkout@v3
+      - name: Checkout Release tag
+        uses: actions/checkout@v6
         with:
           repository: "FOSSBilling/FOSSBilling"
           path: "FOSSBilling"
@@ -57,12 +63,15 @@ jobs:
       - name: Install Composer Dependencies
         uses: php-actions/composer@v6
         with:
-          args: --working-dir=FOSSBilling/
+          args: --working-dir=FOSSBilling
           dev: no
+          php_version: 8.3
+          php_extensions: intl
 
       - name: Run PHPStan
         uses: php-actions/phpstan@v3
         with:
-          php_version: latest
+          version: latest
+          php_version: 8.3
           configuration: phpstan.neon
           memory_limit: 512M