diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b468350..59850b3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,17 +10,17 @@ jobs:
   Analysis:
     strategy:
       matrix:
-        php-versions: ['8.3']
+        php-versions: ['8.5']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Validate composer.json and composer.lock
         run: composer validate
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@accd6127cb78bee3e8082180cb391013d204ef9f # v2.3.0
         with:
           php-version: ${{ matrix.php-versions }}
           ini-values: post_max_size=256M, log_errors=1
@@ -33,7 +33,7 @@ jobs:
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Cache dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
@@ -43,7 +43,6 @@ jobs:
         run: composer install --prefer-dist --no-progress --no-suggest
 
       - name: Coding Guidelines
-        if: matrix.php-versions != '8.0'
         run: composer test:lint
 
       - name: Static Analyzer (PHPStan)
@@ -52,17 +51,17 @@ jobs:
   Tests:
     strategy:
       matrix:
-        php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4']
+        php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Validate composer.json and composer.lock
         run: composer validate
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@accd6127cb78bee3e8082180cb391013d204ef9f # v2.3.0
         with:
           php-version: ${{ matrix.php-versions }}
           ini-values: post_max_size=256M, log_errors=1
@@ -75,7 +74,7 @@ jobs:
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Cache dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
diff --git a/composer.json b/composer.json
index cdb1b93..1742916 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5|^9.5",
-        "phpstan/phpstan": "^1.0.0",
+        "phpstan/phpstan": "^2.0.0",
         "infection/infection": "<1.0"
     },
     "autoload": {
diff --git a/tools/php-cs-fixer.phar b/tools/php-cs-fixer.phar
index 49bbf89..333626f 100755
Binary files a/tools/php-cs-fixer.phar and b/tools/php-cs-fixer.phar differ