diff --git a/.github/workflows/pull-request-check.yml b/.github/workflows/pull-request-check.yml
index c1110c52..f41a2b74 100644
--- a/.github/workflows/pull-request-check.yml
+++ b/.github/workflows/pull-request-check.yml
@@ -12,7 +12,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@f3e473d116dcccaddc5834248c87452386958240 # v2
         with:
-          php-version: '8.3.29'
+          php-version: '8.4.23'
           tools: composer
           coverage: none
 
@@ -30,44 +30,6 @@ jobs:
       - name: Running unit test
         run: vendor/bin/phpunit --configuration phpunit.xml
 
-  php84-syntax-check:
-    name: PHP 8.4 syntax compatibility
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@a37ce9120846195fa4ece8f58b268e6043cb2f26 # v3.6.0
-        with:
-          fetch-depth: 0
-
-      - name: Setup PHP 8.4
-        uses: shivammathur/setup-php@f3e473d116dcccaddc5834248c87452386958240 # v2
-        with:
-          php-version: '8.4'
-          tools: composer
-          coverage: none
-
-      - name: Cache Composer dependencies
-        uses: actions/cache@6f8efc29b200d32929f49075959781ed54ec270c # v3.4.3
-        with:
-          path: /tmp/composer-cache
-          key: ${{ runner.os }}-${{ hashFiles('composer.lock') }}
-
-      - name: Install dependencies
-        env:
-          COMPOSER_CACHE_DIR: /tmp/composer-cache
-        run: composer install --no-interaction --no-progress --prefer-dist
-
-      - name: Run Rector dry-run on changed PHP files
-        run: |
-          CHANGED=$(git diff --name-only origin/${{ github.base_ref }}...HEAD -- '*.php')
-          if [ -z "$CHANGED" ]; then
-            echo "No PHP files changed."
-            exit 0
-          fi
-          echo "Changed PHP files:"
-          echo "$CHANGED"
-          vendor/bin/rector process --dry-run --no-progress-bar $CHANGED
-
   convergence-ratchet:
     name: Convergence ratchet (no new 4.2-only patterns)
     runs-on: ubuntu-latest
diff --git a/composer.json b/composer.json
index a6632458..2d2b95d1 100755
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": ">=8.3.29",
+        "php": ">=8.4.23",
         "d11wtq/boris": "~1.0",
         "filp/whoops": "~2.11",
         "ircmaxell/password-compat": "~1.0",