diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 4099119..b36c58b 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -29,19 +29,29 @@ jobs:
           tools: composer:v2
 
 
-      - name: Validate composer.json
-        run: composer validate --strict --no-check-lock
+      - name: Validate Composer metadata
+        run: |
+          if [ -f composer.lock ]; then
+            composer validate --strict --no-interaction
+          else
+            composer validate --strict --no-check-lock --no-interaction
+          fi
 
       - name: Cache Composer packages
         uses: actions/cache@v4
         with:
           path: vendor
-          key: ${{ runner.os }}-composer-${{ matrix.php-versions }}-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ matrix.php-versions }}-${{ hashFiles('**/composer.json', '**/composer.lock') }}
           restore-keys: |
             ${{ runner.os }}-composer-${{ matrix.php-versions }}-
 
       - name: Install dependencies
-        run: composer update --prefer-dist --no-progress --ignore-platform-req="ext-*"
+        run: |
+          if [ -f composer.lock ]; then
+            composer install --prefer-dist --no-progress --no-interaction
+          else
+            composer update --prefer-dist --no-progress --no-interaction
+          fi
 
       - name: Run phpspec
         run: vendor/bin/phpspec run --config phpspec.yml.dist
diff --git a/composer.json b/composer.json
index 3718b99..774fe68 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "docs": "https://portphp.readthedocs.org"
     },
     "require": {
-        "php": ">=5.6.0",
+        "php": "^8.2",
         "portphp/portphp": "^1.0.0",
         "seld/signal-handler": "^1.0 || ^2.0",
         "symfony/property-access": "^2.3 || ^3.0 || ^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0",