diff --git a/.github/workflows/verify-stability.yaml b/.github/workflows/verify-stability.yaml
index d68d836..92b9a25 100644
--- a/.github/workflows/verify-stability.yaml
+++ b/.github/workflows/verify-stability.yaml
@@ -1,58 +1,111 @@
 name: Verify stability
-run-name: ${{ github.actor }} is verifying stability
-on: [ push ]
-#on:
-#    push:
-#        branches: [ master, develop ]
-#    pull_request:
-#        branches: [ master, develop ]
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
-    contents: read
+  contents: read
+
 jobs:
-    tests:
-        runs-on: ubuntu-latest
-        strategy:
-            matrix:
-                php-versions: [ '8.0', '8.1', '8.2' ]
-        steps:
-            -   name: Hello
-                run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
-            -   name: Setup PHP
-                uses: shivammathur/setup-php@v2
-                with:
-                    php-version: ${{ matrix.php-versions }}
-                    extensions: dom, fileinfo, intl-72.1, json, pcre, simplexml
-            -   name: Install locales
-                run: |
-                    sudo apt-get update \
-                    && sudo apt-get install -y --no-install-recommends --fix-missing \
-                        locales
-            -   name: Generate locales
-                run: |
-                    sudo sed -i "s/^# de_DE/de_DE/g; \
-                        s/^# es_ES/es_ES/g; \
-                        s/^# en_GB/en_GB/g; \
-                        s/^# en_US/en_US/g; \
-                        s/^# fr_FR/fr_FR/g; \
-                        s/^# it_IT/it_IT/g; \
-                        s/^# pl_PL/pl_PL/g; \
-                        s/^# ru_RU/ru_RU/g;" /etc/locale.gen \
-                    && sudo locale-gen
-            -   name: Checkout branch
-                uses: actions/checkout@v3
-            -   name: Validate composer.json and composer.lock
-                run: composer validate --strict
-            -   name: Cache Composer packages
-                id: composer-cache
-                uses: actions/cache@v3
-                with:
-                    path: vendor
-                    key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
-                    restore-keys: |
-                        ${{ runner.os }}-php-
-            -   name: Install Composer dependencies
-                run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress --no-plugins --prefer-dist
-            -   name: Run PHPUnit tests
-                run: vendor/bin/phpunit --no-coverage
-            -   name: Bye 👋
-                run: echo "🍏 This job's status is ${{ job.status }}."
+  validate:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '8.0', '8.1', '8.2' ]
+    env:
+      extensions: dom, fileinfo, intl, json, pcre, simplexml
+      key: cache-v1 # can be any string, change to clear the extension cache.
+    steps:
+      - name: Hello
+        run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
+      - name: Checkout branch
+        uses: actions/checkout@v4
+      - name: Setup cache environment
+        id: extcache
+        uses: shivammathur/cache-extensions@v1
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: ${{ env.extensions }}
+          key: ${{ env.key }}
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: ${{ env.extensions }}
+      - name: Validate Composer (composer.json and composer.lock)
+        uses: php-actions/composer@v6
+        with:
+          php_version: ${{ matrix.php-versions }}
+          php_extensions: intl
+          command: validate --strict --no-check-publish
+      - name: Cache Composer dependencies
+        id: composer-cache
+        uses: actions/cache@v4
+        with:
+          path: /tmp/composer-cache
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+      - name: Install Composer dependencies
+        uses: php-actions/composer@v6
+        with:
+          php_version: ${{ matrix.php-versions }}
+          php_extensions: intl
+          dev: no
+  phpunit:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '8.0', '8.1', '8.2' ]
+    env:
+      extensions: dom, fileinfo, intl, json, pcre, simplexml
+      key: cache-v1 # can be any string, change to clear the extension cache.
+    needs: [ validate ]
+    if: needs.validate.result == 'success'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup cache environment
+        id: extcache
+        uses: shivammathur/cache-extensions@v1
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: ${{ env.extensions }}
+          key: ${{ env.key }}
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: ${{ env.extensions }}
+      - name: Install locales
+        run: |
+          sudo apt-get update \
+          && sudo apt-get install -y --no-install-recommends --fix-missing \
+              locales
+      - name: Generate locales
+        run: |
+          sudo sed -i "s/^# de_DE/de_DE/g; \
+              s/^# es_ES/es_ES/g; \
+              s/^# en_GB/en_GB/g; \
+              s/^# en_US/en_US/g; \
+              s/^# fr_FR/fr_FR/g; \
+              s/^# it_IT/it_IT/g; \
+              s/^# pl_PL/pl_PL/g; \
+              s/^# ru_RU/ru_RU/g;" /etc/locale.gen \
+          && sudo locale-gen
+      - name: Install Composer dependencies
+        uses: php-actions/composer@v6
+        with:
+          php_version: ${{ matrix.php-versions }}
+          php_extensions: intl
+      - name: Run PHPUnit tests
+        run: vendor/bin/phpunit --no-coverage
+      - name: Bye 👋
+        run: echo "🍏 This job's status is ${{ job.status }}."