diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index c161a0d..af43cc9 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -18,7 +18,7 @@ jobs:
         include:
           # Run "no Twig" build on latest PHP and Symfony LTS
           - php: '8.2'
-            symfony: '5.4.*'
+            symfony: '6.4.*@dev'
             composer-flags: '--prefer-stable'
             can-fail: false
             with-twig: false
@@ -27,6 +27,16 @@ jobs:
             composer-flags: '--prefer-stable --prefer-lowest'
             can-fail: false
             with-twig: true
+          - php: '8.2'
+            symfony: '6.4.*@dev'
+            composer-flags: '--prefer-stable'
+            can-fail: true
+            with-twig: true
+          - php: '8.2'
+            symfony: '7.0.*@dev'
+            composer-flags: '--prefer-stable'
+            can-fail: true
+            with-twig: true
 
     name: "PHP ${{ matrix.php }}${{ matrix.pagerfanta != '' && format(' - Pagerfanta {0}', matrix.pagerfanta) || '' }}${{ matrix.with-twig == false && ' - Without Twig' || '' }} - Symfony ${{ matrix.symfony }}${{ matrix.composer-flags != '' && format(' - Composer {0}', matrix.composer-flags) || '' }}"
 
diff --git a/composer.json b/composer.json
index c4e260b..769c2c3 100644
--- a/composer.json
+++ b/composer.json
@@ -8,12 +8,12 @@
         "php": "^8.1",
         "pagerfanta/core": "^3.7 || ^4.0",
         "psr/container": "^1.0 || ^2.0",
-        "symfony/config": "^5.4 || ^6.2",
-        "symfony/dependency-injection": "^5.4 || ^6.2",
-        "symfony/http-foundation": "^5.4 || ^6.2",
-        "symfony/http-kernel": "^5.4 || ^6.2",
-        "symfony/property-access": "^5.4 || ^6.2",
-        "symfony/routing": "^5.4 || ^6.2"
+        "symfony/config": "^5.4 || ^6.3 || ^7.0",
+        "symfony/dependency-injection": "^5.4 || ^6.3 || ^7.0",
+        "symfony/http-foundation": "^5.4 || ^6.3 || ^7.0",
+        "symfony/http-kernel": "^5.4 || ^6.3 || ^7.0",
+        "symfony/property-access": "^5.4 || ^6.3 || ^7.0",
+        "symfony/routing": "^5.4 || ^6.3 || ^7.0"
     },
     "require-dev": {
         "jms/serializer": "^3.18",
@@ -25,21 +25,21 @@
         "phpstan/phpstan-phpunit": "1.3.14",
         "phpstan/phpstan-symfony": "1.3.2",
         "phpunit/phpunit": "9.6.12",
-        "symfony/phpunit-bridge": "^5.4 || ^6.2",
-        "symfony/serializer": "^5.4 || ^6.2",
-        "symfony/twig-bridge": "^5.4 || ^6.2",
-        "symfony/twig-bundle": "^5.4 || ^6.2",
-        "symfony/translation": "^5.4 || ^6.2",
+        "symfony/phpunit-bridge": "^5.4 || ^6.3 || ^7.0",
+        "symfony/serializer": "^5.4 || ^6.3 || ^7.0",
+        "symfony/twig-bridge": "^5.4 || ^6.3 || ^7.0",
+        "symfony/twig-bundle": "^5.4 || ^6.3 || ^7.0",
+        "symfony/translation": "^5.4 || ^6.3 || ^7.0",
         "twig/twig": "^2.13 || ^3.0"
     },
     "conflict": {
         "jms/serializer": "<3.18",
         "jms/serializer-bundle": "<4.2",
         "pagerfanta/twig": "<3.7",
-        "symfony/serializer": "<5.4 || >=6.0,<6.2",
-        "symfony/translation": "<5.4 || >=6.0,<6.2",
-        "symfony/twig-bridge": "<5.4 || >=6.0,<6.2",
-        "symfony/twig-bundle": "<5.4 || >=6.0,<6.2",
+        "symfony/serializer": "<5.4 || >=6.0,<6.3",
+        "symfony/translation": "<5.4 || >=6.0,<6.3",
+        "symfony/twig-bridge": "<5.4 || >=6.0,<6.3",
+        "symfony/twig-bundle": "<5.4 || >=6.0,<6.3",
         "twig/twig": "<2.13",
         "white-october/pagerfanta-bundle": "*"
     },
diff --git a/src/BabDevPagerfantaBundle.php b/src/BabDevPagerfantaBundle.php
index 05d88ed..da17d03 100644
--- a/src/BabDevPagerfantaBundle.php
+++ b/src/BabDevPagerfantaBundle.php
@@ -21,7 +21,7 @@ public function build(ContainerBuilder $container): void
 
     public function getContainerExtension(): ?ExtensionInterface
     {
-        if (null === $this->extension) {
+        if (!isset($this->extension)) {
             $this->extension = new BabDevPagerfantaExtension();
         }
 
diff --git a/tests/Serializer/Normalizer/PagerfantaNormalizerTest.php b/tests/Serializer/Normalizer/PagerfantaNormalizerTest.php
index 13412dd..cac7adc 100644
--- a/tests/Serializer/Normalizer/PagerfantaNormalizerTest.php
+++ b/tests/Serializer/Normalizer/PagerfantaNormalizerTest.php
@@ -10,6 +10,7 @@
 use Pagerfanta\PagerfantaInterface;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Normalizer\CacheableSupportsMethodInterface;
 use Symfony\Component\Serializer\Serializer;
 
 final class PagerfantaNormalizerTest extends TestCase
@@ -42,6 +43,10 @@ public function testNormalize(): void
      */
     public function testNormalizeWithLegacyDecorator(): void
     {
+        if (!interface_exists(CacheableSupportsMethodInterface::class)) {
+            self::markTestSkipped('Test requires symfony/serializer:<6.4');
+        }
+
         $pager = new Pagerfanta(
             new NullAdapter(25),
         );
@@ -90,6 +95,10 @@ public function testSupportsNormalization(mixed $data, bool $supported): void
      */
     public function testHasCacheableSupportsMethod(): void
     {
+        if (!interface_exists(CacheableSupportsMethodInterface::class)) {
+            self::markTestSkipped('Test requires symfony/serializer:<6.4');
+        }
+
         self::assertTrue((new LegacyPagerfantaNormalizer(new PagerfantaNormalizer()))->hasCacheableSupportsMethod());
     }