diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8eb95ac5..3cf22229 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -17,8 +17,6 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.2"
-          - "7.3"
           - "7.4"
           - "8.0"
           - "8.1"
@@ -26,7 +24,7 @@ jobs:
         dependencies:
           - "highest"
         include:
-          - php-version: "7.2"
+          - php-version: "7.4"
             dependencies: "lowest"
 
     steps:
diff --git a/.phpcs.xml.dist b/.phpcs.xml.dist
index 73ddd005..a77e830e 100644
--- a/.phpcs.xml.dist
+++ b/.phpcs.xml.dist
@@ -10,7 +10,7 @@
     <arg name="colors"/>
     <arg value="nps"/>
 
-    <config name="php_version" value="70200"/>
+    <config name="php_version" value="70400"/>
 
     <file>Cache/</file>
     <file>ContextFactory/</file>
diff --git a/Cache/CacheWarmer.php b/Cache/CacheWarmer.php
index 372e7a90..c37fdcc9 100644
--- a/Cache/CacheWarmer.php
+++ b/Cache/CacheWarmer.php
@@ -38,7 +38,7 @@ public function __construct(array $includePaths, MetadataFactoryInterface $metad
      *
      * @return string[] A list of classes or files to preload on PHP 7.4+
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir): array
     {
         $finder = Finder::create()
             ->ignoreVCS(true)
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 173129a9..b3c896c6 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -25,10 +25,7 @@ public function __construct($debug = false)
         $this->debug = $debug;
     }
 
-    /**
-     * @return TreeBuilder
-     */
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $tb = new TreeBuilder('jms_serializer');
 
diff --git a/DependencyInjection/JMSSerializerExtension.php b/DependencyInjection/JMSSerializerExtension.php
index f301d6e1..75b72388 100644
--- a/DependencyInjection/JMSSerializerExtension.php
+++ b/DependencyInjection/JMSSerializerExtension.php
@@ -253,14 +253,10 @@ private function loadInternal(array $config, ScopedContainer $container, array $
             $container->removeDefinition('jms_serializer.metadata.doc_block_driver');
         }
 
-        // enable the typed props reader on php 7.4+
-        if (PHP_VERSION_ID >= 70400) {
-            $container->getDefinition('jms_serializer.metadata.typed_properties_driver')
-                ->setDecoratedService('jms_serializer.metadata_driver')
-                ->setPublic(false);
-        } else {
-            $container->removeDefinition('jms_serializer.metadata.typed_properties_driver');
-        }
+        // enable the typed props reader
+        $container->getDefinition('jms_serializer.metadata.typed_properties_driver')
+            ->setDecoratedService('jms_serializer.metadata_driver')
+            ->setPublic(false);
 
         if ($config['enum_support']) {
             $container->getDefinition('jms_serializer.metadata.enum_driver')
diff --git a/ExpressionLanguage/BasicSerializerFunctionsProvider.php b/ExpressionLanguage/BasicSerializerFunctionsProvider.php
index eff59a5f..9b58ebf9 100644
--- a/ExpressionLanguage/BasicSerializerFunctionsProvider.php
+++ b/ExpressionLanguage/BasicSerializerFunctionsProvider.php
@@ -12,7 +12,7 @@ class BasicSerializerFunctionsProvider implements ExpressionFunctionProviderInte
     /**
      * @return ExpressionFunction[]
      */
-    public function getFunctions()
+    public function getFunctions(): array
     {
         return [
             new ExpressionFunction('service', static function ($arg) {
diff --git a/Tests/DependencyInjection/JMSSerializerExtensionTest.php b/Tests/DependencyInjection/JMSSerializerExtensionTest.php
index 9631c1b9..56582111 100644
--- a/Tests/DependencyInjection/JMSSerializerExtensionTest.php
+++ b/Tests/DependencyInjection/JMSSerializerExtensionTest.php
@@ -32,7 +32,7 @@
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
-use Twig\Loader\ContainerRuntimeLoader;
+use Twig\RuntimeLoader\ContainerRuntimeLoader;
 
 class JMSSerializerExtensionTest extends TestCase
 {
@@ -777,10 +777,6 @@ public function testAutoconfigureHandlers()
 
     public function testTypedDriverIsEnabled()
     {
-        if (PHP_VERSION_ID < 70400) {
-            $this->markTestSkipped(sprintf('%s requires PHP 7.4', __METHOD__));
-        }
-
         if (!class_exists(TypedPropertiesDriver::class)) {
             $this->markTestSkipped(sprintf('%s requires %s', __METHOD__, TypedPropertiesDriver::class));
         }
diff --git a/composer.json b/composer.json
index 39a848ba..4378f7f1 100644
--- a/composer.json
+++ b/composer.json
@@ -21,29 +21,29 @@
         }
     ],
     "require": {
-        "php": "^7.2 || ^8.0",
+        "php": "^7.4 || ^8.0",
         "jms/serializer": "^3.28",
         "jms/metadata": "^2.6",
-        "symfony/dependency-injection": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/framework-bundle": "^3.4 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/dependency-injection": "^5.4 || ^6.0 || ^7.0",
+        "symfony/framework-bundle": "^5.4 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "doctrine/coding-standard": "^8.1",
         "doctrine/orm": "^2.4",
         "phpunit/phpunit": "^8.0 || ^9.0",
-        "symfony/expression-language": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/finder": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/form": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/stopwatch": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/templating": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/twig-bundle": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/uid": "^5.1 || ^6.0",
-        "symfony/validator": "^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/yaml": "^3.4 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/expression-language": "^5.4 || ^6.0 || ^7.0",
+        "symfony/finder": "^5.4 || ^6.0 || ^7.0",
+        "symfony/form": "^5.4 || ^6.0 || ^7.0",
+        "symfony/stopwatch": "^5.4 || ^6.0 || ^7.0",
+        "symfony/templating": "^5.4 || ^6.0 || ^7.0",
+        "symfony/twig-bundle": "^5.4 || ^6.0 || ^7.0",
+        "symfony/uid": "^5.4 || ^6.0 || ^7.0",
+        "symfony/validator": "^5.4 || ^6.0 || ^7.0",
+        "symfony/yaml": "^5.4 || ^6.0 || ^7.0"
     },
     "suggest": {
-        "symfony/expression-language": "Required for opcache preloading ^3.4 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/finder": "Required for cache warmup, supported versions ^3.4 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/expression-language": "Required for opcache preloading ^5.4 || ^6.0 || ^7.0",
+        "symfony/finder": "Required for cache warmup, supported versions ^5.4 || ^6.0 || ^7.0"
     },
     "config": {
         "allow-plugins": {