diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index e196a5286..9a911787d 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -14,4 +14,4 @@ jobs:
     name: "Static Analysis"
     uses: "doctrine/.github/.github/workflows/static-analysis.yml@1.4.0"
     with:
-      php-version: "7.4"
+      php-version: "8.1"
diff --git a/composer.json b/composer.json
index fd9868eeb..34a67fc54 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "doctrine/persistence": "^2.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "^1.2.0",
+        "phpstan/phpstan": "^1.4.1",
         "phpstan/phpstan-phpunit": "^1",
         "phpunit/phpunit": "^7.5.20 || ^8.5 || ^9.0",
         "doctrine/coding-standard": "^9.0",
diff --git a/lib/Doctrine/Common/Proxy/ProxyGenerator.php b/lib/Doctrine/Common/Proxy/ProxyGenerator.php
index f71cb9159..89a945b53 100644
--- a/lib/Doctrine/Common/Proxy/ProxyGenerator.php
+++ b/lib/Doctrine/Common/Proxy/ProxyGenerator.php
@@ -2,6 +2,7 @@
 
 namespace Doctrine\Common\Proxy;
 
+use BackedEnum;
 use Doctrine\Common\Proxy\Exception\InvalidArgumentException;
 use Doctrine\Common\Proxy\Exception\UnexpectedValueException;
 use Doctrine\Common\Util\ClassUtils;
@@ -19,6 +20,7 @@
 use function array_key_exists;
 use function array_map;
 use function array_slice;
+use function array_unique;
 use function assert;
 use function call_user_func;
 use function chmod;
@@ -27,6 +29,7 @@
 use function explode;
 use function file;
 use function file_put_contents;
+use function get_class;
 use function implode;
 use function in_array;
 use function interface_exists;
@@ -53,6 +56,7 @@
 use function var_export;
 
 use const DIRECTORY_SEPARATOR;
+use const PHP_VERSION_ID;
 
 /**
  * This factory is used to generate proxy classes.
@@ -98,7 +102,7 @@ class ProxyGenerator
     protected $proxyClassTemplate = '<?php
 
 namespace <namespace>;
-
+<enumUseStatements>
 /**
  * DO NOT EDIT THIS FILE - IT WAS CREATED BY DOCTRINE\'S PROXY GENERATOR
  */
@@ -381,6 +385,43 @@ private function generateNamespace(ClassMetadata $class)
         return strrev($parts[1]);
     }
 
+    /**
+     * Enums must have a use statement when used as public property defaults.
+     */
+    public function generateEnumUseStatements(ClassMetadata $class): string
+    {
+        if (PHP_VERSION_ID < 80100) {
+            return "\n";
+        }
+
+        $defaultProperties          = $class->getReflectionClass()->getDefaultProperties();
+        $lazyLoadedPublicProperties = $this->getLazyLoadedPublicPropertiesNames($class);
+        $enumClasses                = [];
+
+        foreach ($class->getReflectionClass()->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {
+            $name = $property->getName();
+
+            if (! in_array($name, $lazyLoadedPublicProperties, true)) {
+                continue;
+            }
+
+            if (array_key_exists($name, $defaultProperties) && $defaultProperties[$name] instanceof BackedEnum) {
+                $enumClassNameParts = explode('\\', get_class($defaultProperties[$name]));
+                $enumClasses[]      = $enumClassNameParts[0];
+            }
+        }
+
+        return implode(
+            "\n",
+            array_map(
+                static function ($className) {
+                    return 'use ' . $className . ';';
+                },
+                array_unique($enumClasses)
+            )
+        ) . "\n";
+    }
+
     /**
      * Generates the original class name.
      *
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index d5070c54e..56040fe49 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,5 +1,5 @@
 parameters:
-    phpVersion: 70100
+    phpVersion: 80100
     level: 3
     paths:
         - lib
@@ -19,6 +19,7 @@ parameters:
         - tests/Doctrine/Tests/Common/Proxy/ProxyLogicTypedPropertiesTest.php
         - tests/Doctrine/Tests/Common/Proxy/SerializedClass.php
         - tests/Doctrine/Tests/Common/Proxy/VariadicTypeHintClass.php
+        - tests/Doctrine/Tests/Common/Proxy/Php71NullableDefaultedNonOptionalHintClass.php
         - tests/Doctrine/Tests/Common/Proxy/generated
     ignoreErrors:
         - '#Access to an undefined property Doctrine\\Common\\Proxy\\Proxy::\$publicField#'
@@ -49,6 +50,10 @@ parameters:
             message: '#^Access to an undefined property Doctrine\\Tests\\Common\\Proxy\\MagicGetByRefClass\:\:\$nonExisting\.$#'
             path: 'tests/Doctrine/Tests/Common/Proxy/ProxyMagicMethodsTest.php'
 
+        -
+            message: "#^Class Doctrine\\\\Tests\\\\Common\\\\Proxy\\\\MagicIssetClassWithInteger not found\\.$#"
+            count: 1
+            path: tests/Doctrine/Tests/Common/Proxy/ProxyMagicMethodsTest.php
 includes:
     - vendor/phpstan/phpstan-phpunit/extension.neon
     - vendor/phpstan/phpstan-phpunit/rules.neon
diff --git a/tests/Doctrine/Tests/Common/Proxy/Php81EnumPublicPropertyType.php b/tests/Doctrine/Tests/Common/Proxy/Php81EnumPublicPropertyType.php
new file mode 100644
index 000000000..27bdfeb30
--- /dev/null
+++ b/tests/Doctrine/Tests/Common/Proxy/Php81EnumPublicPropertyType.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Doctrine\Tests\Common\Proxy;
+
+enum YesOrNo : int {
+    case YES = 1;
+    case NO = 0;
+}
+
+class Php81EnumPublicPropertyType
+{
+    public int $id;
+    public YesOrNo $isEnum = YesOrNo::YES;
+}
diff --git a/tests/Doctrine/Tests/Common/Proxy/ProxyGeneratorTest.php b/tests/Doctrine/Tests/Common/Proxy/ProxyGeneratorTest.php
index 188781f61..1d2841cdd 100644
--- a/tests/Doctrine/Tests/Common/Proxy/ProxyGeneratorTest.php
+++ b/tests/Doctrine/Tests/Common/Proxy/ProxyGeneratorTest.php
@@ -525,6 +525,33 @@ public function testPhp81NeverType()
         );
     }
 
+    /**
+     * @requires PHP >= 8.1.0
+     */
+    public function testEnumDefaultInPublicProperty() : void
+    {
+        $className = Php81EnumPublicPropertyType::class;
+
+        if ( ! class_exists('Doctrine\Tests\Common\ProxyProxy\__CG__\Php81EnumPublicPropertyType', false)) {
+            $metadata = $this->createClassMetadata($className, ['id']);
+
+            $metadata->method('hasField')->will($this->returnValue(true));
+
+            $proxyGenerator = new ProxyGenerator(__DIR__ . '/generated', __NAMESPACE__ . 'Proxy');
+            $this->generateAndRequire($proxyGenerator, $metadata);
+        }
+
+        $this->assertStringContainsString(
+            'use Doctrine;',
+            file_get_contents(__DIR__ . '/generated/__CG__DoctrineTestsCommonProxyPhp81EnumPublicPropertyType.php')
+        );
+
+        $object = new \Doctrine\Tests\Common\ProxyProxy\__CG__\Doctrine\Tests\Common\Proxy\Php81EnumPublicPropertyType();
+        $object = unserialize(serialize($object));
+
+        $this->assertSame($object->isEnum, \Doctrine\Tests\Common\Proxy\YesOrNo::YES);
+    }
+
     /**
      * @param string  $className
      * @param mixed[] $ids