diff --git a/.phpstorm.meta.php b/.phpstorm.meta.php
index af7fbb3e51..667752b0f7 100644
--- a/.phpstorm.meta.php
+++ b/.phpstorm.meta.php
@@ -25,9 +25,4 @@
         \PHPUnit\Framework\TestCase::createPartialMock(0),
         map([""=>"$0"])
     );
-
-    override(
-        \PHPUnit\Framework\TestCase::createTestProxy(0),
-        map([""=>"$0"])
-    );
 }
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index 42a8e01646..2b65133251 100644
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -1436,41 +1436,6 @@ final protected function createPartialMock(string $originalClassName, array $met
         return $partialMock;
     }
 
-    /**
-     * Creates a test proxy for the specified class.
-     *
-     * @template RealInstanceType of object
-     *
-     * @param class-string<RealInstanceType> $originalClassName
-     * @param array<mixed>                   $constructorArguments
-     *
-     * @throws InvalidArgumentException
-     * @throws MockObjectException
-     *
-     * @return MockObject&RealInstanceType
-     *
-     * @deprecated https://github.com/sebastianbergmann/phpunit/issues/5240
-     */
-    final protected function createTestProxy(string $originalClassName, array $constructorArguments = []): MockObject
-    {
-        Event\Facade::emitter()->testTriggeredPhpunitDeprecation(
-            $this->valueObjectForEvents(),
-            'createTestProxy() is deprecated and will be removed in PHPUnit 12 without replacement.',
-        );
-
-        $testProxy = $this->getMockBuilder($originalClassName)
-            ->setConstructorArgs($constructorArguments)
-            ->enableProxyingToOriginalMethods()
-            ->getMock();
-
-        Event\Facade::emitter()->testCreatedTestProxy(
-            $originalClassName,
-            $constructorArguments,
-        );
-
-        return $testProxy;
-    }
-
     protected function transformException(Throwable $t): Throwable
     {
         return $t;
diff --git a/tests/static-analysis/TestUsingMocks.php b/tests/static-analysis/TestUsingMocks.php
index 24770e4c0d..f591ac34a3 100644
--- a/tests/static-analysis/TestUsingMocks.php
+++ b/tests/static-analysis/TestUsingMocks.php
@@ -68,17 +68,6 @@ public function testWillSayHelloThroughCreatePartialMock(): void
         self::assertSame('hello mock!', $mock->sayHello());
     }
 
-    public function testWillSayHelloThroughCreateTestProxy(): void
-    {
-        $mock = $this->createTestProxy(HelloWorldClass::class, []);
-
-        $mock
-            ->method('sayHello')
-            ->willReturn('hello mock!');
-
-        self::assertSame('hello mock!', $mock->sayHello());
-    }
-
     public function testWillSayHelloThroughGetMockBuilder(): void
     {
         $mock = $this
diff --git a/tests/unit/Framework/MockObject/Creation/CreateTestProxyTest.php b/tests/unit/Framework/MockObject/Creation/CreateTestProxyTest.php
deleted file mode 100644
index 9ca8cd0072..0000000000
--- a/tests/unit/Framework/MockObject/Creation/CreateTestProxyTest.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php declare(strict_types=1);
-/*
- * This file is part of PHPUnit.
- *
- * (c) Sebastian Bergmann <sebastian@phpunit.de>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-namespace PHPUnit\Framework\MockObject;
-
-use function assert;
-use PHPUnit\Framework\Attributes\Group;
-use PHPUnit\Framework\Attributes\IgnorePhpunitDeprecations;
-use PHPUnit\Framework\Attributes\Medium;
-use PHPUnit\Framework\Attributes\TestDox;
-use PHPUnit\Framework\TestCase;
-use PHPUnit\TestFixture\MockObject\TestProxyFixture;
-
-#[Group('test-doubles')]
-#[Group('test-doubles/creation')]
-#[Group('test-doubles/test-proxy')]
-#[Medium]
-#[TestDox('createTestProxy()')]
-#[IgnorePhpunitDeprecations]
-final class CreateTestProxyTest extends TestCase
-{
-    public function testCreatesTestProxyForExtendableClass(): void
-    {
-        $proxy = $this->createTestProxy(TestProxyFixture::class);
-
-        $proxy->expects($this->once())
-            ->method('returnString');
-
-        assert($proxy instanceof MockObject);
-        assert($proxy instanceof TestProxyFixture);
-
-        $this->assertSame('result', $proxy->returnString());
-    }
-}