diff --git a/.psalm/baseline.xml b/.psalm/baseline.xml
index 26a42470677..fce50f89d5c 100644
--- a/.psalm/baseline.xml
+++ b/.psalm/baseline.xml
@@ -715,7 +715,7 @@
       <code>getResult</code>
       <code>runTest</code>
     </MissingReturnType>
-    <MissingThrowsDocblock occurrences="19">
+    <MissingThrowsDocblock occurrences="20">
       <code>cacheDirectory</code>
       <code>endTest</code>
       <code>endTest</code>
@@ -730,6 +730,7 @@
       <code>getMockForTrait</code>
       <code>getObjectForTrait</code>
       <code>new Differ($header)</code>
+      <code>throw new Exception('This test uses TestCase::prophesize(), but phpspec/prophecy is not installed. Please run "composer require --dev phpspec/prophecy ^1.12.1".');</code>
     </MissingThrowsDocblock>
     <PossiblyNullPropertyAssignmentValue occurrences="3">
       <code>$beStrictAboutChangesToGlobalState</code>
@@ -745,9 +746,6 @@
       <code>$runClassInSeparateProcess</code>
       <code>$runTestInSeparateProcess</code>
     </PropertyNotSetInConstructor>
-    <RawObjectIteration occurrences="1">
-      <code>$methodProphecies</code>
-    </RawObjectIteration>
     <RedundantCastGivenDocblockType occurrences="1">
       <code>(bool) $this-&gt;backupStaticAttributes</code>
     </RedundantCastGivenDocblockType>
@@ -757,6 +755,22 @@
     <RedundantConditionGivenDocblockType occurrences="1">
       <code>$this-&gt;prophet !== null</code>
     </RedundantConditionGivenDocblockType>
+    <UndefinedClass occurrences="6">
+      <code>$e</code>
+      <code>ObjectProphecy</code>
+      <code>PredictionException</code>
+      <code>PredictionException</code>
+      <code>Prophet</code>
+      <code>Prophet</code>
+    </UndefinedClass>
+    <UndefinedDocblockClass occurrences="6">
+      <code>$this-&gt;prophet</code>
+      <code>$this-&gt;prophet</code>
+      <code>\Prophecy\Exception\Doubler\ClassNotFoundException</code>
+      <code>\Prophecy\Exception\Doubler\DoubleException</code>
+      <code>\Prophecy\Exception\Doubler\InterfaceNotFoundException</code>
+      <code>\Prophecy\Prophet</code>
+    </UndefinedDocblockClass>
   </file>
   <file src="src/Framework/TestResult.php">
     <ArgumentTypeCoercion occurrences="1">
@@ -1295,6 +1309,13 @@
   </file>
   <file src="src/Util/ExcludeList.php">
     <MissingThrowsDocblock occurrences="1"/>
+    <UndefinedClass occurrences="5">
+      <code>Assert</code>
+      <code>DocBlock</code>
+      <code>Project</code>
+      <code>Prophet</code>
+      <code>Type</code>
+    </UndefinedClass>
   </file>
   <file src="src/Util/Filter.php">
     <MissingParamType occurrences="1">
diff --git a/ChangeLog-8.5.md b/ChangeLog-8.5.md
index 42b4923edde..04ec1cea919 100644
--- a/ChangeLog-8.5.md
+++ b/ChangeLog-8.5.md
@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 8.5 release series are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
+## [8.5.29] - 2022-MM-DD
+
+### Changed
+
+* [#5033](https://github.com/sebastianbergmann/phpunit/issues/5033): Do not depend on phpspec/prophecy
+
 ## [8.5.28] - 2022-07-29
 
 ### Fixed
@@ -233,6 +239,7 @@ All notable changes of the PHPUnit 8.5 release series are documented in this fil
 * [#3967](https://github.com/sebastianbergmann/phpunit/issues/3967): Cannot double interface that extends interface that extends `\Throwable`
 * [#3968](https://github.com/sebastianbergmann/phpunit/pull/3968): Test class run in a separate PHP process are passing when `exit` called inside
 
+[8.5.29]: https://github.com/sebastianbergmann/phpunit/compare/8.5.28...8.5
 [8.5.28]: https://github.com/sebastianbergmann/phpunit/compare/8.5.27...8.5.28
 [8.5.27]: https://github.com/sebastianbergmann/phpunit/compare/8.5.26...8.5.27
 [8.5.26]: https://github.com/sebastianbergmann/phpunit/compare/8.5.25...8.5.26
diff --git a/ChangeLog-9.5.md b/ChangeLog-9.5.md
index d9cc683e66b..90c23b09eb9 100644
--- a/ChangeLog-9.5.md
+++ b/ChangeLog-9.5.md
@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 9.5 release series are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
+## [9.5.23] - 2022-MM-DD
+
+### Changed
+
+* [#5033](https://github.com/sebastianbergmann/phpunit/issues/5033): Do not depend on phpspec/prophecy
+
 ## [9.5.22] - 2022-08-20
 
 ### Fixed
@@ -172,6 +178,7 @@ All notable changes of the PHPUnit 9.5 release series are documented in this fil
 
 * [#4535](https://github.com/sebastianbergmann/phpunit/issues/4535): `getMockFromWsdl()` does not handle methods that do not have parameters correctly
 
+[9.5.23]: https://github.com/sebastianbergmann/phpunit/compare/9.5.22...9.5
 [9.5.22]: https://github.com/sebastianbergmann/phpunit/compare/9.5.21...9.5.22
 [9.5.21]: https://github.com/sebastianbergmann/phpunit/compare/9.5.20...9.5.21
 [9.5.20]: https://github.com/sebastianbergmann/phpunit/compare/9.5.19...9.5.20
diff --git a/build.xml b/build.xml
index 6e1d3756dc1..56bca57246e 100644
--- a/build.xml
+++ b/build.xml
@@ -106,6 +106,12 @@
     </target>
 
     <target name="-phar-prepare" depends="clean,install-dependencies">
+        <exec executable="${basedir}/tools/composer" taskname="composer">
+            <arg value="require"/>
+            <arg value="phpspec/prophecy"/>
+            <arg value="^1.12.1"/>
+        </exec>
+
         <mkdir dir="${basedir}/build/artifacts"/>
         <mkdir dir="${basedir}/build/tmp/phar"/>
         <mkdir dir="${basedir}/build/tmp/phar-scoped"/>
@@ -344,6 +350,11 @@
                 <include name="**/*.php" />
             </fileset>
         </copy>
+
+        <exec executable="${basedir}/tools/composer" taskname="composer">
+            <arg value="remove"/>
+            <arg value="phpspec/prophecy"/>
+        </exec>
     </target>
 
     <target name="-phar-build" depends="-phar-determine-version">
diff --git a/composer.json b/composer.json
index f3e63684693..fbe9221f33a 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,6 @@
         "myclabs/deep-copy": "^1.10.1",
         "phar-io/manifest": "^2.0.3",
         "phar-io/version": "^3.0.2",
-        "phpspec/prophecy": "^1.12.1",
         "phpunit/php-code-coverage": "^9.2.13",
         "phpunit/php-file-iterator": "^3.0.5",
         "phpunit/php-invoker": "^3.1.1",
@@ -50,9 +49,6 @@
         "sebastian/type": "^3.0",
         "sebastian/version": "^3.0.2"
     },
-    "require-dev": {
-        "phpspec/prophecy-phpunit": "^2.0.1"
-    },
     "config": {
         "platform": {
             "php": "7.3.0"
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index a05ed7fbde4..59bf4ec662c 100644
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -1954,6 +1954,10 @@ protected function getObjectForTrait(string $traitName, array $arguments = [], s
      */
     protected function prophesize(?string $classOrInterface = null): ObjectProphecy
     {
+        if (!class_exists(Prophet::class)) {
+            throw new Exception('This test uses TestCase::prophesize(), but phpspec/prophecy is not installed. Please run "composer require --dev phpspec/prophecy".');
+        }
+
         $this->addWarning('PHPUnit\Framework\TestCase::prophesize() is deprecated and will be removed in PHPUnit 10. Please use the trait provided by phpspec/prophecy-phpunit.');
 
         if (is_string($classOrInterface)) {
diff --git a/tests/_files/ExternalProphecyIntegrationTest.php b/tests/_files/ExternalProphecyIntegrationTest.php
deleted file mode 100644
index 9a8aeeec17c..00000000000
--- a/tests/_files/ExternalProphecyIntegrationTest.php
+++ /dev/null
@@ -1,28 +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\TestFixture;
-
-use PHPUnit\Framework\TestCase;
-use Prophecy\PhpUnit\ProphecyTrait;
-
-final class ExternalProphecyIntegrationTest extends TestCase
-{
-    use ProphecyTrait;
-
-    public function testOne(): void
-    {
-        $prophecy = $this->prophesize(\PHPUnit\TestFixture\AnInterface::class);
-        $prophecy->doSomething()->willReturn('result')->shouldBeCalled();
-
-        $revelation = $prophecy->reveal();
-
-        $this->assertSame('result', $revelation->doSomething());
-    }
-}
diff --git a/tests/_files/InternalProphecyIntegrationTest.php b/tests/_files/InternalProphecyIntegrationTest.php
deleted file mode 100644
index 882d1f70878..00000000000
--- a/tests/_files/InternalProphecyIntegrationTest.php
+++ /dev/null
@@ -1,25 +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\TestFixture;
-
-use PHPUnit\Framework\TestCase;
-
-final class InternalProphecyIntegrationTest extends TestCase
-{
-    public function testOne(): void
-    {
-        $prophecy = $this->prophesize(\PHPUnit\TestFixture\AnInterface::class);
-        $prophecy->doSomething()->willReturn('result')->shouldBeCalled();
-
-        $revelation = $prophecy->reveal();
-
-        $this->assertSame('result', $revelation->doSomething());
-    }
-}
diff --git a/tests/end-to-end/generic/external-prophecy-integration-test.phpt b/tests/end-to-end/generic/external-prophecy-integration-test.phpt
deleted file mode 100644
index 001f0cea425..00000000000
--- a/tests/end-to-end/generic/external-prophecy-integration-test.phpt
+++ /dev/null
@@ -1,18 +0,0 @@
---TEST--
-phpunit ../../_files/ExternalProphecyIntegrationTest.php
---FILE--
-<?php declare(strict_types=1);
-$_SERVER['argv'][] = '--do-not-cache-result';
-$_SERVER['argv'][] = '--no-configuration';
-$_SERVER['argv'][] = __DIR__ . '/../../_files/ExternalProphecyIntegrationTest.php';
-
-require_once __DIR__ . '/../../bootstrap.php';
-PHPUnit\TextUI\Command::main();
---EXPECTF--
-PHPUnit %s #StandWithUkraine
-
-.                                                                   1 / 1 (100%)
-
-Time: %s, Memory: %s
-
-OK (1 test, 2 assertions)
diff --git a/tests/end-to-end/generic/internal-prophecy-integration-test.phpt b/tests/end-to-end/generic/internal-prophecy-integration-test.phpt
deleted file mode 100644
index e81568754da..00000000000
--- a/tests/end-to-end/generic/internal-prophecy-integration-test.phpt
+++ /dev/null
@@ -1,24 +0,0 @@
---TEST--
-phpunit ../../_files/InternalProphecyIntegrationTest.php
---FILE--
-<?php declare(strict_types=1);
-$_SERVER['argv'][] = '--do-not-cache-result';
-$_SERVER['argv'][] = '--no-configuration';
-$_SERVER['argv'][] = __DIR__ . '/../../_files/InternalProphecyIntegrationTest.php';
-
-require_once __DIR__ . '/../../bootstrap.php';
-PHPUnit\TextUI\Command::main();
---EXPECTF--
-PHPUnit %s #StandWithUkraine
-
-W                                                                   1 / 1 (100%)
-
-Time: %s, Memory: %s
-
-There was 1 warning:
-
-1) PHPUnit\TestFixture\InternalProphecyIntegrationTest::testOne
-PHPUnit\Framework\TestCase::prophesize() is deprecated and will be removed in PHPUnit 10. Please use the trait provided by phpspec/prophecy-phpunit.
-
-WARNINGS!
-Tests: 1, Assertions: 2, Warnings: 1.