diff --git a/.gitattributes b/.gitattributes
index b525bdb..49067b5 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -14,6 +14,5 @@
 /phpstan.neon.dist export-ignore
 /phpstan-baseline.neon export-ignore
 /phpunit.xml.dist export-ignore
-/phpunit-phpstan.xml.dist export-ignore
 /tests export-ignore
 /CONTRIBUTING.md export-ignore
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 6ba1fca..b2c8900 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -51,46 +51,4 @@ jobs:
           composer update ${{ env.COMPOSER_FLAGS }}
 
       - name: "Run tests"
-        run: "vendor/bin/simple-phpunit --verbose"
-
-  phpstan_tests:
-    name: "CI PHPStan Ext"
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        php-version:
-          - "7.3"
-          - "8.3"
-
-    steps:
-      - name: "Checkout"
-        uses: "actions/checkout@v2"
-
-      - name: "Install PHP"
-        uses: "shivammathur/setup-php@v2"
-        with:
-          coverage: "none"
-          php-version: "${{ matrix.php-version }}"
-
-      - name: Get composer cache directory
-        id: composercache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-      - name: Cache dependencies
-        uses: actions/cache@v2
-        with:
-          path: ${{ steps.composercache.outputs.dir }}
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
-          restore-keys: ${{ runner.os }}-composer-
-
-      - name: "Install latest dependencies"
-        run: |
-          # Require PHPUnit directly bypassing the symfony bridge
-          composer remove symfony/phpunit-bridge --dev --no-update
-          composer require phpunit/phpunit:^9 --dev --no-update
-          composer update ${{ env.COMPOSER_FLAGS }}
-
-      - name: "Run tests"
-        run: vendor/bin/phpunit -c phpunit-phpstan.xml.dist
+        run: "vendor/bin/phpunit"
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index 93bea17..f135b11 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -44,8 +44,5 @@ jobs:
       - name: "Install latest dependencies"
         run: "composer update ${{ env.COMPOSER_FLAGS }}"
 
-      - name: "Initialize PHPUnit sources"
-        run: "vendor/bin/simple-phpunit --filter NO_TEST_JUST_AUTOLOAD_THANKS"
-
       - name: "Run PHPStan"
         run: "composer phpstan"
diff --git a/composer.json b/composer.json
index 9531696..ec707cc 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "php": "^7.2 || ^8.0"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "^7",
+        "phpunit/phpunit": "^8 || ^9",
         "phpstan/phpstan": "^1.11.6",
         "phpstan/phpstan-strict-rules": "^1.1"
     },
@@ -43,7 +43,7 @@
         }
     },
     "scripts": {
-        "test": "SYMFONY_PHPUNIT_REMOVE_RETURN_TYPEHINT=1 vendor/bin/simple-phpunit",
+        "test": "vendor/bin/phpunit",
         "phpstan": "phpstan analyse"
     }
 }
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 900cf2d..890f3bc 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -8,7 +8,7 @@ parameters:
     treatPhpDocTypesAsCertain: false
 
     bootstrapFiles:
-        - tests/phpstan-locate-phpunit-autoloader.php
+        - vendor/autoload.php
 
     excludePaths:
         - tests/PHPStanTests/nsrt/*
diff --git a/phpunit-phpstan.xml.dist b/phpunit-phpstan.xml.dist
deleted file mode 100644
index 1ab1ead..0000000
--- a/phpunit-phpstan.xml.dist
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.5/phpunit.xsd"
-    backupGlobals="false"
-    colors="true"
-    bootstrap="vendor/autoload.php"
-    >
-    <testsuites>
-        <testsuite name="PCRE Test Suite">
-            <directory>tests/PHPStanTests</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
-</phpunit>
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 4b57ef9..4a7697f 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -8,8 +8,7 @@
     >
     <testsuites>
         <testsuite name="PCRE Test Suite">
-            <directory>tests/PregTests</directory>
-            <directory>tests/RegexTests</directory>
+            <directory>tests</directory>
         </testsuite>
     </testsuites>
 
diff --git a/tests/phpstan-locate-phpunit-autoloader.php b/tests/phpstan-locate-phpunit-autoloader.php
deleted file mode 100644
index a9e670c..0000000
--- a/tests/phpstan-locate-phpunit-autoloader.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-$bestDirFound = null;
-$dirs = (array) glob(__DIR__.'/../vendor/bin/.phpunit/phpunit-*', GLOB_ONLYDIR);
-natsort($dirs);
-
-foreach (array_reverse($dirs) as $dir) {
-    $bestDirFound = $dir;
-    if (PHP_VERSION_ID >= 80000 && false !== strpos((string) $dir, 'phpunit-9')) {
-        break;
-    }
-    if (PHP_VERSION_ID < 80000 && false !== strpos((string) $dir, 'phpunit-8')) {
-        break;
-    }
-}
-
-if (null === $bestDirFound) {
-    echo 'Run "composer test" to initialize PHPUnit sources before running PHPStan'.PHP_EOL;
-    exit(1);
-}
-
-include $bestDirFound.'/vendor/autoload.php';