diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 83ddbec786..9bd0f70983 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,7 +24,7 @@ concurrency:
 
 jobs:
   tests:
-    name: "Tests"
+    name: "Tests PHPUnit 12.x"
     runs-on: ${{ matrix.operating-system }}
     timeout-minutes: 60
 
@@ -32,12 +32,49 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "8.2"
           - "8.3"
           - "8.4"
           - "8.5"
         operating-system: [ ubuntu-latest, windows-latest ]
 
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          tools: pecl
+          extensions: ds,mbstring
+          ini-file: development
+          ini-values: memory_limit=-1
+
+      - name: "Upgrade PHPUnit 12"
+        shell: bash
+        run: |
+          composer require --dev phpunit/phpunit:^12 brianium/paratest:^7.16 symfony/process:^7 symfony/string:^7 symfony/console:^7 --update-with-dependencies --ignore-platform-reqs --working-dir=tests
+          composer require --dev phpunit/phpunit:^12 sebastian/diff --update-with-dependencies --ignore-platform-reqs
+
+      - name: "Check PHP configuration"
+        run: "vendor/bin/phpunit --check-php-configuration"
+
+      - name: "Tests"
+        run: "php tests/vendor/bin/paratest --runner WrapperRunner --no-coverage"
+
+  tests-phpunit11:
+    name: "Tests PHPUnit 11.x"
+    runs-on: ${{ matrix.operating-system }}
+    timeout-minutes: 60
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version:
+          - "8.2"
+        operating-system: [ ubuntu-latest, windows-latest ]
+
     steps:
       - name: "Checkout"
         uses: actions/checkout@v4
@@ -208,7 +245,6 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "8.2"
           - "8.3"
           - "8.4"
         operating-system: [ubuntu-latest]
@@ -227,7 +263,7 @@ jobs:
       - uses: ./build-infection/.github/actions/setup-php
         with:
           php-version: "${{ matrix.php-version }}"
-          extensions: ds,mbstring
+          php-extensions: ds,mbstring
 
       - uses: "ramsey/composer-install@v3"
 
@@ -235,6 +271,12 @@ jobs:
         with:
           working-directory: "tests/"
 
+      - name: "Upgrade PHPUnit with Paratest to speedup coverage generation"
+        shell: bash
+        run: |
+          composer require --dev phpunit/phpunit:^12 brianium/paratest:^7.16 symfony/process:^7 symfony/string:^7 symfony/console:^7 --update-with-dependencies --ignore-platform-reqs --working-dir=tests
+          composer require --dev phpunit/phpunit:^12 sebastian/diff --update-with-dependencies --ignore-platform-reqs
+
       - uses: "ramsey/composer-install@v3"
         with:
           working-directory: "build-infection/"
@@ -266,6 +308,7 @@ jobs:
           php -d pcov.enabled=1 tests/vendor/bin/paratest \
             --passthru-php="'-d' 'pcov.enabled=1'" \
             --coverage-xml=tmp/coverage/coverage-xml --log-junit=tmp/coverage/junit.xml
+            --exclude-source-from-xml-coverage
 
       - name: "Run infection"
         run: |
diff --git a/composer.json b/composer.json
index 6ba8e04289..491e205e88 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
 		"react/promise": "^3.2",
 		"react/socket": "^1.3",
 		"react/stream": "^1.1",
-		"sebastian/diff": "^6.0.2",
+		"sebastian/diff": "^6.0.2 || ^7",
 		"symfony/console": "^5.4.3",
 		"symfony/finder": "^5.4.3",
 		"symfony/polyfill-intl-grapheme": "^1.23",
diff --git a/composer.lock b/composer.lock
index 8309df4662..661b45a80a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f6988e269ffb0526d70d88c50dd488e0",
+    "content-hash": "3d919d524c799e26f9f7a91232600138",
     "packages": [
         {
             "name": "clue/ndjson-react",
@@ -4936,16 +4936,16 @@
         },
         {
             "name": "phpstan/phpstan-phpunit",
-            "version": "2.0.10",
+            "version": "2.0.x-dev",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan-phpunit.git",
-                "reference": "8d61a5854e7497d95bc85188e13537e99bd7aae7"
+                "reference": "033f6906f7abc5acbe3c81b642ad9e363e1bb4a0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/8d61a5854e7497d95bc85188e13537e99bd7aae7",
-                "reference": "8d61a5854e7497d95bc85188e13537e99bd7aae7",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/033f6906f7abc5acbe3c81b642ad9e363e1bb4a0",
+                "reference": "033f6906f7abc5acbe3c81b642ad9e363e1bb4a0",
                 "shasum": ""
             },
             "require": {
@@ -4962,6 +4962,7 @@
                 "phpstan/phpstan-strict-rules": "^2.0",
                 "phpunit/phpunit": "^9.6"
             },
+            "default-branch": true,
             "type": "phpstan-extension",
             "extra": {
                 "phpstan": {
@@ -4983,9 +4984,9 @@
             "description": "PHPUnit extensions and rules for PHPStan",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
-                "source": "https://github.com/phpstan/phpstan-phpunit/tree/2.0.10"
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/2.0.x"
             },
-            "time": "2025-12-06T11:15:39+00:00"
+            "time": "2025-10-29T08:37:09+00:00"
         },
         {
             "name": "phpstan/phpstan-strict-rules",
diff --git a/phpunit.xml b/phpunit.xml
index 8caf6bb5e6..7e84631214 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd" bootstrap="tests/bootstrap.php" cacheResult="false" colors="true" executionOrder="random" failOnRisky="true" failOnWarning="true" failOnEmptyTestSuite="true" beStrictAboutChangesToGlobalState="true" beStrictAboutOutputDuringTests="true" cacheDirectory="tmp/.phpunit.cache" beStrictAboutCoverageMetadata="true" displayDetailsOnPhpunitDeprecations="true" displayDetailsOnIncompleteTests="true">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd" bootstrap="tests/bootstrap.php" cacheResult="false" colors="true" executionOrder="random" failOnRisky="true" failOnWarning="true" failOnPhpunitWarning="false" failOnEmptyTestSuite="true" beStrictAboutChangesToGlobalState="true" beStrictAboutOutputDuringTests="true" cacheDirectory="tmp/.phpunit.cache" beStrictAboutCoverageMetadata="true" displayDetailsOnPhpunitDeprecations="true" displayDetailsOnIncompleteTests="true">
   <extensions>
     <bootstrap class="PHPStan\Testing\PHPUnit\PHPStanPHPUnitExtension"/>
   </extensions>