diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 88543fb..07de108 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -97,6 +97,21 @@ jobs:
         dependencies:
           - "lowest"
           - "highest"
+        phpunit-version:
+          - "^9.5"
+          - "^10.5"
+          - "^11.5"
+        exclude:
+          - php-version: "7.4"
+            phpunit-version: "^10.5"
+          - php-version: "8.0"
+            phpunit-version: "^10.5"
+          - php-version: "7.4"
+            phpunit-version: "^11.5"
+          - php-version: "8.0"
+            phpunit-version: "^11.5"
+          - php-version: "8.1"
+            phpunit-version: "^11.5"
 
     steps:
       - name: "Checkout"
@@ -108,6 +123,9 @@ jobs:
           coverage: "none"
           php-version: "${{ matrix.php-version }}"
 
+      - name: "Require specific PHPUnit version"
+        run: "composer require --dev phpunit/phpunit:${{ matrix.phpunit-version }}"
+
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
         run: "composer update --prefer-lowest --no-interaction --no-progress"
@@ -136,6 +154,21 @@ jobs:
         dependencies:
           - "lowest"
           - "highest"
+        phpunit-version:
+          - "^9.5"
+          - "^10.5"
+          - "^11.5"
+        exclude:
+          - php-version: "7.4"
+            phpunit-version: "^10.5"
+          - php-version: "8.0"
+            phpunit-version: "^10.5"
+          - php-version: "7.4"
+            phpunit-version: "^11.5"
+          - php-version: "8.0"
+            phpunit-version: "^11.5"
+          - php-version: "8.1"
+            phpunit-version: "^11.5"
 
     steps:
       - name: "Checkout"
@@ -149,6 +182,9 @@ jobs:
           extensions: mbstring
           tools: composer:v2
 
+      - name: "Require specific PHPUnit version"
+        run: "composer require --dev phpunit/phpunit:${{ matrix.phpunit-version }}"
+
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
         run: "composer update --prefer-lowest --no-interaction --no-progress"
diff --git a/composer.json b/composer.json
index 212c518..be6b3bd 100644
--- a/composer.json
+++ b/composer.json
@@ -13,15 +13,13 @@
 		"phpunit/phpunit": "<7.0"
 	},
 	"require-dev": {
+		"nikic/php-parser": "^5",
 		"php-parallel-lint/php-parallel-lint": "^1.2",
 		"phpstan/phpstan-deprecation-rules": "^2.0",
 		"phpstan/phpstan-strict-rules": "^2.0",
 		"phpunit/phpunit": "^9.6"
 	},
 	"config": {
-		"platform": {
-			"php": "7.4.6"
-		},
 		"sort-packages": true
 	},
 	"extra": {
diff --git a/phpunit.xml b/phpunit.xml
index 8f71615..420ef74 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -12,20 +12,6 @@
          failOnWarning="true"
          xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xml"
 >
-    <coverage>
-        <include>
-            <directory suffix=".php">./src</directory>
-        </include>
-        <report>
-            <clover outputFile="tests/tmp/clover.xml"/>
-            <text
-                outputFile="php://stdout"
-                showUncoveredFiles="true"
-                showOnlySummary="true"
-            />
-        </report>
-    </coverage>
-
     <testsuites>
         <testsuite name="PHPStan for PHPUnit">
             <directory suffix="Test.php">tests</directory>
diff --git a/tests/Type/PHPUnit/AssertFunctionTypeSpecifyingExtensionTest.php b/tests/Type/PHPUnit/AssertFunctionTypeSpecifyingExtensionTest.php
index 2d43f8b..4405c4d 100644
--- a/tests/Type/PHPUnit/AssertFunctionTypeSpecifyingExtensionTest.php
+++ b/tests/Type/PHPUnit/AssertFunctionTypeSpecifyingExtensionTest.php
@@ -9,14 +9,14 @@ class AssertFunctionTypeSpecifyingExtensionTest extends TypeInferenceTestCase
 {
 
 	/** @return mixed[] */
-	public function dataFileAsserts(): iterable
+	public static function dataFileAsserts(): iterable
 	{
 		if (function_exists('PHPUnit\\Framework\\assertInstanceOf')) {
-			yield from $this->gatherAssertTypes(__DIR__ . '/data/assert-function.php');
+			yield from self::gatherAssertTypes(__DIR__ . '/data/assert-function.php');
 		}
 
 		if (function_exists('PHPUnit\\Framework\\assertObjectHasProperty')) {
-			yield from $this->gatherAssertTypes(__DIR__ . '/data/assert-function-9.6.11.php');
+			yield from self::gatherAssertTypes(__DIR__ . '/data/assert-function-9.6.11.php');
 		}
 
 		return [];
diff --git a/tests/Type/PHPUnit/AssertMethodTypeSpecifyingExtensionTest.php b/tests/Type/PHPUnit/AssertMethodTypeSpecifyingExtensionTest.php
index e1841e0..0b36c2b 100644
--- a/tests/Type/PHPUnit/AssertMethodTypeSpecifyingExtensionTest.php
+++ b/tests/Type/PHPUnit/AssertMethodTypeSpecifyingExtensionTest.php
@@ -8,9 +8,9 @@ class AssertMethodTypeSpecifyingExtensionTest extends TypeInferenceTestCase
 {
 
 	/** @return mixed[] */
-	public function dataFileAsserts(): iterable
+	public static function dataFileAsserts(): iterable
 	{
-		yield from $this->gatherAssertTypes(__DIR__ . '/data/assert-method.php');
+		yield from self::gatherAssertTypes(__DIR__ . '/data/assert-method.php');
 	}
 
 	/**
diff --git a/tests/Type/PHPUnit/data/assert-function.php b/tests/Type/PHPUnit/data/assert-function.php
index 851e07b..0fabf59 100644
--- a/tests/Type/PHPUnit/data/assert-function.php
+++ b/tests/Type/PHPUnit/data/assert-function.php
@@ -53,12 +53,6 @@ public function arrayHasStringKey(array $a, \ArrayAccess $b): void
 		assertType("ArrayAccess", $b);
 	}
 
-	public function objectHasAttribute(object $a): void
-	{
-		assertObjectHasAttribute('property', $a);
-		assertType("object&hasProperty(property)", $a);
-	}
-
 	public function testEmpty($a): void
 	{
 		assertEmpty($a);