diff --git a/tests/AsyncTestCase.php b/tests/AsyncTestCase.php
index 0e89d7659..09c0eb810 100644
--- a/tests/AsyncTestCase.php
+++ b/tests/AsyncTestCase.php
@@ -154,7 +154,7 @@ class AsyncTestCase extends BaseAsyncTestCase
      */
     public static function assertArrayKeysAreZeroOrString(array $array, string $message = ''): void
     {
-        $isZeroOrString = /** @param mixed $key */ fn($key): bool => $key === 0 || is_string($key);
+        $isZeroOrString = /** @param mixed $key */ static fn($key): bool => $key === 0 || is_string($key);
         $validKeys = array_filter($array, $isZeroOrString, ARRAY_FILTER_USE_KEY);
         self::assertTrue(count($array) === count($validKeys), $message);
     }
diff --git a/tests/CodebaseTest.php b/tests/CodebaseTest.php
index 0a1764307..d10d92014 100644
--- a/tests/CodebaseTest.php
+++ b/tests/CodebaseTest.php
@@ -161,7 +161,7 @@ class CodebaseTest extends TestCase
                         ? (string)$stmt->extends->getAttribute('resolvedName')
                         : '';
                     $storage->custom_metadata['implements'] = array_map(
-                        fn(Name $aspect): string => (string)$aspect->getAttribute('resolvedName'),
+                        static fn(Name $aspect): string => (string)$aspect->getAttribute('resolvedName'),
                         $stmt->implements,
                     );
                     $storage->custom_metadata['a'] = 'b';
diff --git a/tests/Config/ConfigTest.php b/tests/Config/ConfigTest.php
index 9fa8042c5..34a5b06f9 100644
--- a/tests/Config/ConfigTest.php
+++ b/tests/Config/ConfigTest.php
@@ -1108,7 +1108,7 @@ class ConfigTest extends TestCase
                  * @param string $issue_name
                  * @return string
                  */
-                fn($issue_name): string => '<' . $issue_name . ' errorLevel="suppress" />' . "\n",
+                static fn($issue_name): string => '<' . $issue_name . ' errorLevel="suppress" />' . "\n",
                 IssueHandler::getAllIssueTypes(),
             ),
         );
diff --git a/tests/Config/Plugin/Hook/CustomArrayMapFunctionStorageProvider.php b/tests/Config/Plugin/Hook/CustomArrayMapFunctionStorageProvider.php
index fb2853f35..cb3284754 100644
--- a/tests/Config/Plugin/Hook/CustomArrayMapFunctionStorageProvider.php
+++ b/tests/Config/Plugin/Hook/CustomArrayMapFunctionStorageProvider.php
@@ -56,11 +56,10 @@ class CustomArrayMapFunctionStorageProvider implements DynamicFunctionStoragePro
         $custom_array_map_storage->return_type = self::createReturnType($all_expected_callables);
         $custom_array_map_storage->params = [
             ...array_map(
-                function (TCallable $expected, int $offset) {
+                static function (TCallable $expected, int $offset) {
                     $t = new Union([$expected]);
                     $param = new FunctionLikeParameter('fn' . $offset, false, $t, $t);
                     $param->is_optional = false;
-
                     return $param;
                 },
                 $all_expected_callables,
diff --git a/tests/DocumentationTest.php b/tests/DocumentationTest.php
index 9768eecfa..d86293a82 100644
--- a/tests/DocumentationTest.php
+++ b/tests/DocumentationTest.php
@@ -348,7 +348,7 @@ class DocumentationTest extends TestCase
 
         $duplicate_shortcodes = array_filter(
             $all_shortcodes,
-            fn($issues): bool => count($issues) > 1
+            static fn($issues): bool => count($issues) > 1
         );
 
         $this->assertEquals(
diff --git a/tests/FileDiffTest.php b/tests/FileDiffTest.php
index 0e7982552..2e206537b 100644
--- a/tests/FileDiffTest.php
+++ b/tests/FileDiffTest.php
@@ -64,7 +64,7 @@ class FileDiffTest extends TestCase
              * @param array{0: int, 1: int, 2: int, 3: int} $arr
              * @return array{0: int, 1: int}
              */
-            fn(array $arr): array => [$arr[2], $arr[3]],
+            static fn(array $arr): array => [$arr[2], $arr[3]],
             $diff[3],
         );
 
@@ -135,7 +135,7 @@ class FileDiffTest extends TestCase
              * @param array{0: int, 1: int, 2: int, 3: int} $arr
              * @return array{0: int, 1: int}
              */
-            fn(array $arr): array => [$arr[2], $arr[3]],
+            static fn(array $arr): array => [$arr[2], $arr[3]],
             $diff[3],
         );
 
diff --git a/tests/TaintTest.php b/tests/TaintTest.php
index f83d45bae..4e7c2bda4 100644
--- a/tests/TaintTest.php
+++ b/tests/TaintTest.php
@@ -2602,7 +2602,7 @@ class TaintTest extends TestCase
         $this->analyzeFile($filePath, new Context(), false);
 
         $actualIssueTypes = array_map(
-            fn(IssueData $issue): string => $issue->type . '{ ' . trim($issue->snippet) . ' }',
+            static fn(IssueData $issue): string => $issue->type . '{ ' . trim($issue->snippet) . ' }',
             IssueBuffer::getIssuesDataForFile($filePath),
         );
         self::assertSame($expectedIssuesTypes, $actualIssueTypes);
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 8e61664f8..5ddeebd3b 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -151,7 +151,7 @@ class TestCase extends BaseTestCase
 
     public static function assertArrayKeysAreZeroOrString(array $array, string $message = ''): void
     {
-        $isZeroOrString = /** @param mixed $key */ fn($key): bool => $key === 0 || is_string($key);
+        $isZeroOrString = /** @param mixed $key */ static fn($key): bool => $key === 0 || is_string($key);
         $validKeys = array_filter($array, $isZeroOrString, ARRAY_FILTER_USE_KEY);
         self::assertTrue(count($array) === count($validKeys), $message);
     }
diff --git a/tests/TypeComparatorTest.php b/tests/TypeComparatorTest.php
index 434a1f304..00ad55bea 100644
--- a/tests/TypeComparatorTest.php
+++ b/tests/TypeComparatorTest.php
@@ -90,7 +90,7 @@ class TypeComparatorTest extends TestCase
         $basic_types['list{123}'] = true;
 
         return array_map(
-            fn($type) => [$type],
+            static fn($type) => [$type],
             array_keys($basic_types),
         );
     }
diff --git a/tests/fixtures/DestructiveAutoloader/autoloader.php b/tests/fixtures/DestructiveAutoloader/autoloader.php
index 17cb0a152..37a8624de 100644
--- a/tests/fixtures/DestructiveAutoloader/autoloader.php
+++ b/tests/fixtures/DestructiveAutoloader/autoloader.php
@@ -9,7 +9,7 @@ foreach ($GLOBALS as $key => $_) {
     $GLOBALS[$key] = new Exception;
 }
 
-spl_autoload_register(function() {
+spl_autoload_register(static function () {
     // and destroy vars again
     // this will run during scanning (?)
     foreach ($GLOBALS as $key => $_) {
diff --git a/tests/fixtures/SuicidalAutoloader/autoloader.php b/tests/fixtures/SuicidalAutoloader/autoloader.php
index 365fa7b72..d506219c1 100644
--- a/tests/fixtures/SuicidalAutoloader/autoloader.php
+++ b/tests/fixtures/SuicidalAutoloader/autoloader.php
@@ -3,7 +3,7 @@
 use React\Promise\PromiseInterface as ReactPromise;
 use Composer\InstalledVersions;
 
-spl_autoload_register(function (string $className) {
+spl_autoload_register(static function (string $className) {
     $knownBadClasses = [
         ReactPromise::class, // amphp/amp
         ResourceBundle::class, // symfony/polyfill-php73
@@ -25,11 +25,9 @@ spl_autoload_register(function (string $className) {
         'Symfony\Component\String\s',
         'Symfony\Component\Translation\t',
     ];
-
     if (in_array($className, $knownBadClasses)) {
         return;
     }
-
     $ex = new RuntimeException('Attempted to load ' . $className);
     echo $ex->__toString() . "\n\n" . $ex->getTraceAsString() . "\n\n";
     exit(70);