diff --git a/tests/php/Extension/FluentExtensionTest.php b/tests/php/Extension/FluentExtensionTest.php
index f6671d4f..5498f3eb 100644
--- a/tests/php/Extension/FluentExtensionTest.php
+++ b/tests/php/Extension/FluentExtensionTest.php
@@ -307,7 +307,7 @@ public function testLocalisedFieldsCanBeSorted($locale, array $sortArgs, $expect
     /**
      * @return array[] Keys: Locale, sorting arguments, expected titles in result
      */
-    public function sortRecordProvider()
+    public static function sortRecordProvider()
     {
         return [
             /**
diff --git a/tests/php/Extension/FluentSiteTreeExtensionTest.php b/tests/php/Extension/FluentSiteTreeExtensionTest.php
index dac0d88e..9962e92a 100644
--- a/tests/php/Extension/FluentSiteTreeExtensionTest.php
+++ b/tests/php/Extension/FluentSiteTreeExtensionTest.php
@@ -116,7 +116,7 @@ public function testGetLocales()
      *  - page id
      *  - expected link
      */
-    public function provideURLTests()
+    public static function provideURLTests()
     {
         return [
             // Non-domain tests
@@ -473,7 +473,7 @@ public function testHomeNotVisibleInCMSOneConfigExact()
     /**
      * @return array[]
      */
-    public function localePrefixUrlProvider()
+    public static function localePrefixUrlProvider()
     {
         return [
             'locale_with_domain'            => ['en_US', 'about', 'http://www.example.com/usa/'],
@@ -521,7 +521,7 @@ public function testPageVisibilityWithFallback($cmsMode, $frontendMode, bool $is
         });
     }
 
-    public function localeFallbackProvider(): array
+    public static function localeFallbackProvider(): array
     {
         return [
             'Frontend / no inheritance' => [
diff --git a/tests/php/Extension/LocalisedCopyTest/DuplicationTest.php b/tests/php/Extension/LocalisedCopyTest/DuplicationTest.php
index 8c53604f..7482ae81 100644
--- a/tests/php/Extension/LocalisedCopyTest/DuplicationTest.php
+++ b/tests/php/Extension/LocalisedCopyTest/DuplicationTest.php
@@ -238,7 +238,7 @@ public function testEditWithInheritedRelation(string $locale, bool $duplicated,
         });
     }
 
-    public function localesProvider(): array
+    public static function localesProvider(): array
     {
         return [
             ['en_NZ', false, true],
@@ -248,7 +248,7 @@ public function localesProvider(): array
         ];
     }
 
-    public function copyStateProvider(): array
+    public static function copyStateProvider(): array
     {
         return [
             [false],
diff --git a/tests/php/Extension/LocalisedVersionsTest.php b/tests/php/Extension/LocalisedVersionsTest.php
index 1794e2f4..f13549d1 100644
--- a/tests/php/Extension/LocalisedVersionsTest.php
+++ b/tests/php/Extension/LocalisedVersionsTest.php
@@ -217,7 +217,7 @@ public function testArchive(): void
         });
     }
 
-    public function latestVersionsProvider(): array
+    public static function latestVersionsProvider(): array
     {
         return [
             [null, 6],
@@ -227,7 +227,7 @@ public function latestVersionsProvider(): array
         ];
     }
 
-    public function listVersionsProvider(): array
+    public static function listVersionsProvider(): array
     {
         return [
             [
diff --git a/tests/php/Middleware/DetectLocaleMiddlewareTest.php b/tests/php/Middleware/DetectLocaleMiddlewareTest.php
index bf1f4e6c..98896841 100644
--- a/tests/php/Middleware/DetectLocaleMiddlewareTest.php
+++ b/tests/php/Middleware/DetectLocaleMiddlewareTest.php
@@ -88,7 +88,7 @@ public function testGetLocalePriority($url, $routeParams, $queryParams, $persist
     /**
      * @return array[] List of tests with arguments: $url, $routeParams, $queryParams, $persisted, $header, $expected
      */
-    public function localePriorityProvider()
+    public static function localePriorityProvider()
     {
         return [/*
             // First priority: controller routing params
diff --git a/tests/php/Middleware/InitStateMiddlewareTest.php b/tests/php/Middleware/InitStateMiddlewareTest.php
index 3989c35b..cd8d02cf 100644
--- a/tests/php/Middleware/InitStateMiddlewareTest.php
+++ b/tests/php/Middleware/InitStateMiddlewareTest.php
@@ -24,7 +24,7 @@ public function testGetIsFrontend($url, $getVars, $expected)
     /**
      * @return array[]
      */
-    public function isFrontendProvider()
+    public static function isFrontendProvider()
     {
         return [
             ['admin', [], false],
diff --git a/tests/php/Model/LocalDateTimeTest.php b/tests/php/Model/LocalDateTimeTest.php
index db2448cb..0bbb4ee4 100644
--- a/tests/php/Model/LocalDateTimeTest.php
+++ b/tests/php/Model/LocalDateTimeTest.php
@@ -82,7 +82,7 @@ public function testSwitchLocales($locale, $expectedTime)
         });
     }
 
-    public function provideTestSwitchLocales()
+    public static function provideTestSwitchLocales()
     {
         return [
             [
diff --git a/tests/php/Model/LocaleTest.php b/tests/php/Model/LocaleTest.php
index 24d95f7c..12fcaf41 100644
--- a/tests/php/Model/LocaleTest.php
+++ b/tests/php/Model/LocaleTest.php
@@ -79,7 +79,7 @@ public function testIsLocale($locale, $input, $expected)
     /**
      * @return array[]
      */
-    public function isLocaleProvider()
+    public static function isLocaleProvider()
     {
         return [
             ['en_NZ', 'en_NZ', true],
diff --git a/tests/php/Task/InitialPageLocalisationTaskTest.php b/tests/php/Task/InitialPageLocalisationTaskTest.php
index 664528e5..fcc19a04 100644
--- a/tests/php/Task/InitialPageLocalisationTaskTest.php
+++ b/tests/php/Task/InitialPageLocalisationTaskTest.php
@@ -105,7 +105,7 @@ public function testInitialPageLocalisation(bool $publish, int $limit, array $lo
         $this->assertEquals($published, $pages);
     }
 
-    public function publishStateProvider(): array
+    public static function publishStateProvider(): array
     {
         return [
             [