diff --git a/composer.json b/composer.json
index 72496cc..1c0023b 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
         "bringyourownideas/silverstripe-maintenance": "^4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^11.3",
         "squizlabs/php_codesniffer": "^3",
         "silverstripe/standards": "^1",
         "phpstan/extension-installer": "^1.3"
diff --git a/tests/Extensions/CheckComposerUpdatesExtensionTest.php b/tests/Extensions/CheckComposerUpdatesExtensionTest.php
index be33726..b4bf629 100644
--- a/tests/Extensions/CheckComposerUpdatesExtensionTest.php
+++ b/tests/Extensions/CheckComposerUpdatesExtensionTest.php
@@ -43,7 +43,7 @@ protected function setUp(): void
         $this->task = UpdatePackageInfoTask::create();
 
         // Create a partial mock of the update checker
-        $updateCheckerMock = $this->getMockBuilder(UpdateChecker::class)->setMethods(['checkForUpdates'])->getMock();
+        $updateCheckerMock = $this->getMockBuilder(UpdateChecker::class)->onlyMethods(['checkForUpdates'])->getMock();
         $this->task->setUpdateChecker($updateCheckerMock);
 
         $this->allowedTypes = ['silverstripe-module', 'silverstripe-vendormodule', 'silverstripe-theme'];
diff --git a/tests/UpdateCheckerTest.php b/tests/UpdateCheckerTest.php
index 53d662c..b13893f 100644
--- a/tests/UpdateCheckerTest.php
+++ b/tests/UpdateCheckerTest.php
@@ -25,14 +25,14 @@ protected function setUp(): void
         $composer = $this->getMockBuilder(Composer::class)->getMock();
         $composerLoader = $this->getMockBuilder(ComposerLoader::class)
             ->disableOriginalConstructor()
-            ->setMethods(['getComposer'])
+            ->onlyMethods(['getComposer'])
             ->getMock();
         $composerLoader->expects($this->once())->method('getComposer')->will($this->returnValue($composer));
         Injector::inst()->registerService($composerLoader, ComposerLoader::class);
 
         // Partially mock UpdateChecker
         $this->updateChecker = $this->getMockBuilder(UpdateChecker::class)
-            ->setMethods(['findLatestPackage'])
+            ->onlyMethods(['findLatestPackage'])
             ->getMock();
     }