diff --git a/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php b/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
index 3b2334c426085..c1fab03b5172d 100644
--- a/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
@@ -2519,7 +2519,7 @@ public function testAddBulletListMaintainsHtmlProperties(): void {
 		$actualHtmlValues = [];
 		$template
 			->method('addBodyListItem')
-			->willReturnCallback(function (string $html) use (&$actualHtmlValues) {
+			->willReturnCallback(function (string $html) use (&$actualHtmlValues): void {
 				$actualHtmlValues[] = $html;
 			});
 
@@ -2558,7 +2558,7 @@ public function testAddBulletListEscapesNonHtmlProperties(): void {
 		$actualHtmlValues = [];
 		$template
 			->method('addBodyListItem')
-			->willReturnCallback(function (string $html) use (&$actualHtmlValues) {
+			->willReturnCallback(function (string $html) use (&$actualHtmlValues): void {
 				$actualHtmlValues[] = $html;
 			});
 
diff --git a/apps/dav/tests/unit/CardDAV/SyncServiceTest.php b/apps/dav/tests/unit/CardDAV/SyncServiceTest.php
index 630d61672ee94..e76d5d929f83b 100644
--- a/apps/dav/tests/unit/CardDAV/SyncServiceTest.php
+++ b/apps/dav/tests/unit/CardDAV/SyncServiceTest.php
@@ -303,12 +303,12 @@ public function testFullSyncWithOrphanElement(): void {
 			->method('createCard');
 		$this->backend->expects($this->exactly(1))
 			->method('updateCard')
-			->willReturnCallback(function ($id, $uri) use (&$pendingCards) {
+			->willReturnCallback(function ($id, $uri) use (&$pendingCards): void {
 				unset($pendingCards[$uri]);
 			});
 		$this->backend->expects($this->exactly(1))
 			->method('markCardsAsPending')
-			->willReturnCallback(function ($id) use (&$pendingCards) {
+			->willReturnCallback(function ($id) use (&$pendingCards): void {
 				$cards = array_values($this->backend->getCards($id));
 				$uris = array_map(fn ($card) => $card['uri'], $cards);
 				$pendingCards = array_combine($uris, $cards);
diff --git a/apps/files_sharing/lib/Listener/SharesUpdatedListener.php b/apps/files_sharing/lib/Listener/SharesUpdatedListener.php
index 9cb3740671051..2e07438eebb29 100644
--- a/apps/files_sharing/lib/Listener/SharesUpdatedListener.php
+++ b/apps/files_sharing/lib/Listener/SharesUpdatedListener.php
@@ -91,7 +91,7 @@ public function handle(Event $event): void {
 				}
 
 				if ($share->getSharedBy() !== $user->getUID()) {
-					$this->markOrRun($user, function () use ($user, $share) {
+					$this->markOrRun($user, function () use ($user, $share): void {
 						$this->shareUpdater->updateForAddedShare($user, $share);
 					});
 					// Share target validation might have changed the target, restore it for the next user
@@ -105,7 +105,7 @@ public function handle(Event $event): void {
 
 			// don't trigger if the share is moved as part of the conflict resolution
 			if (!$this->shareUpdater->isInUpdate($user)) {
-				$this->markOrRun($user, function () use ($user, $share) {
+				$this->markOrRun($user, function () use ($user, $share): void {
 					$this->shareUpdater->updateForMovedShare($user, $share);
 				});
 			}
@@ -117,7 +117,7 @@ public function handle(Event $event): void {
 					continue;
 				}
 
-				$this->markOrRun($user, function () use ($user, $share) {
+				$this->markOrRun($user, function () use ($user, $share): void {
 					$this->shareUpdater->updateForDeletedShare($user, $share);
 				});
 			}
@@ -138,7 +138,7 @@ private function markOrRun(IUser $user, callable $callback): void {
 	}
 
 	private function updateOrMarkUser(IUser $user): void {
-		$this->markOrRun($user, function () use ($user) {
+		$this->markOrRun($user, function () use ($user): void {
 			$this->shareUpdater->updateForUser($user);
 		});
 	}
diff --git a/apps/files_sharing/tests/SharesUpdatedListenerTest.php b/apps/files_sharing/tests/SharesUpdatedListenerTest.php
index 3598f6cfb5b09..ec27bfdb08b75 100644
--- a/apps/files_sharing/tests/SharesUpdatedListenerTest.php
+++ b/apps/files_sharing/tests/SharesUpdatedListenerTest.php
@@ -84,7 +84,7 @@ public function testShareAdded() {
 		$this->shareRecipientUpdater
 			->expects($this->exactly(2))
 			->method('updateForAddedShare')
-			->willReturnCallback(function (IUser $user, IShare $eventShare) use ($user1, $user2, $share) {
+			->willReturnCallback(function (IUser $user, IShare $eventShare) use ($user1, $user2, $share): void {
 				$this->assertContains($user, [$user1, $user2]);
 				$this->assertEquals($share, $eventShare);
 			});
@@ -107,7 +107,7 @@ public function testShareAddedFilterOwner() {
 		$this->shareRecipientUpdater
 			->expects($this->exactly(1))
 			->method('updateForAddedShare')
-			->willReturnCallback(function (IUser $user, IShare $eventShare) use ($user2, $share) {
+			->willReturnCallback(function (IUser $user, IShare $eventShare) use ($user2, $share): void {
 				$this->assertEquals($user, $user2);
 				$this->assertEquals($share, $eventShare);
 			});
@@ -124,7 +124,7 @@ public function testShareAccessUpdated() {
 		$this->shareRecipientUpdater
 			->expects($this->exactly(2))
 			->method('updateForUser')
-			->willReturnCallback(function (IUser $user) use ($user1, $user2) {
+			->willReturnCallback(function (IUser $user) use ($user1, $user2): void {
 				$this->assertContains($user, [$user1, $user2]);
 			});
 
@@ -144,7 +144,7 @@ public function testShareDeleted() {
 		$this->shareRecipientUpdater
 			->expects($this->exactly(2))
 			->method('updateForDeletedShare')
-			->willReturnCallback(function (IUser $user) use ($user1, $user2, $share) {
+			->willReturnCallback(function (IUser $user) use ($user1, $user2, $share): void {
 				$this->assertContains($user, [$user1, $user2]);
 			});
 
diff --git a/build/integration/features/bootstrap/Sharing.php b/build/integration/features/bootstrap/Sharing.php
index 4aca7ae697c2d..4a12fbe5cc43a 100644
--- a/build/integration/features/bootstrap/Sharing.php
+++ b/build/integration/features/bootstrap/Sharing.php
@@ -5,9 +5,9 @@
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-
 use Behat\Gherkin\Node\TableNode;
 use GuzzleHttp\Client;
+use OCA\Files_Sharing\MountProvider;
 use PHPUnit\Framework\Assert;
 use Psr\Http\Message\ResponseInterface;
 
@@ -805,7 +805,7 @@ public function checkShareMounts(string $user, ?TableNode $body) {
 			}
 			$this->runOcc(['files:mount:list', '--output', 'json', '--cached-only', $user]);
 			$mounts = json_decode($this->lastStdOut, true)['cached'];
-			$shareMounts = array_filter($mounts, fn (array $data) => $data['provider'] === \OCA\Files_Sharing\MountProvider::class);
+			$shareMounts = array_filter($mounts, fn (array $data) => $data['provider'] === MountProvider::class);
 			$actual = array_values(array_map(fn (array $data) => $data['mountpoint'], $shareMounts));
 			Assert::assertEquals($expected, $actual);
 		}
@@ -817,7 +817,7 @@ public function checkShareMounts(string $user, ?TableNode $body) {
 	public function checkShareMountsEmpty(string $user) {
 		$this->runOcc(['files:mount:list', '--output', 'json', '--cached-only', $user]);
 		$mounts = json_decode($this->lastStdOut, true)['cached'];
-		$shareMounts = array_filter($mounts, fn (array $data) => $data['provider'] === \OCA\Files_Sharing\MountProvider::class);
+		$shareMounts = array_filter($mounts, fn (array $data) => $data['provider'] === MountProvider::class);
 		$actual = array_values(array_map(fn (array $data) => $data['mountpoint'], $shareMounts));
 		Assert::assertEquals([], $actual);
 	}