diff --git a/lib/Subscribers/SubscribersRepository.php b/lib/Subscribers/SubscribersRepository.php
index 0fb970434d..4d798622f2 100644
--- a/lib/Subscribers/SubscribersRepository.php
+++ b/lib/Subscribers/SubscribersRepository.php
@@ -18,6 +18,9 @@ use MailPoetVendor\Doctrine\ORM\Query\Expr\Join;
  * @extends Repository<SubscriberEntity>
  */
 class SubscribersRepository extends Repository {
+  /** @var WPFunctions */
+  private $wp;
+
   protected $ignoreColumnsForUpdate = [
     'wp_user_id',
     'is_woocommerce_user',
@@ -26,6 +29,11 @@ class SubscribersRepository extends Repository {
     'last_subscribed_at',
   ];
 
+  public function __construct(EntityManager $entityManager, WPFunctions $wp) {
+    $this->wp = $wp;
+    parent::__construct($entityManager);
+  }
+
   protected function getEntityClassName() {
     return SubscriberEntity::class;
   }
@@ -312,12 +320,13 @@ class SubscribersRepository extends Repository {
     if ($userAgent instanceof UserAgentEntity && $userAgent->getUserAgentType() === UserAgentEntity::USER_AGENT_TYPE_MACHINE) {
       return;
     }
+    $now = Carbon::createFromTimestamp((int)$this->wp->currentTime('timestamp'));
     // Do not update engagement if was recently updated to avoid unnecessary updates in DB
-    if ($subscriberEntity->getLastEngagementAt() && $subscriberEntity->getLastEngagementAt() > Carbon::now()->subMinute()) {
+    if ($subscriberEntity->getLastEngagementAt() && $subscriberEntity->getLastEngagementAt() > $now->subMinute()) {
       return;
     }
     // Update last engagement for human (and also unknown) user agent
-    $subscriberEntity->setLastEngagementAt(Carbon::now());
+    $subscriberEntity->setLastEngagementAt($now);
     $this->flush();
   }
 }
diff --git a/tests/integration/Statistics/Track/ClicksTest.php b/tests/integration/Statistics/Track/ClicksTest.php
index 93c412c728..60c06710a7 100644
--- a/tests/integration/Statistics/Track/ClicksTest.php
+++ b/tests/integration/Statistics/Track/ClicksTest.php
@@ -26,6 +26,7 @@ use MailPoet\Subscribers\LinkTokens;
 use MailPoet\Subscribers\SubscribersRepository;
 use MailPoet\Tasks\Sending as SendingTask;
 use MailPoet\Util\Cookies;
+use MailPoet\WP\Functions as WPFunctions;
 use MailPoetVendor\Carbon\Carbon;
 
 class ClicksTest extends \MailPoetTest {
@@ -482,7 +483,11 @@ class ClicksTest extends \MailPoetTest {
   }
 
   public function testItUpdatesSubscriberEngagementForHumanAgent() {
-    Carbon::setTestNow($now = Carbon::now());
+    $now = Carbon::now();
+    $wpMock = $this->createMock(WPFunctions::class);
+    $wpMock->expects($this->once())
+      ->method('currentTime')
+      ->willReturn($now->getTimestamp());
     $clicksRepository = $this->diContainer->get(StatisticsClicksRepository::class);
     $data = $this->trackData;
     $data->userAgent = 'User Agent';
@@ -494,17 +499,22 @@ class ClicksTest extends \MailPoetTest {
       $clicksRepository,
       $this->diContainer->get(UserAgentsRepository::class),
       $this->diContainer->get(LinkShortcodeCategory::class),
-      $this->diContainer->get(SubscribersRepository::class),
+      new SubscribersRepository($this->entityManager, $wpMock),
     ], [
       'redirectToUrl' => null,
     ], $this);
     $clicks->track($data);
-    expect($this->subscriber->getLastEngagementAt())->equals($now);
-    Carbon::setTestNow();
+    $savedEngagementTime = $this->subscriber->getLastEngagementAt();
+    $this->assertInstanceOf(\DateTimeInterface::class, $savedEngagementTime);
+    expect($savedEngagementTime->getTimestamp())->equals($now->getTimestamp());
   }
 
   public function testItUpdatesSubscriberEngagementForUnknownAgent() {
-    Carbon::setTestNow($now = Carbon::now());
+    $now = Carbon::now();
+    $wpMock = $this->createMock(WPFunctions::class);
+    $wpMock->expects($this->once())
+      ->method('currentTime')
+      ->willReturn($now->getTimestamp());
     $clicksRepository = $this->diContainer->get(StatisticsClicksRepository::class);
     $data = $this->trackData;
     $data->userAgent = null;
@@ -516,13 +526,14 @@ class ClicksTest extends \MailPoetTest {
       $clicksRepository,
       $this->diContainer->get(UserAgentsRepository::class),
       $this->diContainer->get(LinkShortcodeCategory::class),
-      $this->diContainer->get(SubscribersRepository::class),
+      new SubscribersRepository($this->entityManager, $wpMock),
     ], [
       'redirectToUrl' => null,
     ], $this);
     $clicks->track($data);
-    expect($this->subscriber->getLastEngagementAt())->equals($now);
-    Carbon::setTestNow();
+    $savedEngagementTime = $this->subscriber->getLastEngagementAt();
+    $this->assertInstanceOf(\DateTimeInterface::class, $savedEngagementTime);
+    expect($savedEngagementTime->getTimestamp())->equals($now->getTimestamp());
   }
 
   public function testItWontUpdateSubscriberEngagementForMachineAgent() {
diff --git a/tests/integration/Statistics/Track/OpensTest.php b/tests/integration/Statistics/Track/OpensTest.php
index 97adafa793..3d79d09301 100644
--- a/tests/integration/Statistics/Track/OpensTest.php
+++ b/tests/integration/Statistics/Track/OpensTest.php
@@ -17,6 +17,7 @@ use MailPoet\Statistics\UserAgentsRepository;
 use MailPoet\Subscribers\LinkTokens;
 use MailPoet\Subscribers\SubscribersRepository;
 use MailPoet\Tasks\Sending as SendingTask;
+use MailPoet\WP\Functions as WPFunctions;
 use MailPoetVendor\Carbon\Carbon;
 
 class OpensTest extends \MailPoetTest {
@@ -358,35 +359,45 @@ class OpensTest extends \MailPoetTest {
   }
 
   public function testItUpdatesSubscriberEngagementForHumanAgent() {
-    Carbon::setTestNow($now = Carbon::now());
+    $now = Carbon::now();
+    $wpMock = $this->createMock(WPFunctions::class);
+    $wpMock->expects($this->once())
+      ->method('currentTime')
+      ->willReturn($now->getTimestamp());
     $this->trackData->userAgent = 'User agent';
     $opens = Stub::construct($this->opens, [
       $this->diContainer->get(StatisticsOpensRepository::class),
       $this->diContainer->get(UserAgentsRepository::class),
-      $this->diContainer->get(SubscribersRepository::class),
+      new SubscribersRepository($this->entityManager, $wpMock),
     ], [
       'returnResponse' => null,
     ], $this);
 
     $opens->track($this->trackData);
-    expect($this->subscriber->getLastEngagementAt())->equals($now);
-    Carbon::setTestNow();
+    $savedEngagementTime = $this->subscriber->getLastEngagementAt();
+    $this->assertInstanceOf(\DateTimeInterface::class, $savedEngagementTime);
+    expect($savedEngagementTime->getTimestamp())->equals($now->getTimestamp());
   }
 
-  public function testItUpdatesSubscriberEngagementFoUnknownAgent() {
-    Carbon::setTestNow($now = Carbon::now());
+  public function testItUpdatesSubscriberEngagementForUnknownAgent() {
+    $now = Carbon::now();
+    $wpMock = $this->createMock(WPFunctions::class);
+    $wpMock->expects($this->once())
+      ->method('currentTime')
+      ->willReturn($now->getTimestamp());
     $this->trackData->userAgent = null;
     $opens = Stub::construct($this->opens, [
       $this->diContainer->get(StatisticsOpensRepository::class),
       $this->diContainer->get(UserAgentsRepository::class),
-      $this->diContainer->get(SubscribersRepository::class),
+      new SubscribersRepository($this->entityManager, $wpMock),
     ], [
       'returnResponse' => null,
     ], $this);
 
     $opens->track($this->trackData);
-    expect($this->subscriber->getLastEngagementAt())->equals($now);
-    Carbon::setTestNow();
+    $savedEngagementTime = $this->subscriber->getLastEngagementAt();
+    $this->assertInstanceOf(\DateTimeInterface::class, $savedEngagementTime);
+    expect($savedEngagementTime->getTimestamp())->equals($now->getTimestamp());
   }
 
   public function testItWontUpdateSubscriberEngagementForMachineAgent() {
diff --git a/tests/integration/WooCommerce/SubscriberEngagementTest.php b/tests/integration/WooCommerce/SubscriberEngagementTest.php
index ba174cae38..5cd8069c08 100644
--- a/tests/integration/WooCommerce/SubscriberEngagementTest.php
+++ b/tests/integration/WooCommerce/SubscriberEngagementTest.php
@@ -4,12 +4,16 @@ namespace MailPoet\WooCommerce;
 
 use MailPoet\Entities\SubscriberEntity;
 use MailPoet\Subscribers\SubscribersRepository;
+use MailPoet\WP\Functions as WPFunctions;
 use MailPoetVendor\Carbon\Carbon;
 use PHPUnit\Framework\MockObject\MockObject;
 use WC_Order;
 
 class SubscriberEngagementTest extends \MailPoetTest {
 
+  /** @var WPFunctions & MockObject */
+  private $wpMock;
+
   /** @var Helper & MockObject */
   private $wooCommerceHelperMock;
 
@@ -18,15 +22,19 @@ class SubscriberEngagementTest extends \MailPoetTest {
 
   public function _before() {
     $this->wooCommerceHelperMock = $this->createMock(Helper::class);
+    $this->wpMock = $this->createMock(WPFunctions::class);
     $this->subscriberEngagement = new SubscriberEngagement(
       $this->wooCommerceHelperMock,
-      $this->diContainer->get(SubscribersRepository::class)
+      new SubscribersRepository($this->entityManager, $this->wpMock)
     );
     $this->truncateEntity(SubscriberEntity::class);
   }
 
   public function testItUpdatesLastEngagementForSubscriberWhoCreatedNewOrder() {
-    Carbon::setTestNow($now = new Carbon('2021-08-31 13:13:00'));
+    $now = new Carbon('2021-08-31 13:13:00');
+    $this->wpMock->expects($this->once())
+      ->method('currentTime')
+      ->willReturn($now->getTimestamp());
     $subscriber = $this->createSubscriber();
     $order = $this->createOrderMock($subscriber->getEmail());
     $this->wooCommerceHelperMock
@@ -36,7 +44,6 @@ class SubscriberEngagementTest extends \MailPoetTest {
     $this->subscriberEngagement->updateSubscriberEngagement(1);
     $this->entityManager->refresh($subscriber);
     expect($subscriber->getLastEngagementAt())->equals($now);
-    Carbon::setTestNow();
   }
 
   public function testItDoesntUpdateAnythingForNonExistingOder() {