diff --git a/composer.json b/composer.json
index 34787bd9..1c3ea632 100644
--- a/composer.json
+++ b/composer.json
@@ -19,10 +19,10 @@
         "akrabat/ip-address-middleware": "^1.0",
         "cakephp/chronos": "^1.2",
         "cocur/slugify": "^3.0",
-        "doctrine/cache": "^1.6",
-        "doctrine/dbal": "^2.9",
-        "doctrine/migrations": "^2.0",
-        "doctrine/orm": "^2.5",
+        "doctrine/cache": "^1.9",
+        "doctrine/dbal": "^2.10",
+        "doctrine/migrations": "^2.2",
+        "doctrine/orm": "^2.7",
         "endroid/qr-code": "^3.6",
         "firebase/php-jwt": "^4.0",
         "geoip2/geoip2": "^2.9",
diff --git a/module/Core/src/EventDispatcher/LocateShortUrlVisit.php b/module/Core/src/EventDispatcher/LocateShortUrlVisit.php
index 65026af0..1facba39 100644
--- a/module/Core/src/EventDispatcher/LocateShortUrlVisit.php
+++ b/module/Core/src/EventDispatcher/LocateShortUrlVisit.php
@@ -82,6 +82,6 @@ class LocateShortUrlVisit
         }
 
         $visit->locate(new VisitLocation($location));
-        $this->em->flush($visit);
+        $this->em->flush();
     }
 }
diff --git a/module/Core/src/Service/ShortUrlService.php b/module/Core/src/Service/ShortUrlService.php
index 1f3ea73a..02977186 100644
--- a/module/Core/src/Service/ShortUrlService.php
+++ b/module/Core/src/Service/ShortUrlService.php
@@ -64,9 +64,7 @@ class ShortUrlService implements ShortUrlServiceInterface
         $shortUrl = $this->findByShortCode($this->em, $shortCode);
         $shortUrl->updateMeta($shortUrlMeta);
 
-        /** @var ORM\EntityManager $em */
-        $em = $this->em;
-        $em->flush($shortUrl);
+        $this->em->flush();
 
         return $shortUrl;
     }
diff --git a/module/Core/src/Service/Tag/TagService.php b/module/Core/src/Service/Tag/TagService.php
index fd32efe5..d5ac562e 100644
--- a/module/Core/src/Service/Tag/TagService.php
+++ b/module/Core/src/Service/Tag/TagService.php
@@ -77,9 +77,7 @@ class TagService implements TagServiceInterface
 
         $tag->rename($newName);
 
-        /** @var ORM\EntityManager $em */
-        $em = $this->em;
-        $em->flush($tag);
+        $this->em->flush();
 
         return $tag;
     }
diff --git a/module/Core/src/Service/VisitsTracker.php b/module/Core/src/Service/VisitsTracker.php
index ebfdf778..12af69ce 100644
--- a/module/Core/src/Service/VisitsTracker.php
+++ b/module/Core/src/Service/VisitsTracker.php
@@ -43,10 +43,8 @@ class VisitsTracker implements VisitsTrackerInterface
 
         $visit = new Visit($shortUrl, $visitor);
 
-        /** @var ORM\EntityManager $em */
-        $em = $this->em;
-        $em->persist($visit);
-        $em->flush($visit);
+        $this->em->persist($visit);
+        $this->em->flush();
 
         $this->eventDispatcher->dispatch(new ShortUrlVisited($visit->getId()));
     }
diff --git a/module/Core/test/EventDispatcher/LocateShortUrlVisitTest.php b/module/Core/test/EventDispatcher/LocateShortUrlVisitTest.php
index 14318749..0b557dd8 100644
--- a/module/Core/test/EventDispatcher/LocateShortUrlVisitTest.php
+++ b/module/Core/test/EventDispatcher/LocateShortUrlVisitTest.php
@@ -61,7 +61,7 @@ class LocateShortUrlVisitTest extends TestCase
         ($this->locateVisit)($event);
 
         $findVisit->shouldHaveBeenCalledOnce();
-        $this->em->flush(Argument::cetera())->shouldNotHaveBeenCalled();
+        $this->em->flush()->shouldNotHaveBeenCalled();
         $this->ipLocationResolver->resolveIpLocation(Argument::cetera())->shouldNotHaveBeenCalled();
         $logWarning->shouldHaveBeenCalled();
     }
@@ -86,7 +86,7 @@ class LocateShortUrlVisitTest extends TestCase
         $findVisit->shouldHaveBeenCalledOnce();
         $resolveLocation->shouldHaveBeenCalledOnce();
         $logWarning->shouldHaveBeenCalled();
-        $this->em->flush(Argument::cetera())->shouldNotHaveBeenCalled();
+        $this->em->flush()->shouldNotHaveBeenCalled();
     }
 
     /**
@@ -97,7 +97,7 @@ class LocateShortUrlVisitTest extends TestCase
     {
         $event = new ShortUrlVisited('123');
         $findVisit = $this->em->find(Visit::class, '123')->willReturn($visit);
-        $flush = $this->em->flush($visit)->will(function () {
+        $flush = $this->em->flush()->will(function () {
         });
         $resolveIp = $this->ipLocationResolver->resolveIpLocation(Argument::any());
 
@@ -128,7 +128,7 @@ class LocateShortUrlVisitTest extends TestCase
         $event = new ShortUrlVisited('123');
 
         $findVisit = $this->em->find(Visit::class, '123')->willReturn($visit);
-        $flush = $this->em->flush($visit)->will(function () {
+        $flush = $this->em->flush()->will(function () {
         });
         $resolveIp = $this->ipLocationResolver->resolveIpLocation($ipAddr)->willReturn($location);
 
@@ -151,7 +151,7 @@ class LocateShortUrlVisitTest extends TestCase
         $event = new ShortUrlVisited('123');
 
         $findVisit = $this->em->find(Visit::class, '123')->willReturn($visit);
-        $flush = $this->em->flush($visit)->will(function () {
+        $flush = $this->em->flush()->will(function () {
         });
         $resolveIp = $this->ipLocationResolver->resolveIpLocation($ipAddr)->willReturn($location);
         $checkUpdateDb = $this->dbUpdater->checkDbUpdate(Argument::cetera())->willThrow($e);
@@ -179,7 +179,7 @@ class LocateShortUrlVisitTest extends TestCase
         $event = new ShortUrlVisited('123');
 
         $findVisit = $this->em->find(Visit::class, '123')->willReturn($visit);
-        $flush = $this->em->flush($visit)->will(function () {
+        $flush = $this->em->flush()->will(function () {
         });
         $resolveIp = $this->ipLocationResolver->resolveIpLocation($ipAddr)->willReturn($location);
         $checkUpdateDb = $this->dbUpdater->checkDbUpdate(Argument::cetera())->willThrow($e);
diff --git a/module/Core/test/Service/ShortUrlServiceTest.php b/module/Core/test/Service/ShortUrlServiceTest.php
index 9fd19394..07628f7c 100644
--- a/module/Core/test/Service/ShortUrlServiceTest.php
+++ b/module/Core/test/Service/ShortUrlServiceTest.php
@@ -35,7 +35,7 @@ class ShortUrlServiceTest extends TestCase
     }
 
     /** @test */
-    public function listedUrlsAreReturnedFromEntityManager()
+    public function listedUrlsAreReturnedFromEntityManager(): void
     {
         $list = [
             new ShortUrl(''),
@@ -54,7 +54,7 @@ class ShortUrlServiceTest extends TestCase
     }
 
     /** @test */
-    public function exceptionIsThrownWhenSettingTagsOnInvalidShortcode()
+    public function exceptionIsThrownWhenSettingTagsOnInvalidShortcode(): void
     {
         $shortCode = 'abc123';
         $repo = $this->prophesize(ShortUrlRepository::class);
@@ -67,7 +67,7 @@ class ShortUrlServiceTest extends TestCase
     }
 
     /** @test */
-    public function providedTagsAreGetFromRepoAndSetToTheShortUrl()
+    public function providedTagsAreGetFromRepoAndSetToTheShortUrl(): void
     {
         $shortUrl = $this->prophesize(ShortUrl::class);
         $shortUrl->setTags(Argument::any())->shouldBeCalledOnce();
@@ -86,14 +86,14 @@ class ShortUrlServiceTest extends TestCase
     }
 
     /** @test */
-    public function updateMetadataByShortCodeUpdatesProvidedData()
+    public function updateMetadataByShortCodeUpdatesProvidedData(): void
     {
         $shortUrl = new ShortUrl('');
 
         $repo = $this->prophesize(ShortUrlRepository::class);
         $findShortUrl = $repo->findOneBy(['shortCode' => 'abc123'])->willReturn($shortUrl);
         $getRepo = $this->em->getRepository(ShortUrl::class)->willReturn($repo->reveal());
-        $flush = $this->em->flush($shortUrl)->willReturn(null);
+        $flush = $this->em->flush()->willReturn(null);
 
         $result = $this->service->updateMetadataByShortCode('abc123', ShortUrlMeta::createFromParams(
             Chronos::parse('2017-01-01 00:00:00')->toAtomString(),
diff --git a/module/Core/test/Service/Tag/TagServiceTest.php b/module/Core/test/Service/Tag/TagServiceTest.php
index 7670eafd..0dd63ff5 100644
--- a/module/Core/test/Service/Tag/TagServiceTest.php
+++ b/module/Core/test/Service/Tag/TagServiceTest.php
@@ -28,7 +28,7 @@ class TagServiceTest extends TestCase
     }
 
     /** @test */
-    public function listTagsDelegatesOnRepository()
+    public function listTagsDelegatesOnRepository(): void
     {
         $expected = [new Tag('foo'), new Tag('bar')];
 
@@ -44,7 +44,7 @@ class TagServiceTest extends TestCase
     }
 
     /** @test */
-    public function deleteTagsDelegatesOnRepository()
+    public function deleteTagsDelegatesOnRepository(): void
     {
         $repo = $this->prophesize(TagRepository::class);
         $delete = $repo->deleteByName(['foo', 'bar'])->willReturn(4);
@@ -57,7 +57,7 @@ class TagServiceTest extends TestCase
     }
 
     /** @test */
-    public function createTagsPersistsEntities()
+    public function createTagsPersistsEntities(): void
     {
         $repo = $this->prophesize(TagRepository::class);
         $find = $repo->findOneBy(Argument::cetera())->willReturn(new Tag('foo'));
@@ -75,7 +75,7 @@ class TagServiceTest extends TestCase
     }
 
     /** @test */
-    public function renameInvalidTagThrowsException()
+    public function renameInvalidTagThrowsException(): void
     {
         $repo = $this->prophesize(TagRepository::class);
         $find = $repo->findOneBy(Argument::cetera())->willReturn(null);
@@ -89,14 +89,14 @@ class TagServiceTest extends TestCase
     }
 
     /** @test */
-    public function renameValidTagChangesItsName()
+    public function renameValidTagChangesItsName(): void
     {
         $expected = new Tag('foo');
 
         $repo = $this->prophesize(TagRepository::class);
         $find = $repo->findOneBy(Argument::cetera())->willReturn($expected);
         $getRepo = $this->em->getRepository(Tag::class)->willReturn($repo->reveal());
-        $flush = $this->em->flush($expected)->willReturn(null);
+        $flush = $this->em->flush()->willReturn(null);
 
         $tag = $this->service->renameTag('foo', 'bar');
 
diff --git a/module/Core/test/Service/VisitsTrackerTest.php b/module/Core/test/Service/VisitsTrackerTest.php
index f137fd54..a59429fb 100644
--- a/module/Core/test/Service/VisitsTrackerTest.php
+++ b/module/Core/test/Service/VisitsTrackerTest.php
@@ -46,11 +46,11 @@ class VisitsTrackerTest extends TestCase
         $repo->findOneBy(['shortCode' => $shortCode])->willReturn(new ShortUrl(''));
 
         $this->em->getRepository(ShortUrl::class)->willReturn($repo->reveal())->shouldBeCalledOnce();
-        $this->em->persist(Argument::any())->shouldBeCalledOnce();
-        $this->em->flush(Argument::that(function (Visit $visit) {
+        $this->em->persist(Argument::that(function (Visit $visit) {
             $visit->setId('1');
             return $visit;
         }))->shouldBeCalledOnce();
+        $this->em->flush()->shouldBeCalledOnce();
 
         $this->visitsTracker->track($shortCode, Visitor::emptyInstance());
 
@@ -69,11 +69,10 @@ class VisitsTrackerTest extends TestCase
             /** @var Visit $visit */
             $visit = $args[0];
             Assert::assertEquals('4.3.2.0', $visit->getRemoteAddr());
-        })->shouldBeCalledOnce();
-        $this->em->flush(Argument::that(function (Visit $visit) {
             $visit->setId('1');
             return $visit;
-        }))->shouldBeCalledOnce();
+        })->shouldBeCalledOnce();
+        $this->em->flush()->shouldBeCalledOnce();
 
         $this->visitsTracker->track($shortCode, new Visitor('', '', '4.3.2.1'));
 
diff --git a/phpstan.neon b/phpstan.neon
index 8b5db673..7df6d88f 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,7 +1,6 @@
 parameters:
 	ignoreErrors:
 		- '#is not subtype of Throwable#'
-		- '#ObjectManager::flush()#'
 		- '#Undefined variable: \$metadata#'
 		- '#AbstractQuery::setParameters()#'
 		- '#mustRun()#'