diff --git a/src/Representation/OrganizationDomain.php b/src/Representation/OrganizationDomain.php
index 8e93ba9..c52a44e 100644
--- a/src/Representation/OrganizationDomain.php
+++ b/src/Representation/OrganizationDomain.php
@@ -6,6 +6,12 @@
 
 /**
  * @codeCoverageIgnore
+ *
+ * @method string|null getName()
+ * @method self withName(?string $name)
+ *
+ * @method bool|null getVerified()
+ * @method self withVerified(?bool $verified)
  */
 class OrganizationDomain extends Representation
 {
diff --git a/src/Resource/Organizations.php b/src/Resource/Organizations.php
index fd96314..0cfbf26 100644
--- a/src/Resource/Organizations.php
+++ b/src/Resource/Organizations.php
@@ -49,6 +49,21 @@ public function create(string $realm, Organization $organization): void
         );
     }
 
+    public function update(string $realm, string $id, Organization $organization): void
+    {
+        $this->commandExecutor->executeCommand(
+            new Command(
+                '/admin/realms/{realm}/organizations/{id}',
+                Method::PUT,
+                [
+                    'realm' => $realm,
+                    'id' => $id,
+                ],
+                $organization,
+            ),
+        );
+    }
+
     public function delete(string $realm, string $id): void
     {
         $this->commandExecutor->executeCommand(
diff --git a/tests/Integration/IntegrationTestBehaviour.php b/tests/Integration/IntegrationTestBehaviour.php
index f13cb66..33ab92a 100644
--- a/tests/Integration/IntegrationTestBehaviour.php
+++ b/tests/Integration/IntegrationTestBehaviour.php
@@ -8,31 +8,31 @@
 
 trait IntegrationTestBehaviour
 {
-    private ?Keycloak $keycloak = null;
+    private static ?Keycloak $keycloak = null;
 
-    public function getKeycloak(): Keycloak
+    public static function getKeycloak(): Keycloak
     {
-        if (!$this->keycloak) {
-            $this->keycloak = new Keycloak(
+        if (!self::$keycloak) {
+            self::$keycloak = new Keycloak(
                 $_SERVER['KEYCLOAK_BASE_URL'] ?? 'http://keycloak:8080',
                 'admin',
                 'admin',
             );
         }
 
-        return $this->keycloak;
+        return self::$keycloak;
     }
 
     protected function skipIfKeycloakVersionIsLessThan(string $version): void
     {
-        if (version_compare($this->getKeycloak()->getVersion(), $version, '<')) {
+        if (version_compare(self::getKeycloak()->getVersion(), $version, '<')) {
             $this->markTestSkipped(sprintf('Keycloak version is less than %s', $version));
         }
     }
 
     protected function skipIfKeycloakVersionIsGreaterThan(string $version): void
     {
-        if (version_compare($this->getKeycloak()->getVersion(), $version, '>')) {
+        if (version_compare(self::getKeycloak()->getVersion(), $version, '>')) {
             $this->markTestSkipped(sprintf('Keycloak version is greater than %s', $version));
         }
     }
diff --git a/tests/Integration/Resource/GroupsTest.php b/tests/Integration/Resource/GroupsTest.php
index 8eeba2a..b0ee4b2 100644
--- a/tests/Integration/Resource/GroupsTest.php
+++ b/tests/Integration/Resource/GroupsTest.php
@@ -7,6 +7,7 @@
 use Exception;
 use Fschmtt\Keycloak\Http\Criteria;
 use Fschmtt\Keycloak\Representation\Group;
+use Fschmtt\Keycloak\Representation\Realm;
 use Fschmtt\Keycloak\Test\Integration\IntegrationTestBehaviour;
 use PHPUnit\Framework\TestCase;
 use Ramsey\Uuid\Uuid;
@@ -15,6 +16,18 @@ class GroupsTest extends TestCase
 {
     use IntegrationTestBehaviour;
 
+    private const REALM = 'groups-test';
+
+    public static function setUpBeforeClass(): void
+    {
+        self::getKeycloak()->realms()->import(new Realm(realm: self::REALM));
+    }
+
+    public static function tearDownAfterClass(): void
+    {
+        self::getKeycloak()->realms()->delete(self::REALM);
+    }
+
     public function testImportSearchUpdateDeleteGroup(): void
     {
         $groups = $this->getKeycloak()->groups();
@@ -23,32 +36,29 @@ public function testImportSearchUpdateDeleteGroup(): void
         $updatedGroupName = Uuid::uuid4()->toString();
 
         // Create group
-        $groups->create(
-            'master',
-            new Group(name: $importedGroupName),
-        );
+        $groups->create(self::REALM, new Group(name: $importedGroupName));
 
         // Get all groups
-        $allGroups = $groups->all('master');
+        $allGroups = $groups->all(self::REALM);
         static::assertGreaterThanOrEqual(1, $allGroups->count());
         $group = $allGroups->first();
         static::assertInstanceOf(Group::class, $group);
 
         // Search for single (imported) group
-        $importedGroup = $groups->all('master', new Criteria([
+        $importedGroup = $groups->all(self::REALM, new Criteria([
             'name' => $importedGroupName,
         ]))->first();
         static::assertInstanceOf(Group::class, $importedGroup);
         static::assertSame($importedGroupName, $importedGroup->getName());
 
         // Update (imported) group
-        $groups->update('master', $importedGroup->getId(), $importedGroup->withName($updatedGroupName));
+        $groups->update(self::REALM, $importedGroup->getId(), $importedGroup->withName($updatedGroupName));
 
         // Delete (imported) user
-        $groups->delete('master', $importedGroup->getId());
+        $groups->delete(self::REALM, $importedGroup->getId());
 
         try {
-            $groups->get('master', $importedGroup->getId());
+            $groups->get(self::REALM, $importedGroup->getId());
             static::fail('Group should not exist anymore');
         } catch (Exception $e) {
             static::assertSame(404, $e->getCode());
@@ -65,13 +75,13 @@ public function testCreateChildGroup(): void
         $groups = $this->getKeycloak()->groups();
 
         // Create group
-        $groups->create('master', new Group(name: $importedGroupName));
-        $group = $groups->all('master')->first();
+        $groups->create(self::REALM, new Group(name: $importedGroupName));
+        $group = $groups->all(self::REALM)->first();
         static::assertInstanceOf(Group::class, $group);
 
         // Create child group
-        $groups->createChild('master', new Group(name: $childGroupName), $group->getId());
-        $childGroups = $groups->children('master', $group->getId());
+        $groups->createChild(self::REALM, new Group(name: $childGroupName), $group->getId());
+        $childGroups = $groups->children(self::REALM, $group->getId());
         static::assertCount(1, $childGroups);
 
         $childGroup = $childGroups->first();
@@ -79,7 +89,7 @@ public function testCreateChildGroup(): void
         static::assertSame($childGroupName, $childGroup->getName());
 
         // get child group by path
-        $pathGroup = $groups->byPath('master', $importedGroupName . '/' . $childGroupName);
+        $pathGroup = $groups->byPath(self::REALM, $importedGroupName . '/' . $childGroupName);
         static::assertInstanceOf(Group::class, $pathGroup);
         static::assertSame($childGroup->getId(), $pathGroup->getId());
     }
diff --git a/tests/Integration/Resource/OrganizationsTest.php b/tests/Integration/Resource/OrganizationsTest.php
index 8c57660..7d918b2 100644
--- a/tests/Integration/Resource/OrganizationsTest.php
+++ b/tests/Integration/Resource/OrganizationsTest.php
@@ -19,7 +19,7 @@ class OrganizationsTest extends TestCase
 {
     use IntegrationTestBehaviour;
 
-    private const REALM = 'organizations-tests';
+    private const REALM = 'organizations-test';
 
     protected function setUp(): void
     {
@@ -74,6 +74,22 @@ public function testOrganizations(): void
         // Create user and add it to the organization
         $this->getKeycloak()->organizations()->addUser(self::REALM, $organization->getId(), $this->createAndGetUser()->getId());
 
+        // Update organization
+        $updatedOrganization = $organization->withDomains(new OrganizationDomainCollection([
+            new OrganizationDomain('foo.bar.updated', true),
+            new OrganizationDomain('bar.foo.updated', false),
+        ]));
+        $this->getKeycloak()->organizations()->update(self::REALM, $organization->getId(), $updatedOrganization);
+        $organizations = $this->getKeycloak()->organizations()->all(self::REALM);
+        static::assertCount(1, $organizations);
+        static::assertSame($updatedOrganization->getName(), $organizations->first()->getName());
+        $domains = $organizations->first()->getDomains();
+        static::assertCount(2, $domains);
+        static::assertSame([
+            'foo.bar.updated',
+            'bar.foo.updated',
+        ], array_map(static fn (OrganizationDomain $domain) => $domain->getName(), $domains->all()));
+
         // Delete newly created organization
         $this->getKeycloak()->organizations()->delete(self::REALM, $organizations->first()->getId());
         $organizations = $this->getKeycloak()->organizations()->all(self::REALM);
diff --git a/tests/Integration/Resource/RealmsTest.php b/tests/Integration/Resource/RealmsTest.php
index 83c3674..c2441ce 100644
--- a/tests/Integration/Resource/RealmsTest.php
+++ b/tests/Integration/Resource/RealmsTest.php
@@ -43,7 +43,7 @@ public function testCanUpdateRealm(): void
         static::assertFalse($realm->getRegistrationAllowed());
 
         $realm = $realm->withRegistrationAllowed(true);
-        $realm = $this->keycloak->realms()->update($realm->getRealm(), $realm);
+        $realm = $this->getKeycloak()->realms()->update($realm->getRealm(), $realm);
 
         static::assertTrue($realm->getRegistrationAllowed());
     }
@@ -56,7 +56,7 @@ public function testCanImportRealm(): void
         static::assertEquals('testing-id', $realm->getId());
         static::assertEquals('testing-realm', $realm->getRealm());
 
-        static::assertCount(2, $this->keycloak->realms()->all());
+        static::assertCount(2, $this->getKeycloak()->realms()->all());
     }
 
     public function testCanClearCaches(): void