diff --git a/src/Socialbox/Classes/StandardMethods/AddressBookUpdateRelationship.php b/src/Socialbox/Classes/StandardMethods/AddressBookUpdateRelationship.php
new file mode 100644
index 0000000..cd913ec
--- /dev/null
+++ b/src/Socialbox/Classes/StandardMethods/AddressBookUpdateRelationship.php
@@ -0,0 +1,68 @@
+<?php
+
+    namespace Socialbox\Classes\StandardMethods;
+
+    use InvalidArgumentException;
+    use Socialbox\Abstracts\Method;
+    use Socialbox\Enums\StandardError;
+    use Socialbox\Enums\Types\ContactRelationshipType;
+    use Socialbox\Exceptions\DatabaseOperationException;
+    use Socialbox\Exceptions\StandardException;
+    use Socialbox\Interfaces\SerializableInterface;
+    use Socialbox\Managers\ContactManager;
+    use Socialbox\Objects\ClientRequest;
+    use Socialbox\Objects\PeerAddress;
+    use Socialbox\Objects\RpcRequest;
+
+    class AddressBookUpdateRelationship extends Method
+    {
+        /**
+         * @inheritDoc
+         */
+        public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+        {
+            if(!$rpcRequest->containsParameter('peer'))
+            {
+                return $rpcRequest->produceError(StandardError::RPC_INVALID_ARGUMENTS, 'Missing required peer parameter');
+            }
+
+            try
+            {
+                $address = PeerAddress::fromAddress($rpcRequest->getParameter('peer'));
+            }
+            catch(InvalidArgumentException $e)
+            {
+                throw new StandardException('Invalid peer address', StandardError::RPC_INVALID_ARGUMENTS, $e);
+            }
+
+            if(!$rpcRequest->containsParameter('relationship'))
+            {
+                return $rpcRequest->produceError(StandardError::RPC_INVALID_ARGUMENTS, 'Missing required relationship parameter');
+            }
+            $relationship = ContactRelationshipType::tryFrom(strtoupper($rpcRequest->getParameter('relationship')));
+            if($relationship === null)
+            {
+                throw new StandardException('Invalid relationship type', StandardError::RPC_INVALID_ARGUMENTS);
+            }
+
+            try
+            {
+                // Check if the contact already exists
+                $peer = $request->getPeer();
+                if(!ContactManager::isContact($peer, $address))
+                {
+                    return $rpcRequest->produceError(StandardError::FORBIDDEN, 'Contact does not exist');
+                }
+
+                // Create the contact
+                ContactManager::updateContactRelationship($peer, $address, $relationship);
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardException('Failed to update contact relationship', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            // Return success
+            return $rpcRequest->produceResponse(true);
+        }
+    }
\ No newline at end of file