diff --git a/plugins/module_utils/vendor/hcloud/_version.py b/plugins/module_utils/vendor/hcloud/_version.py
index 3f2e8eb..a077b8e 100644
--- a/plugins/module_utils/vendor/hcloud/_version.py
+++ b/plugins/module_utils/vendor/hcloud/_version.py
@@ -1,3 +1,3 @@
 from __future__ import annotations
 
-__version__ = "2.5.0"  # x-releaser-pleaser-version
+__version__ = "2.5.1"  # x-releaser-pleaser-version
diff --git a/plugins/module_utils/vendor/hcloud/firewalls/domain.py b/plugins/module_utils/vendor/hcloud/firewalls/domain.py
index 231dbf4..ed24d88 100644
--- a/plugins/module_utils/vendor/hcloud/firewalls/domain.py
+++ b/plugins/module_utils/vendor/hcloud/firewalls/domain.py
@@ -201,6 +201,9 @@ class FirewallResourceLabelSelector(BaseDomain):
     :param selector: str Target label selector
     """
 
+    __api_properties__ = ("selector",)
+    __slots__ = __api_properties__
+
     def __init__(self, selector: str | None = None):
         self.selector = selector
 
diff --git a/scripts/vendor.py b/scripts/vendor.py
index f8c5bc6..2da884a 100755
--- a/scripts/vendor.py
+++ b/scripts/vendor.py
@@ -22,7 +22,7 @@ from textwrap import dedent
 logger = logging.getLogger("vendor")
 
 HCLOUD_SOURCE_URL = "https://github.com/hetznercloud/hcloud-python"
-HCLOUD_VERSION = "v2.5.0"
+HCLOUD_VERSION = "v2.5.1"
 HCLOUD_VENDOR_PATH = "plugins/module_utils/vendor/hcloud"