diff --git a/services/certificates/src/stackit/certificates/__init__.py b/services/certificates/src/stackit/certificates/__init__.py
index 43feed9a..87a8f418 100644
--- a/services/certificates/src/stackit/certificates/__init__.py
+++ b/services/certificates/src/stackit/certificates/__init__.py
@@ -13,7 +13,6 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
 __version__ = "1.0.0"
 
 # Define package exports
diff --git a/services/certificates/src/stackit/certificates/models/__init__.py b/services/certificates/src/stackit/certificates/models/__init__.py
index 7ee18028..803243b8 100644
--- a/services/certificates/src/stackit/certificates/models/__init__.py
+++ b/services/certificates/src/stackit/certificates/models/__init__.py
@@ -12,7 +12,6 @@
     Do not edit the class manually.
 """  # noqa: E501
 
-
 # import models into model package
 from stackit.certificates.models.create_certificate_payload import (
     CreateCertificatePayload,
diff --git a/services/certificates/src/stackit/certificates/models/create_certificate_payload.py b/services/certificates/src/stackit/certificates/models/create_certificate_payload.py
index 7d78c585..79097b00 100644
--- a/services/certificates/src/stackit/certificates/models/create_certificate_payload.py
+++ b/services/certificates/src/stackit/certificates/models/create_certificate_payload.py
@@ -17,6 +17,7 @@
 import pprint
 import re  # noqa: F401
 from typing import Any, ClassVar, Dict, List, Optional, Set
+from uuid import UUID
 
 from pydantic import BaseModel, ConfigDict, Field, StrictStr, field_validator
 from typing_extensions import Annotated, Self
@@ -31,9 +32,7 @@ class CreateCertificatePayload(BaseModel):
     private_key: Optional[StrictStr] = Field(
         default=None, description="The PEM encoded private key part", alias="privateKey"
     )
-    project_id: Optional[Annotated[str, Field(strict=True)]] = Field(
-        default=None, description="Project identifier", alias="projectId"
-    )
+    project_id: Optional[UUID] = Field(default=None, description="Project identifier", alias="projectId")
     public_key: Optional[StrictStr] = Field(
         default=None, description="The PEM encoded public key part", alias="publicKey"
     )