diff --git a/README.md b/README.md
index a24c0a7..58ac262 100644
--- a/README.md
+++ b/README.md
@@ -2547,6 +2547,32 @@ project_metadata_id = client.update_project_metadata(
 )
 ```
 
+### Update Project User Permission
+
+Update or assign user permissions for a project.
+
+```python
+# Add or update user permission
+result = client.update_project_user_permission(
+  project="YOUR_PROJECT_SLUG",
+  email="user@example.com",
+  role="annotator"
+)
+
+# Remove user from project
+result = client.update_project_user_permission(
+  project="YOUR_PROJECT_SLUG",
+  email="user@example.com",
+  role="none"
+)
+```
+
+Available roles:
+- `annotator`: Annotator
+- `reviewer`: Reviewer  
+- `owner`: Project owner
+- `none`: Remove user from project
+
 ## Tags
 
 ### Get Tags
diff --git a/fastlabel/__init__.py b/fastlabel/__init__.py
index 24b0348..5a79d51 100644
--- a/fastlabel/__init__.py
+++ b/fastlabel/__init__.py
@@ -4137,6 +4137,26 @@ def update_project_metadata(
         }
         return self.api.put_request(endpoint, payload=payload)
 
+    def update_project_user_permission(
+        self,
+        project: str,
+        email: str,
+        role: str,
+    ) -> bool:
+        """
+        Update project user permission.
+
+        project is the slug of the project (Required).
+        email is the email address of the user (Required).
+        role is the role of the user in the project (Required).
+        role can be 'annotator', 'reviewer', 'owner',
+        'external_annotator', 'external_reviewer', 'external_approver',
+        'external_sub_owner', 'external_owner', or 'none' to remove user from project.
+        """
+        endpoint = "projects-users"
+        payload = {"project": project, "email": email, "role": role}
+        return self.api.put_request(endpoint, payload=payload)
+
     # Tags
 
     def get_tags(
@@ -4680,9 +4700,11 @@ def execute_training_job(
             "learningRate": learning_rate,
             "resizeOption": resize_option,
             "resizeDimension": resize_dimension,
-            "configFile": utils.base64_encode(str(config_file_path))
-            if config_file_path is not None
-            else None,
+            "configFile": (
+                utils.base64_encode(str(config_file_path))
+                if config_file_path is not None
+                else None
+            ),
         }
         if annotation_value:
             payload["annotationValue"] = annotation_value
diff --git a/fastlabel/utils/mask_image_util.py b/fastlabel/utils/mask_image_util.py
index b862f06..b48f6e6 100644
--- a/fastlabel/utils/mask_image_util.py
+++ b/fastlabel/utils/mask_image_util.py
@@ -27,7 +27,7 @@ def mask_to_polygon(mask_image: Union[str, np.ndarray]) -> list[list[list[int]]]
 
 
 def mask_to_segmentation(
-    mask_image: Union[str, np.ndarray, Mat, UMat, Image]
+    mask_image: Union[str, np.ndarray, Mat, UMat, Image],
 ) -> list[list[list[int]]]:
     if isinstance(mask_image, str):
         mask_image_path = mask_image