diff --git a/README.md b/README.md
index 2c87942..c03afea 100644
--- a/README.md
+++ b/README.md
@@ -2527,6 +2527,19 @@ Copy a project.
 project_id = client.copy_project(project_id="YOUR_PROJECT_ID")
 ```
 
+### Update Project Metadata
+
+Update a project metadata.
+
+```python
+project_metadata_id = client.update_project_metadata(
+  project_id="YOUR_PROJECT_ID",
+  external_code_1="ExternalCode1",
+  external_code_2="ExternalCode2",
+  external_code_3=None
+)
+```
+
 ## Tags
 
 ### Get Tags
diff --git a/fastlabel/__init__.py b/fastlabel/__init__.py
index f1b112a..91d5f32 100644
--- a/fastlabel/__init__.py
+++ b/fastlabel/__init__.py
@@ -4113,6 +4113,30 @@ def copy_project(self, project_id: str) -> None:
         endpoint = "projects/copy"
         return self.api.post_request(endpoint, payload=payload)
 
+    def update_project_metadata(
+        self,
+        project_id: str,
+        external_code_1: Optional[str],
+        external_code_2: Optional[str],
+        external_code_3: Optional[str],
+    ) -> str:
+        """
+        Update project metadata.
+
+        project_id is an id of the project (Required).
+        external_code_1 is a code for external identification.
+        external_code_2 is a code for external identification.
+        external_code_3 is a code for external identification.
+
+        """
+        endpoint = "projects/" + project_id + "/metadata"
+        payload = {
+            "externalCode1": external_code_1,
+            "externalCode2": external_code_2,
+            "externalCode3": external_code_3,
+        }
+        return self.api.put_request(endpoint, payload=payload)
+
     # Tags
 
     def get_tags(