diff --git a/letta/server/rest_api/routers/v1/identities.py b/letta/server/rest_api/routers/v1/identities.py
index 04d38c63..d3d7bfd9 100644
--- a/letta/server/rest_api/routers/v1/identities.py
+++ b/letta/server/rest_api/routers/v1/identities.py
@@ -3,7 +3,7 @@ from typing import TYPE_CHECKING, List, Optional
 from fastapi import APIRouter, Body, Depends, Header, HTTPException, Query
 
 from letta.orm.errors import NoResultFound, UniqueConstraintViolationError
-from letta.schemas.identity import Identity, IdentityCreate, IdentityType, IdentityUpdate
+from letta.schemas.identity import Identity, IdentityCreate, IdentityProperty, IdentityType, IdentityUpdate
 from letta.server.rest_api.utils import get_letta_server
 
 if TYPE_CHECKING:
@@ -125,6 +125,24 @@ def modify_identity(
         raise HTTPException(status_code=500, detail=f"{e}")
 
 
+@router.put("/{identity_id}/properties", tags=["identities"], operation_id="upsert_identity_properties")
+def upsert_identity_properties(
+    identity_id: str,
+    properties: List[IdentityProperty] = Body(...),
+    server: "SyncServer" = Depends(get_letta_server),
+    actor_id: Optional[str] = Header(None, alias="user_id"),  # Extract user_id from header, default to None if not present
+):
+    try:
+        actor = server.user_manager.get_user_or_default(user_id=actor_id)
+        return server.identity_manager.upsert_identity_properties(identity_id=identity_id, properties=properties, actor=actor)
+    except HTTPException:
+        raise
+    except NoResultFound as e:
+        raise HTTPException(status_code=404, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"{e}")
+
+
 @router.delete("/{identity_id}", tags=["identities"], operation_id="delete_identity")
 def delete_identity(
     identity_id: str,
diff --git a/letta/services/identity_manager.py b/letta/services/identity_manager.py
index c1e19b41..9bb629e8 100644
--- a/letta/services/identity_manager.py
+++ b/letta/services/identity_manager.py
@@ -8,7 +8,7 @@ from letta.orm.agent import Agent as AgentModel
 from letta.orm.block import Block as BlockModel
 from letta.orm.identity import Identity as IdentityModel
 from letta.schemas.identity import Identity as PydanticIdentity
-from letta.schemas.identity import IdentityCreate, IdentityType, IdentityUpdate
+from letta.schemas.identity import IdentityCreate, IdentityProperty, IdentityType, IdentityUpdate
 from letta.schemas.user import User as PydanticUser
 from letta.utils import enforce_types
 
@@ -165,6 +165,20 @@ class IdentityManager:
         existing_identity.update(session, actor=actor)
         return existing_identity.to_pydantic()
 
+    @enforce_types
+    def upsert_identity_properties(self, identity_id: str, properties: List[IdentityProperty], actor: PydanticUser) -> PydanticIdentity:
+        with self.session_maker() as session:
+            existing_identity = IdentityModel.read(db_session=session, identifier=identity_id, actor=actor)
+            if existing_identity is None:
+                raise HTTPException(status_code=404, detail="Identity not found")
+            return self._update_identity(
+                session=session,
+                existing_identity=existing_identity,
+                identity=IdentityUpdate(properties=properties),
+                actor=actor,
+                replace=True,
+            )
+
     @enforce_types
     def delete_identity(self, identity_id: str, actor: PydanticUser) -> None:
         with self.session_maker() as session:
diff --git a/tests/test_managers.py b/tests/test_managers.py
index ab797b04..c939f31f 100644
--- a/tests/test_managers.py
+++ b/tests/test_managers.py
@@ -3488,6 +3488,34 @@ def test_get_set_blocks_for_identities(server: SyncServer, default_block, defaul
     server.identity_manager.delete_identity(identity.id, actor=default_user)
 
 
+def test_upsert_properties(server: SyncServer, default_user):
+    identity_create = IdentityCreate(
+        identifier_key="1234",
+        name="caren",
+        identity_type=IdentityType.user,
+        properties=[
+            IdentityProperty(key="email", value="caren@letta.com", type=IdentityPropertyType.string),
+            IdentityProperty(key="age", value=28, type=IdentityPropertyType.number),
+        ],
+    )
+
+    identity = server.identity_manager.create_identity(identity_create, actor=default_user)
+    properties = [
+        IdentityProperty(key="email", value="caren@gmail.com", type=IdentityPropertyType.string),
+        IdentityProperty(key="age", value="28", type=IdentityPropertyType.string),
+        IdentityProperty(key="test", value=123, type=IdentityPropertyType.number),
+    ]
+
+    updated_identity = server.identity_manager.upsert_identity_properties(
+        identity_id=identity.id,
+        properties=properties,
+        actor=default_user,
+    )
+    assert updated_identity.properties == properties
+
+    server.identity_manager.delete_identity(identity.id, actor=default_user)
+
+
 # ======================================================================================================================
 # SourceManager Tests - Sources
 # ======================================================================================================================