diff --git a/server/main.py b/server/main.py
index a11b9bd53..3be534dcd 100644
--- a/server/main.py
+++ b/server/main.py
@@ -124,6 +124,11 @@ class MemoryCreate(BaseModel):
     prompt: Optional[str] = Field(None, description="Custom prompt to use for fact extraction.")
 
 
+class MemoryUpdate(BaseModel):
+    text: str = Field(..., description="New content to update the memory with.")
+    metadata: Optional[Dict[str, Any]] = Field(None, description="Metadata to update.")
+
+
 class SearchRequest(BaseModel):
     query: str = Field(..., description="Search query.")
     user_id: Optional[str] = None
@@ -199,18 +204,18 @@ def search_memories(search_req: SearchRequest, _api_key: Optional[str] = Depends
 
 
 @app.put("/memories/{memory_id}", summary="Update a memory")
-def update_memory(memory_id: str, updated_memory: Dict[str, Any], _api_key: Optional[str] = Depends(verify_api_key)):
+def update_memory(memory_id: str, updated_memory: MemoryUpdate, _api_key: Optional[str] = Depends(verify_api_key)):
     """Update an existing memory with new content.
-    
+
     Args:
         memory_id (str): ID of the memory to update
-        updated_memory (str): New content to update the memory with
-        
+        updated_memory (MemoryUpdate): New content and optional metadata to update the memory with
+
     Returns:
         dict: Success message indicating the memory was updated
     """
     try:
-        return MEMORY_INSTANCE.update(memory_id=memory_id, data=updated_memory)
+        return MEMORY_INSTANCE.update(memory_id=memory_id, data=updated_memory.text, metadata=updated_memory.metadata)
     except Exception as e:
         logging.exception("Error in update_memory:")
         raise HTTPException(status_code=500, detail=str(e))
diff --git a/tests/test_server_auth.py b/tests/test_server_auth.py
index d72a6789a..4feb60d38 100644
--- a/tests/test_server_auth.py
+++ b/tests/test_server_auth.py
@@ -94,7 +94,7 @@ class TestAuthDisabled:
         assert resp.status_code == 200
 
     def test_update_memory_without_key(self):
-        resp = self.client.put("/memories/mem-1", json={"data": "updated"})
+        resp = self.client.put("/memories/mem-1", json={"text": "updated"})
         assert resp.status_code == 200
 
     def test_history_without_key(self):
@@ -276,7 +276,7 @@ class TestAuthEnabled:
         assert resp.status_code == 200
 
     def test_update_memory_with_key(self):
-        resp = self._authed("PUT", "/memories/mem-1", json={"data": "updated"})
+        resp = self._authed("PUT", "/memories/mem-1", json={"text": "updated"})
         assert resp.status_code == 200
 
     def test_history_with_key(self):
@@ -346,7 +346,7 @@ class TestAuthenticatedCRUDFlow:
         self.mock.search.assert_called_once()
 
         # 5. Update
-        resp = self._authed("PUT", "/memories/mem-1", json={"data": "updated content"})
+        resp = self._authed("PUT", "/memories/mem-1", json={"text": "updated content"})
         assert resp.status_code == 200
         self.mock.update.assert_called_once()
 
diff --git a/tests/test_server_params.py b/tests/test_server_params.py
index ae569fc00..b614e571e 100644
--- a/tests/test_server_params.py
+++ b/tests/test_server_params.py
@@ -505,3 +505,59 @@ class TestCallSignatureMatch:
         assert resp.status_code == 200
         _, kwargs = mock_memory.search.call_args
         assert kwargs["query"] == "food"
+
+
+# ===========================================================================
+# MemoryUpdate: text and metadata forwarding (fix for #3933)
+# ===========================================================================
+
+class TestUpdateMemory:
+    """Verify that PUT /memories/{id} extracts text and metadata from the
+    request body and forwards them correctly to Memory.update()."""
+
+    def test_text_forwarded_as_data(self, client, mock_memory):
+        resp = client.put("/memories/mem-1", json={"text": "Likes tennis"})
+        assert resp.status_code == 200
+        _, kwargs = mock_memory.update.call_args
+        assert kwargs["data"] == "Likes tennis"
+
+    def test_metadata_forwarded(self, client, mock_memory):
+        resp = client.put("/memories/mem-1", json={
+            "text": "Likes tennis",
+            "metadata": {"category": "sports"},
+        })
+        assert resp.status_code == 200
+        _, kwargs = mock_memory.update.call_args
+        assert kwargs["metadata"] == {"category": "sports"}
+
+    def test_metadata_omitted_passes_none(self, client, mock_memory):
+        resp = client.put("/memories/mem-1", json={"text": "Likes tennis"})
+        assert resp.status_code == 200
+        _, kwargs = mock_memory.update.call_args
+        assert kwargs["metadata"] is None
+
+    def test_missing_text_returns_422(self, client):
+        """text is required — omitting it should fail validation."""
+        resp = client.put("/memories/mem-1", json={"metadata": {"k": "v"}})
+        assert resp.status_code == 422
+
+    def test_dict_not_passed_as_data(self, client, mock_memory):
+        """Regression test for #3933: the entire dict must NOT be passed as data."""
+        resp = client.put("/memories/mem-1", json={"text": "updated content"})
+        assert resp.status_code == 200
+        _, kwargs = mock_memory.update.call_args
+        assert isinstance(kwargs["data"], str)
+
+
+class TestUpdateOpenAPISchema:
+    """Verify the MemoryUpdate schema appears in the OpenAPI docs."""
+
+    def test_update_schema_includes_text(self, client):
+        schema = client.get("/openapi.json").json()
+        update_props = schema["components"]["schemas"]["MemoryUpdate"]["properties"]
+        assert "text" in update_props
+
+    def test_update_schema_includes_metadata(self, client):
+        schema = client.get("/openapi.json").json()
+        update_props = schema["components"]["schemas"]["MemoryUpdate"]["properties"]
+        assert "metadata" in update_props