diff --git a/tests/unit/vertex_rag/conftest.py b/tests/unit/vertex_rag/conftest.py
index 46846be388..18d325cb53 100644
--- a/tests/unit/vertex_rag/conftest.py
+++ b/tests/unit/vertex_rag/conftest.py
@@ -162,6 +162,8 @@ def rag_data_client_preview_mock_exception():
         api_client_mock.list_rag_files.side_effect = Exception
         # delete_rag_file
         api_client_mock.delete_rag_file.side_effect = Exception
+        # update_rag_engine_config
+        api_client_mock.update_rag_engine_config.side_effect = Exception
         rag_data_client_mock_exception.return_value = api_client_mock
         yield rag_data_client_mock_exception
 
diff --git a/tests/unit/vertex_rag/test_rag_constants_preview.py b/tests/unit/vertex_rag/test_rag_constants_preview.py
index ee52bce881..e25d0108e8 100644
--- a/tests/unit/vertex_rag/test_rag_constants_preview.py
+++ b/tests/unit/vertex_rag/test_rag_constants_preview.py
@@ -60,6 +60,8 @@
     SharePointSources as GapicSharePointSources,
     SlackSource as GapicSlackSource,
     RagContexts,
+    RagManagedDbConfig,
+    RagEngineConfig,
     RetrieveContextsResponse,
     RagVectorDbConfig as GapicRagVectorDbConfig,
     VertexAiSearchConfig as GapicVertexAiSearchConfig,
@@ -75,7 +77,10 @@
 TEST_CORPUS_DISCRIPTION = "My first corpus."
 TEST_RAG_CORPUS_ID = "generate-123"
 TEST_API_ENDPOINT = "us-central1-" + aiplatform.constants.base.API_BASE_PATH
+TEST_RAG_ENGINE_CONFIG_DISPLAY_NAME = "my-rag-engine-config-1"
+TEST_RAG_ENGINE_CONFIG_DESCRIPTION = "My first rag engine config."
 TEST_RAG_CORPUS_RESOURCE_NAME = f"projects/{TEST_PROJECT_NUMBER}/locations/{TEST_REGION}/ragCorpora/{TEST_RAG_CORPUS_ID}"
+TEST_RAG_ENGINE_CONFIG_RESOURCE_NAME = f"projects/{TEST_PROJECT_NUMBER}/locations/{TEST_REGION}/ragEngineConfigs/test-rag-engine-config"
 
 # RagCorpus
 TEST_WEAVIATE_HTTP_ENDPOINT = "test.weaviate.com"
@@ -386,6 +391,18 @@
     parent=TEST_RAG_CORPUS_RESOURCE_NAME,
     import_rag_files_config=TEST_IMPORT_FILES_CONFIG_DRIVE_FOLDER_PARSING,
 )
+
+# Config Resource
+TEST_RAG_ENGINE_CONFIG_RESOURCE_NAME = (
+    TEST_RAG_CORPUS_RESOURCE_NAME + "/ragEngineConfigs/test-rag-engine-config"
+)
+TEST_RAG_ENGINE_CONFIG_DISPLAY_NAME = "test-rag-engine-config"
+TEST_RAG_ENGINE_CONFIG_DESCRIPTION = "test-rag-engine-config-description"
+TEST_RAG_ENGINE_CONFIG = RagEngineConfig(
+    name=TEST_RAG_ENGINE_CONFIG_RESOURCE_NAME,
+    rag_managed_db_config=RagManagedDbConfig(),
+)
+
 # Google Drive files
 TEST_DRIVE_FILE_ID = "456"
 TEST_DRIVE_FILE = f"https://drive.google.com/file/d/{TEST_DRIVE_FILE_ID}"
diff --git a/tests/unit/vertex_rag/test_rag_data_preview.py b/tests/unit/vertex_rag/test_rag_data_preview.py
index d23f718560..98e7d27501 100644
--- a/tests/unit/vertex_rag/test_rag_data_preview.py
+++ b/tests/unit/vertex_rag/test_rag_data_preview.py
@@ -296,6 +296,40 @@ def list_rag_corpora_pager_mock():
         yield list_rag_corpora_pager_mock
 
 
+@pytest.fixture()
+def update_config_mock():
+    with mock.patch.object(
+        VertexRagDataServiceClient,
+        "update_rag_engine_config",
+    ) as update_rag_engine_config_mock:
+        update_rag_engine_config_mock.return_value = (
+            test_rag_constants_preview.TEST_GAPIC_RAG_ENGINE_CONFIG
+        )
+        yield update_rag_engine_config_mock
+
+
+@pytest.fixture()
+def update_config_mock_exception():
+    with mock.patch.object(
+        VertexRagDataServiceClient,
+        "update_rag_engine_config",
+    ) as update_rag_engine_config_mock_exception:
+        update_rag_engine_config_mock_exception.side_effect = Exception
+        yield update_rag_engine_config_mock_exception
+
+
+@pytest.fixture()
+def update_config_mock_vertex_ai_engine_search_config():
+    with mock.patch.object(
+        VertexRagDataServiceClient,
+        "update_rag_engine_config",
+    ) as update_rag_engine_config_mock_vertex_ai_engine_search_config:
+        update_rag_engine_config_mock_vertex_ai_engine_search_config.return_value = (
+            test_rag_constants_preview.TEST_GAPIC_RAG_ENGINE_CONFIG_VERTEX_AI_ENGINE_SEARCH_CONFIG
+        )
+        yield update_rag_engine_config_mock_vertex_ai_engine_search_config
+
+
 class MockResponse:
     def __init__(self, json_data, status_code):
         self.json_data = json_data
@@ -1258,3 +1292,16 @@ def test_set_embedding_model_config_wrong_endpoint_format_error(self):
                 test_rag_constants_preview.TEST_GAPIC_RAG_CORPUS,
             )
         e.match("endpoint must be of the format ")
+
+    def test_update_rag_engine_config_success(self, rag_data_client_preview_mock):
+        rag.update_rag_engine_config(
+            rag_engine_config=test_rag_constants_preview.TEST_RAG_ENGINE_CONFIG,
+        )
+        assert rag_data_client_preview_mock.call_count == 1
+
+    def test_update_rag_engine_config_failure(self):
+        with pytest.raises(RuntimeError) as e:
+            rag.update_rag_engine_config(
+                rag_engine_config=test_rag_constants_preview.TEST_RAG_ENGINE_CONFIG,
+            )
+        e.match("Failed in RagEngineConfig update due to")
diff --git a/vertexai/preview/rag/__init__.py b/vertexai/preview/rag/__init__.py
index 5841fd5aa6..1245a07e02 100644
--- a/vertexai/preview/rag/__init__.py
+++ b/vertexai/preview/rag/__init__.py
@@ -25,6 +25,7 @@
     get_file,
     list_files,
     delete_file,
+    update_rag_engine_config,
 )
 from vertexai.preview.rag.rag_retrieval import (
     retrieval_query,
diff --git a/vertexai/preview/rag/rag_data.py b/vertexai/preview/rag/rag_data.py
index d0fffa219d..2036e445a5 100644
--- a/vertexai/preview/rag/rag_data.py
+++ b/vertexai/preview/rag/rag_data.py
@@ -34,6 +34,7 @@
     ListRagFilesRequest,
     RagCorpus as GapicRagCorpus,
     UpdateRagCorpusRequest,
+    UpdateRagEngineConfigRequest,
 )
 from google.cloud.aiplatform_v1beta1.services.vertex_rag_data_service.pagers import (
     ListRagCorporaPager,
@@ -51,6 +52,7 @@
     RagCorpus,
     RagFile,
     RagManagedDb,
+    RagEngineConfig,
     RagVectorDbConfig,
     SharePointSources,
     SlackChannelsSource,
@@ -926,3 +928,37 @@ def delete_file(name: str, corpus_name: Optional[str] = None) -> None:
     except Exception as e:
         raise RuntimeError("Failed in RagFile deletion due to: ", e) from e
     return None
+
+
+def update_rag_engine_config(
+    rag_engine_config: RagEngineConfig,
+) -> None:
+    """Update RagEngineConfig.
+
+    Example usage:
+    ```
+    import vertexai
+    from vertexai.preview import rag
+    vertexai.init(project="my-project")
+    rag_engine_config = rag.RagEngineConfig(
+        name="projects/my-project/locations/us-central1/ragEngineConfigs/my-rag-engine-config"
+        ),
+    )
+    rag.update_rag_engine_config(rag_engine_config=rag_engine_config)
+    ```
+
+    Args:
+        rag_engine_config: The RagEngineConfig to update.
+
+    Raises:
+        RuntimeError: Failed in RagEngineConfig update due to exception.
+    """
+    request = UpdateRagEngineConfigRequest(
+        rag_engine_config=rag_engine_config,
+    )
+    client = _gapic_utils.create_rag_data_service_client()
+    try:
+        client.update_rag_engine_config(request=request)
+    except Exception as e:
+        raise RuntimeError("Failed in RagEngineConfig update due to: ", e) from e
+    return None
diff --git a/vertexai/preview/rag/utils/resources.py b/vertexai/preview/rag/utils/resources.py
index 27e2e7f208..28819ab9ac 100644
--- a/vertexai/preview/rag/utils/resources.py
+++ b/vertexai/preview/rag/utils/resources.py
@@ -524,3 +524,16 @@ class LlmParserConfig:
     model_name: str
     max_parsing_requests_per_min: Optional[int] = None
     custom_parsing_prompt: Optional[str] = None
+
+
+@dataclasses.dataclass
+class RagEngineConfig:
+    """RagEngineConfig.
+
+    Attributes:
+        name: Generated resource name. Format:
+            ``projects/{project}/locations/{location}/ragEngineConfig/
+            {rag_engine_config}``
+    """
+
+    name: str