diff --git a/libs/langchain_v1/tests/unit_tests/agents/test_response_format.py b/libs/langchain_v1/tests/unit_tests/agents/test_response_format.py
index ad793ae8942..143b97e2636 100644
--- a/libs/langchain_v1/tests/unit_tests/agents/test_response_format.py
+++ b/libs/langchain_v1/tests/unit_tests/agents/test_response_format.py
@@ -925,7 +925,7 @@ class TestSupportsProviderStrategy:
 
     def test_allows_gemini_v3_with_tools(self) -> None:
         """Gemini 3 series models support structured output alongside tools."""
-        model = self._make_structured_model("gemini-3-pro-preview")
+        model = self._make_structured_model("gemini-3.1-pro-preview")
         assert _supports_provider_strategy(model, tools=[get_weather])
 
     @pytest.mark.parametrize(
diff --git a/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py b/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py
index 513da0edb59..e51f8d3d5d8 100644
--- a/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py
+++ b/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py
@@ -88,7 +88,7 @@ def test_supported_providers_is_sorted() -> None:
         ("Accounts/Fireworks/models/mixtral-8x7b-instruct", "fireworks"),
         ("gemini-1.5-pro", "google_vertexai"),
         ("gemini-2.5-pro", "google_vertexai"),
-        ("gemini-3-pro-preview", "google_vertexai"),
+        ("gemini-3.1-pro-preview", "google_vertexai"),
         ("amazon.titan-text-express-v1", "bedrock"),
         ("Amazon.Titan-Text-Express-v1", "bedrock"),
         ("anthropic.claude-v2", "bedrock"),