diff --git a/libs/vertexai/poetry.lock b/libs/vertexai/poetry.lock
index 8b003cba..e6a840eb 100644
--- a/libs/vertexai/poetry.lock
+++ b/libs/vertexai/poetry.lock
@@ -2757,4 +2757,4 @@ mistral = ["langchain-mistralai"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.9,<4.0"
-content-hash = "f81f09ee71fcd48ec574381f15b0f6a11b76f8aa7e63e2946b25a69fc201f8a9"
+content-hash = "fd6089e49c9de43f254f7643f0a5e6bb631f21f2e1e8558d4d7e82dbdb2de2f9"
diff --git a/libs/vertexai/pyproject.toml b/libs/vertexai/pyproject.toml
index 3d0fecbf..d0dd0c2b 100644
--- a/libs/vertexai/pyproject.toml
+++ b/libs/vertexai/pyproject.toml
@@ -17,7 +17,7 @@ google-cloud-aiplatform = "^1.56.0"
 google-cloud-storage = "^2.17.0"
 # optional dependencies
 anthropic = { extras = ["vertexai"], version = ">=0.30.0,<1", optional = true }
-langchain-mistralai = { git = "https://github.com/langchain-ai/langchain.git", subdirectory = "libs/partners/mistralai", branch = "v0.3rc"}
+langchain-mistralai = { git = "https://github.com/langchain-ai/langchain.git", subdirectory = "libs/partners/mistralai", optional = true, branch = "v0.3rc"}
 httpx = "^0.27.0"
 httpx-sse = "^0.4.0"
 pydantic = ">=2,<3"