diff --git a/pyproject.toml b/pyproject.toml
index 9ca19fc..144a53d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dev = [
     "mypy==1.16.1",
     "pre-commit==4.2.0",
     "httpx==0.28.1",
-    "langchain-google-genai==2.1.8",
+    "langchain-google-genai==4.2.1",
     "langchain_mcp_adapters==0.1.8",
     "langgraph==0.5.4",
     "bandit==1.9.3",