diff --git a/pyproject.toml b/pyproject.toml
index 6cf78ab406..a93443d459 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -95,7 +95,8 @@ test = [
   # go/keep-sorted start
   "anthropic>=0.43.0",               # For anthropic model tests
   "langchain-community>=0.3.17",
-  "langgraph>=0.2.60",               # For LangGraphAgent
+  # langgraph 0.5 removed langgraph.graph.graph which we depend on
+  "langgraph>=0.2.60, <= 0.4.10",    # For LangGraphAgent
   "litellm>=1.71.2",                 # For LiteLLM tests
   "llama-index-readers-file>=0.4.0", # For retrieval tests
   "pytest-asyncio>=0.25.0",