diff --git a/requirements.txt b/requirements.txt
index 28d61715..14dc5d0e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -111,8 +111,8 @@ geopandas>=0.14.0  # For reading and querying GeoPackage files
 fiona>=1.9.0  # Required by geopandas for reading GeoPackage files
 
 ## LangChain & LangGraph for chatbot workflow
-langchain>=0.1.0
-langchain-core>=0.1.0
-langgraph>=0.0.20
-langchain-tavily>=0.0.1
+langchain==1.2.8
+langchain-core==1.2.8
+langgraph==1.0.7
+langchain-tavily==0.2.17
 nest-asyncio>=1.6.0  # For running async code in sync context (LangGraph compatibility)
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