diff --git a/backend/requirements.txt b/backend/requirements.txt
index b824c06..f0c7ac0 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -8,7 +8,7 @@ sse-starlette==1.8.2
 langchain==0.3.0
 langchain-community==0.3.0
 langchain-ollama==0.2.0
-langchain-core==0.3.0
+langchain-core==0.3.81
 langgraph==0.2.28
 langsmith==0.1.140