diff --git a/requirements.txt b/requirements.txt
index 2ef6fc7..55c113c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ coverage==7.16.1
 httpx==0.28.1
 
 # --- Agent orchestration ---
-langgraph==1.2.12
+langgraph==1.2.15
 jpype1==1.7.1
 
 # --- Cloud / data-source tools ---
diff --git a/streamlit_demo/requirements.txt b/streamlit_demo/requirements.txt
index 97b5bb3..d940a1d 100644
--- a/streamlit_demo/requirements.txt
+++ b/streamlit_demo/requirements.txt
@@ -1,3 +1,3 @@
 streamlit==1.65.0
-langgraph==1.2.12
+langgraph==1.2.15
 ddgs==9.16.0