diff --git a/a2a/weather_service/pyproject.toml b/a2a/weather_service/pyproject.toml
index b6bd6e99..d0438770 100644
--- a/a2a/weather_service/pyproject.toml
+++ b/a2a/weather_service/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "langgraph>=1.1.3",
     "langchain-core>=1.2.11",
     "langchain-community>=0.3.27",
-    "langchain-ollama>=0.2.1",
+    "langchain-ollama>=1.1.0",
     "langchain-openai>=0.3.7",
     "mlflow[langchain,kubernetes]>=3.11.1,<4",
     "pydantic-settings>=2.8.1",