diff --git a/a2a/weather_service/pyproject.toml b/a2a/weather_service/pyproject.toml
index a97fb076..a096de6d 100644
--- a/a2a/weather_service/pyproject.toml
+++ b/a2a/weather_service/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
     "langchain-core>=1.3.3",
     "langchain-community>=0.4.1",
     "langchain-ollama>=1.1.0",
-    "langchain-openai>=0.3.7",
+    "langchain-openai>=1.2.1",
     "mlflow[langchain,kubernetes]>=3.11.1,<4",
     "pydantic-settings>=2.14.1",
     "langchain-mcp-adapters>=0.1.0",
diff --git a/a2a/weather_service/uv.lock b/a2a/weather_service/uv.lock
index a4d3eff7..9369f0fe 100644
--- a/a2a/weather_service/uv.lock
+++ b/a2a/weather_service/uv.lock
@@ -1516,16 +1516,16 @@ wheels = [
 
 [[package]]
 name = "langchain-openai"
-version = "1.1.12"
+version = "1.2.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "openai" },
     { name = "tiktoken" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/cc/fd/7dee16e882c4c1577d48db174d85aa3a0ee09ba61eb6a5d41650285ca80c/langchain_openai-1.1.12.tar.gz", hash = "sha256:ccf5ef02c896f6807b4d0e51aaf678a72ce81ae41201cae8d65e11eeff9ecb79", size = 1114119, upload-time = "2026-03-23T18:59:19.211Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/9a/0e/d8e16c28aa67106d285e63b8ffc04c5af68341e345ce24a0751dbf2e167e/langchain_openai-1.2.1.tar.gz", hash = "sha256:ee4480b787706361b7125fad46930589a624df87aa158c6986ef1fad10d10675", size = 1146092, upload-time = "2026-04-24T19:46:43.328Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/6e/a6/68fb22e3604015e6f546fa1d3677d24378b482855ae74710cbf4aec44132/langchain_openai-1.1.12-py3-none-any.whl", hash = "sha256:da71ca3f2d18c16f7a2443cc306aa195ad2a07054335ac9b0626dcae02b6a0c5", size = 88487, upload-time = "2026-03-23T18:59:17.978Z" },
+    { url = "https://files.pythonhosted.org/packages/dc/55/2865b18ee3a3dd11160b8c4b2cf37e75bf2a4a8d1d38868ffffc7b7cc180/langchain_openai-1.2.1-py3-none-any.whl", hash = "sha256:a80732185030d4f453dda6c25feef46f645f665423fdffe38ae3edf1ac3c6c4d", size = 98626, upload-time = "2026-04-24T19:46:41.971Z" },
 ]
 
 [[package]]
@@ -3664,7 +3664,7 @@ requires-dist = [
     { name = "langchain-core", specifier = ">=1.3.3" },
     { name = "langchain-mcp-adapters", specifier = ">=0.1.0" },
     { name = "langchain-ollama", specifier = ">=1.1.0" },
-    { name = "langchain-openai", specifier = ">=0.3.7" },
+    { name = "langchain-openai", specifier = ">=1.2.1" },
     { name = "langchain-text-splitters", specifier = ">=1.1.2" },
     { name = "langgraph", specifier = ">=1.1.3" },
     { name = "langgraph-checkpoint", specifier = ">=3.0.0" },