diff --git a/a2a/reservation_service/pyproject.toml b/a2a/reservation_service/pyproject.toml
index 3247eec5..94117c4d 100644
--- a/a2a/reservation_service/pyproject.toml
+++ b/a2a/reservation_service/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
     "langchain-core>=1.3.3",
     "langchain-community>=0.3.27",
     "langchain-ollama>=0.2.1",
-    "langchain-openai>=0.3.7",
+    "langchain-openai>=1.2.2",
     "openinference-instrumentation-langchain>=0.1.65",
     "pydantic-settings>=2.14.1",
     "langchain-mcp-adapters>=0.1.0",
diff --git a/a2a/reservation_service/uv.lock b/a2a/reservation_service/uv.lock
index e80c7e87..0eee5bc8 100644
--- a/a2a/reservation_service/uv.lock
+++ b/a2a/reservation_service/uv.lock
@@ -1021,16 +1021,16 @@ wheels = [
 
 [[package]]
 name = "langchain-openai"
-version = "1.0.3"
+version = "1.2.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "openai" },
     { name = "tiktoken" },
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+sdist = { url = "https://files.pythonhosted.org/packages/f7/1b/c506c7f41156d3a6b4582b4c487f480001b8741deecc6e2d4931fdf4cf2c/langchain_openai-1.2.2.tar.gz", hash = "sha256:8698ffcee9a086e91ab6d207f0026181a03effcbf86bf9aee1808ee35af69dcc", size = 1147539, upload-time = "2026-05-21T22:08:31.123Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/a6/8e/7406c99afacafc8c2ce0fa4152f9f8b9598c93ceb291959821abd053b982/langchain_openai-1.2.2-py3-none-any.whl", hash = "sha256:7da39a3c70cbafa93853456199e39a264dc70651be79b12ac49b4f6a448bce2d", size = 99631, upload-time = "2026-05-21T22:08:29.527Z" },
 ]
 
 [[package]]
@@ -1390,7 +1390,7 @@ wheels = [
 
 [[package]]
 name = "openai"
-version = "2.8.1"
+version = "2.38.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
@@ -1402,9 +1402,9 @@ dependencies = [
     { name = "tqdm" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d5/e4/42591e356f1d53c568418dc7e30dcda7be31dd5a4d570bca22acb0525862/openai-2.8.1.tar.gz", hash = "sha256:cb1b79eef6e809f6da326a7ef6038719e35aa944c42d081807bfa1be8060f15f", size = 602490, upload-time = "2025-11-17T22:39:59.549Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/8f/12/cfa322c5f5dd8fa21aab9a7a8e979e7a11123800f86ca8d82eb68a83d213/openai-2.38.0.tar.gz", hash = "sha256:798694c6cf74145541fda94325b6f8f72d8e1fd0262cc137c8d728177a6a4ce3", size = 772764, upload-time = "2026-05-21T21:23:42.105Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/0a/bf/ccff9be562e24207716d04ef9dc931c76aff0c89a7265da43e2104d7fe06/openai-2.38.0-py3-none-any.whl", hash = "sha256:ec6661c57b2dcc47414a767e6e3335c7ed3d19c9696999283a3c82e95c756a3c", size = 1344910, upload-time = "2026-05-21T21:23:39.636Z" },
 ]
 
 [[package]]
@@ -2265,7 +2265,7 @@ requires-dist = [
     { name = "langchain-core", specifier = ">=1.3.3" },
     { name = "langchain-mcp-adapters", specifier = ">=0.1.0" },
     { name = "langchain-ollama", specifier = ">=0.2.1" },
-    { name = "langchain-openai", specifier = ">=0.3.7" },
+    { name = "langchain-openai", specifier = ">=1.2.2" },
     { name = "langgraph", specifier = ">=0.2.55" },
     { name = "openinference-instrumentation-langchain", specifier = ">=0.1.65" },
     { name = "opentelemetry-exporter-otlp" },