diff --git a/pyproject.toml b/pyproject.toml
index 3240a1764..8688b5ff1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dev = [
     "ruff>=0.15.2,<0.16",
     "mypy>=1.0.0,<2",
     "openai>=0.27.8",
-    "langchain-openai>=0.0.5,<0.4",
+    "langchain-openai>=0.0.5,<1.2",
     "langchain>=1,<2",
     "langgraph>=1,<2",
     "autoevals>=0.0.130,<0.1",
diff --git a/uv.lock b/uv.lock
index 938561497..c490b9bb4 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3,7 +3,7 @@ revision = 3
 requires-python = ">=3.10, <4.0"
 
 [options]
-exclude-newer = "2026-03-23T20:02:18.050568Z"
+exclude-newer = "2026-03-25T06:10:47.370621815Z"
 exclude-newer-span = "P7D"
 
 [[package]]
@@ -540,16 +540,16 @@ wheels = [
 
 [[package]]
 name = "langchain-openai"
-version = "0.3.34"
+version = "1.1.12"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "openai" },
     { name = "tiktoken" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/75/23/91461c6c2b1c8ceeadd6fefe453a03b1537afeff4ace3c118d7e7659f5a7/langchain_openai-0.3.34.tar.gz", hash = "sha256:57916d462be5b8fd19e5cb2f00d4e5cf0465266a292d583de2fc693a55ba190e", size = 785924, upload-time = "2025-10-01T15:18:40.635Z" }
+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" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/66/94/132aff5a1ed4ebfe7b4d3e4dbf30b9f70ce2bd2ac3470d0c0e742845afb1/langchain_openai-0.3.34-py3-none-any.whl", hash = "sha256:08d61d68a6d869c70d542171e149b9065668dedfc4fafcd4de8aeb5b933030a9", size = 75605, upload-time = "2025-10-01T15:18:39.415Z" },
+    { 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" },
 ]
 
 [[package]]
@@ -604,7 +604,7 @@ requires-dist = [
 dev = [
     { name = "autoevals", specifier = ">=0.0.130,<0.1" },
     { name = "langchain", specifier = ">=1,<2" },
-    { name = "langchain-openai", specifier = ">=0.0.5,<0.4" },
+    { name = "langchain-openai", specifier = ">=0.0.5,<1.2" },
     { name = "langgraph", specifier = ">=1,<2" },
     { name = "mypy", specifier = ">=1.0.0,<2" },
     { name = "openai", specifier = ">=0.27.8" },