diff --git a/uv.lock b/uv.lock
index 31b40da..7d65f22 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1191,16 +1191,16 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.3.17"
+version = "1.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "langgraph" },
     { name = "pydantic" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f6/35/0ecf83081916c309fb7d59dfc7e03af5c4b223a1ecac0802aba48563f8c2/langchain-1.3.17.tar.gz", hash = "sha256:d377a0f910058aa3d64eced134013b377409d52f7f27907f8e8b0817af4b3de5", size = 636412, upload-time = "2026-08-25T02:40:41.89Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/c4/5d/0ef368fdcf5df08a394787196fb7a80f473a9c7b3fc4cd2e3b53a7a5853d/langchain-1.4.0.tar.gz", hash = "sha256:08da122a439f738f4c09a5158cfa3d2c1d8bea2d0bde7fbbf4aeb4d7f7fd9d80", size = 729354, upload-time = "2026-09-03T16:59:32.442Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/cf/a0/7ac6a56ae7b1d9e04b935023b46700dd2cf093f291636d0e7e9074f8f02f/langchain-1.3.17-py3-none-any.whl", hash = "sha256:1ba25d0228ebe6daa102008562dff52c4c88d9683f7f3c2d19c4adc6415b61b2", size = 147872, upload-time = "2026-08-25T02:40:40.524Z" },
+    { url = "https://files.pythonhosted.org/packages/92/fa/7da07d9977a5e292ef602c1bb911514ff8206e85dc09a66961874345d57a/langchain-1.4.0-py3-none-any.whl", hash = "sha256:af1dc0161d30944a52ec7844d9bf890d0497b12ec0703069f3503b4003cbbac3", size = 161534, upload-time = "2026-09-03T16:59:31.154Z" },
 ]
 
 [[package]]