diff --git a/pyproject.toml b/pyproject.toml
index 847ac7be..2ab081a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "PyJWT>=2.12.1",
     "cryptography>=48.0.1",
     "langgraph-sdk>=0.4.2",
-    "langchain>=1.3.4",
+    "langchain>=1.3.9",
     "langgraph>=1.1.10",
     "markdownify>=1.2.2",
     "langchain-anthropic>=1.4.6",
diff --git a/uv.lock b/uv.lock
index 6e5fbcc6..93f34c34 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1396,16 +1396,16 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.3.4"
+version = "1.3.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "langgraph" },
     { name = "pydantic" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/36/3f/034eb6cbef90bfccc89b7f8ed0c1d853dc9cb0bea17c7a269534c647ba3a/langchain-1.3.4.tar.gz", hash = "sha256:d6e0654c22848925534f5c0a706f9be481bb09a619ec60a738fbd1e5502e457a", size = 606617, upload-time = "2026-06-02T20:04:49.411Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/56/7c/651d0dc4913a7a892156c03dd343b99cfe19ee729e6911ab1f4fe7567b8b/langchain-1.3.9.tar.gz", hash = "sha256:9b14ef0db9ef314299ded858b22ca2a40b8f1b05c8c9cb6b82d53a53075fef00", size = 631514, upload-time = "2026-06-12T16:53:27.083Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a5/29/9ffe99c7dc4891a0215ec59c423bea320f943c08a231bc5bae392a438a83/langchain-1.3.4-py3-none-any.whl", hash = "sha256:e51b05ab23d056bc6bf2d97d8c694fb92d6d5765126fef74565d007c27581672", size = 125286, upload-time = "2026-06-02T20:04:48.13Z" },
+    { url = "https://files.pythonhosted.org/packages/b7/55/3481619d21b9bdfbfda8680fba5cfc6cfe926789b8eaaad95353078cfa20/langchain-1.3.9-py3-none-any.whl", hash = "sha256:4af49ad1095799e4408b489fb79d4b8b49292453618b202d8a697fca59bb6871", size = 132873, upload-time = "2026-06-12T16:53:25.489Z" },
 ]
 
 [[package]]
@@ -2030,7 +2030,7 @@ requires-dist = [
     { name = "fastapi", specifier = ">=0.136.3" },
     { name = "fireworks-ai", specifier = ">=1.2.0a71" },
     { name = "httpx", specifier = ">=0.28.1" },
-    { name = "langchain", specifier = ">=1.3.4" },
+    { name = "langchain", specifier = ">=1.3.9" },
     { name = "langchain-anthropic", specifier = ">=1.4.6" },
     { name = "langchain-daytona", specifier = ">=0.0.5" },
     { name = "langchain-fireworks", specifier = ">=1.4.2" },