From 7d4b42b57235020e6f496fdfebab44c3ca1b1f5b Mon Sep 17 00:00:00 2001
From: Sydney Runkle <54324534+sydney-runkle@users.noreply.github.com>
Date: Thu, 27 Aug 2026 10:25:43 -0700
Subject: [PATCH] release(langchain): 1.3.18 (#39966)
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Patch bump of `langchain` from 1.3.17 to 1.3.18 to prepare a release.

Picks up the `PIIMiddleware` redaction fix (#39894): message content
that is a list of content blocks was being flattened into the string
`repr` of the list during redaction, and redacted messages were losing
fields such as `additional_kwargs`.

Standard three-file bump — `__version__`, `pyproject.toml`, and the
`langchain` entry in `uv.lock`. Running `uv lock` locally also pulled in
unrelated dependency drift (upstream specifier changes and
environment-dependent marker lines), so that churn was reverted and only
the version line kept, matching prior release PRs.

---

*Written with the help of an AI agent (Claude Code).*
---
 libs/langchain_v1/langchain/__init__.py | 2 +-
 libs/langchain_v1/pyproject.toml        | 2 +-
 libs/langchain_v1/uv.lock               | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libs/langchain_v1/langchain/__init__.py b/libs/langchain_v1/langchain/__init__.py
index c09aabaa1c..f48f193e97 100644
--- a/libs/langchain_v1/langchain/__init__.py
+++ b/libs/langchain_v1/langchain/__init__.py
@@ -1,3 +1,3 @@
 """Main entrypoint into LangChain."""
 
-__version__ = "1.3.17"
+__version__ = "1.3.18"
diff --git a/libs/langchain_v1/pyproject.toml b/libs/langchain_v1/pyproject.toml
index edb8589207..6d56f14f55 100644
--- a/libs/langchain_v1/pyproject.toml
+++ b/libs/langchain_v1/pyproject.toml
@@ -21,7 +21,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-version = "1.3.17"
+version = "1.3.18"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langchain-core>=1.6.0,<2.0.0",
diff --git a/libs/langchain_v1/uv.lock b/libs/langchain_v1/uv.lock
index 95eae556dd..c802e8d2c4 100644
--- a/libs/langchain_v1/uv.lock
+++ b/libs/langchain_v1/uv.lock
@@ -1816,7 +1816,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.3.17"
+version = "1.3.18"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },