From 806bc593ab541ed25e50695bbb0b4e5988b10e4d Mon Sep 17 00:00:00 2001
From: Sydney Runkle <54324534+sydney-runkle@users.noreply.github.com>
Date: Wed, 27 Aug 2025 13:54:41 -0400
Subject: [PATCH] chore(langchain): revert back to static versioning for now
 (#32719)

---
 .github/workflows/check_core_versions.yml | 29 +++++++++++++++++------
 libs/langchain_v1/pyproject.toml          |  6 +----
 libs/langchain_v1/uv.lock                 |  2 +-
 3 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/.github/workflows/check_core_versions.yml b/.github/workflows/check_core_versions.yml
index 71299549d33..477a4259b3a 100644
--- a/.github/workflows/check_core_versions.yml
+++ b/.github/workflows/check_core_versions.yml
@@ -20,15 +20,30 @@ jobs:
 
       - name: '✅ Verify pyproject.toml & version.py Match'
         run: |
-          PYPROJECT_VERSION=$(grep -Po '(?<=^version = ")[^"]*' libs/core/pyproject.toml)
-          VERSION_PY_VERSION=$(grep -Po '(?<=^VERSION = ")[^"]*' libs/core/langchain_core/version.py)
+          # Check core versions
+          CORE_PYPROJECT_VERSION=$(grep -Po '(?<=^version = ")[^"]*' libs/core/pyproject.toml)
+          CORE_VERSION_PY_VERSION=$(grep -Po '(?<=^VERSION = ")[^"]*' libs/core/langchain_core/version.py)
 
-          # Compare the two versions
-          if [ "$PYPROJECT_VERSION" != "$VERSION_PY_VERSION" ]; then
+          # Compare core versions
+          if [ "$CORE_PYPROJECT_VERSION" != "$CORE_VERSION_PY_VERSION" ]; then
             echo "langchain-core versions in pyproject.toml and version.py do not match!"
-            echo "pyproject.toml version: $PYPROJECT_VERSION"
-            echo "version.py version: $VERSION_PY_VERSION"
+            echo "pyproject.toml version: $CORE_PYPROJECT_VERSION"
+            echo "version.py version: $CORE_VERSION_PY_VERSION"
             exit 1
           else
-            echo "Versions match: $PYPROJECT_VERSION"
+            echo "Core versions match: $CORE_PYPROJECT_VERSION"
+          fi
+
+          # Check langchain_v1 versions
+          LANGCHAIN_PYPROJECT_VERSION=$(grep -Po '(?<=^version = ")[^"]*' libs/langchain_v1/pyproject.toml)
+          LANGCHAIN_INIT_PY_VERSION=$(grep -Po '(?<=^__version__ = ")[^"]*' libs/langchain_v1/langchain/__init__.py)
+
+          # Compare langchain_v1 versions
+          if [ "$LANGCHAIN_PYPROJECT_VERSION" != "$LANGCHAIN_INIT_PY_VERSION" ]; then
+            echo "langchain_v1 versions in pyproject.toml and __init__.py do not match!"
+            echo "pyproject.toml version: $LANGCHAIN_PYPROJECT_VERSION"
+            echo "version.py version: $LANGCHAIN_INIT_PY_VERSION"
+            exit 1
+          else
+            echo "Langchain v1 versions match: $LANGCHAIN_PYPROJECT_VERSION"
           fi
diff --git a/libs/langchain_v1/pyproject.toml b/libs/langchain_v1/pyproject.toml
index 52ddc718f86..d49c5e875e0 100644
--- a/libs/langchain_v1/pyproject.toml
+++ b/libs/langchain_v1/pyproject.toml
@@ -12,16 +12,12 @@ dependencies = [
     "langgraph>=0.6.0",
     "pydantic>=2.7.4",
 ]
-dynamic = ["version"]
 
 name = "langchain"
+version = "1.0.0a1"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 
-[tool.pdm.version]
-source = "file"
-path = "langchain/__init__.py"
-
 [project.optional-dependencies]
 # community = ["langchain-community"]
 anthropic = ["langchain-anthropic"]
diff --git a/libs/langchain_v1/uv.lock b/libs/langchain_v1/uv.lock
index 2daff5ca14b..aeb38ab4817 100644
--- a/libs/langchain_v1/uv.lock
+++ b/libs/langchain_v1/uv.lock
@@ -1431,7 +1431,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.0.0.dev1"
+version = "1.0.0a1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },