diff --git a/libs/langchain_v1/langchain/__init__.py b/libs/langchain_v1/langchain/__init__.py
index ef14fa27bc..bdb8506037 100644
--- a/libs/langchain_v1/langchain/__init__.py
+++ b/libs/langchain_v1/langchain/__init__.py
@@ -1,3 +1,3 @@
 """Main entrypoint into LangChain."""
 
-__version__ = "1.4.0a1"
+__version__ = "1.4.0a2"
diff --git a/libs/langchain_v1/pyproject.toml b/libs/langchain_v1/pyproject.toml
index b14d55b15f..73c42a02f0 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 = "1.4.0a1"
+version = "1.4.0a2"
 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 99c84d4cfd..62e7f895b3 100644
--- a/libs/langchain_v1/uv.lock
+++ b/libs/langchain_v1/uv.lock
@@ -2286,7 +2286,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.4.0a1"
+version = "1.4.0a2"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },