diff --git a/libs/langchain_v1/pyproject.toml b/libs/langchain_v1/pyproject.toml
index 26d0ea632ec..2cd9a94f528 100644
--- a/libs/langchain_v1/pyproject.toml
+++ b/libs/langchain_v1/pyproject.toml
@@ -94,6 +94,7 @@ test_integration = [
 
 [tool.uv]
 constraint-dependencies = ["urllib3>=2.6.3", "pygments>=2.20.0"]
+prerelease = "allow"
 
 [tool.uv.sources]
 langchain-core = { path = "../core", editable = true }
diff --git a/libs/langchain_v1/uv.lock b/libs/langchain_v1/uv.lock
index 3c4260e89b9..961a34b5f54 100644
--- a/libs/langchain_v1/uv.lock
+++ b/libs/langchain_v1/uv.lock
@@ -14,6 +14,9 @@ resolution-markers = [
     "python_full_version < '3.11' and platform_python_implementation == 'PyPy'",
 ]
 
+[options]
+prerelease-mode = "allow"
+
 [manifest]
 constraints = [
     { name = "pygments", specifier = ">=2.20.0" },
@@ -2608,7 +2611,7 @@ wheels = [
 
 [[package]]
 name = "langgraph"
-version = "1.2.0a5"
+version = "1.2.0a7"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
@@ -2618,22 +2621,22 @@ dependencies = [
     { name = "pydantic" },
     { name = "xxhash" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/6c/76/d09367be5481415018366f059e06a7e3850d6a3b744c0a57cecd5a7a42e5/langgraph-1.2.0a5.tar.gz", hash = "sha256:b5cd7e9eac3a615120414b1621754ff4f621bf67e90bb4630b257beab03e61ec", size = 670110, upload-time = "2026-05-01T18:07:48.197Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d9/ce/df390d7174df1a089cee99aadc004f9559a99cf672d01578c66782a7bcb4/langgraph-1.2.0a7.tar.gz", hash = "sha256:3dfb5a97aa991b77c9f8654d93273318e91788bafc3ba26f203a042447071c45", size = 678797, upload-time = "2026-05-04T19:35:24.443Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b1/2f/5c02e8b3bef032c21ed13c950e6fcfb8688535010d8603f8f8239c954f63/langgraph-1.2.0a5-py3-none-any.whl", hash = "sha256:62b24c04e0a7f1db9cd1e4e1eecb1f944927ebec5279c5ceaddf9a77f08431dd", size = 227367, upload-time = "2026-05-01T18:07:46.268Z" },
+    { url = "https://files.pythonhosted.org/packages/c0/c3/d73266b5801a752346cb3e235b506042a3a45d3bcb99d6f73dc649c48087/langgraph-1.2.0a7-py3-none-any.whl", hash = "sha256:b3ede4d3d27efd10dcc955b62b3ba43c0b0a2a963b150b41fc2e12e411350c92", size = 229121, upload-time = "2026-05-04T19:35:22.347Z" },
 ]
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.0a3"
+version = "4.1.0a4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "ormsgpack" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e3/43/b1009af9fe5e90f611b998bb8df6435ceec5c7b980057a17e0335493d027/langgraph_checkpoint-4.1.0a3.tar.gz", hash = "sha256:5bdcc807cef760c1b49adb9f0bc6cec02ed06ee84ad162c7cc133490ea60de1b", size = 180097, upload-time = "2026-05-01T15:26:38.528Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/b4/dc/53f2eb893a268e61f225b20be0e021152fb955b076a1366857ba1c3f46d3/langgraph_checkpoint-4.1.0a4.tar.gz", hash = "sha256:be3d0c702fa6e31f3820c47dbfa272c98c17aec2cdf050b8c488f3522d3ec8fa", size = 179885, upload-time = "2026-05-04T19:32:18.611Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/5c/7c/22414710fc77b78ce7b9a876897bbdee1761d88f586fc037ed094a3572cd/langgraph_checkpoint-4.1.0a3-py3-none-any.whl", hash = "sha256:101d746cd9299f8da5576509930f3d52f6c67190e129a0954594da6daf22eb35", size = 55009, upload-time = "2026-05-01T15:26:37.505Z" },
+    { url = "https://files.pythonhosted.org/packages/e9/c7/78dbe4bc02bb30c8a2520269bf146ecd2b17903586894b74eb95caef674c/langgraph_checkpoint-4.1.0a4-py3-none-any.whl", hash = "sha256:70e405bef16a51fcc831f78bda1e85cccc812ca5754685b44af03f84935917f1", size = 54664, upload-time = "2026-05-04T19:32:17.389Z" },
 ]
 
 [[package]]