diff --git a/libs/langgraph/pyproject.toml b/libs/langgraph/pyproject.toml
index d679d0761..8f7f885f5 100644
--- a/libs/langgraph/pyproject.toml
+++ b/libs/langgraph/pyproject.toml
@@ -37,7 +37,7 @@ dev = [
     "jupyter",
     "pytest-xdist[psutil]",
     "pytest-repeat",
-    "langchain-core==1.0.0a1",
+    "langchain-core>=1.0.0a1,<2.0.0",
     "langgraph-prebuilt",
     "langgraph-checkpoint",
     "langgraph-checkpoint-sqlite",
diff --git a/libs/langgraph/uv.lock b/libs/langgraph/uv.lock
index 391227d18..e276c50c0 100644
--- a/libs/langgraph/uv.lock
+++ b/libs/langgraph/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.10"
 resolution-markers = [
     "python_full_version >= '3.14'",
@@ -1352,7 +1352,7 @@ requires-dist = [
 dev = [
     { name = "httpx" },
     { name = "jupyter" },
-    { name = "langchain-core", specifier = "==1.0.0a1" },
+    { name = "langchain-core", specifier = ">=1.0.0a1,<2.0.0" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },