diff --git a/libs/checkpoint-postgres/uv.lock b/libs/checkpoint-postgres/uv.lock
index 343c49a2d..41639dc82 100644
--- a/libs/checkpoint-postgres/uv.lock
+++ b/libs/checkpoint-postgres/uv.lock
@@ -313,7 +313,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.38" },
+    { name = "langchain-core", specifier = ">=0.2.38,<1.0.0" },
     { name = "ormsgpack", specifier = ">=1.10.0" },
 ]
 
diff --git a/libs/checkpoint-sqlite/uv.lock b/libs/checkpoint-sqlite/uv.lock
index c99bed22b..3d3a1d82e 100644
--- a/libs/checkpoint-sqlite/uv.lock
+++ b/libs/checkpoint-sqlite/uv.lock
@@ -325,7 +325,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.38" },
+    { name = "langchain-core", specifier = ">=0.2.38,<1.0.0" },
     { name = "ormsgpack", specifier = ">=1.10.0" },
 ]
 
diff --git a/libs/checkpoint/pyproject.toml b/libs/checkpoint/pyproject.toml
index 647e757e0..03ecec640 100644
--- a/libs/checkpoint/pyproject.toml
+++ b/libs/checkpoint/pyproject.toml
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langchain-core>=0.2.38",
+    "langchain-core>=0.2.38,<1.0.0",
     "ormsgpack>=1.10.0",
 ]
 
diff --git a/libs/checkpoint/uv.lock b/libs/checkpoint/uv.lock
index 4a39de103..12cade78c 100644
--- a/libs/checkpoint/uv.lock
+++ b/libs/checkpoint/uv.lock
@@ -350,7 +350,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.38" },
+    { name = "langchain-core", specifier = ">=0.2.38,<1.0.0" },
     { name = "ormsgpack", specifier = ">=1.10.0" },
 ]
 
diff --git a/libs/langgraph/pyproject.toml b/libs/langgraph/pyproject.toml
index 54506837b..85a0ff338 100644
--- a/libs/langgraph/pyproject.toml
+++ b/libs/langgraph/pyproject.toml
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langchain-core>=0.1",
+    "langchain-core>=0.1,<1.0.0",
     "langgraph-checkpoint>=2.1.0,<3.0.0",
     "langgraph-sdk>=0.2.0,<0.3.0",
     "langgraph-prebuilt>=0.6.0,<0.7.0",
diff --git a/libs/langgraph/uv.lock b/libs/langgraph/uv.lock
index f4a01637c..069caa3b0 100644
--- a/libs/langgraph/uv.lock
+++ b/libs/langgraph/uv.lock
@@ -1233,7 +1233,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.1" },
+    { name = "langchain-core", specifier = ">=0.1,<1.0.0" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-prebuilt", editable = "../prebuilt" },
     { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -1310,7 +1310,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.38" },
+    { name = "langchain-core", specifier = ">=0.2.38,<1.0.0" },
     { name = "ormsgpack", specifier = ">=1.10.0" },
 ]
 
@@ -1442,7 +1442,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.3.67" },
+    { name = "langchain-core", specifier = ">=0.3.67,<1.0.0" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
 ]
 
diff --git a/libs/prebuilt/pyproject.toml b/libs/prebuilt/pyproject.toml
index f7212652f..fdf4cea11 100644
--- a/libs/prebuilt/pyproject.toml
+++ b/libs/prebuilt/pyproject.toml
@@ -13,7 +13,7 @@ license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
     "langgraph-checkpoint>=2.1.0,<3.0.0",
-    "langchain-core>=0.3.67",
+    "langchain-core>=0.4.0,<1.0.0",
 ]
 
 [project.urls]
diff --git a/libs/prebuilt/uv.lock b/libs/prebuilt/uv.lock
index 679ab1dfa..eb61610e7 100644
--- a/libs/prebuilt/uv.lock
+++ b/libs/prebuilt/uv.lock
@@ -329,7 +329,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.1" },
+    { name = "langchain-core", specifier = ">=0.1,<1.0.0" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-prebuilt", editable = "." },
     { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -376,7 +376,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.38" },
+    { name = "langchain-core", specifier = ">=0.2.38,<1.0.0" },
     { name = "ormsgpack", specifier = ">=1.10.0" },
 ]
 
@@ -485,7 +485,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.3.67" },
+    { name = "langchain-core", specifier = ">=0.3.67,<1.0.0" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
 ]