diff --git a/pyproject.toml b/pyproject.toml
index 737ff6f0..a1d05d40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ Changelog = "https://github.com/googleapis/langchain-google-cloud-sql-pg-python/
 
 [project.optional-dependencies]
 langgraph = [
-    "langgraph-checkpoint>=3.0.0, <3.1.0"
+    "langgraph-checkpoint>=4.0.0, <4.1.0"
 ]
 test = [
     "black[jupyter]==25.12.0",