diff --git a/libs/langgraph/langgraph/graph/state.py b/libs/langgraph/langgraph/graph/state.py
index 93fb1c526..b207daa89 100644
--- a/libs/langgraph/langgraph/graph/state.py
+++ b/libs/langgraph/langgraph/graph/state.py
@@ -126,7 +126,7 @@ def _check_delta_channel_api_support(channels: Mapping[str, Any]) -> None:
     """Raise if a `DeltaChannel` graph runs under an API server too old to support it.
 
     `DeltaChannel` reconstruction needs server-side support added in
-    `langgraph-api>=0.9.0`, so we raise at compile time when an older API
+    `langgraph-api>=0.10.0`, so we raise at compile time when an older API
     server is installed. Skipped when `langgraph-api` is absent (local
     execution) or the graph has no delta channel.
     """
@@ -136,9 +136,9 @@ def _check_delta_channel_api_support(channels: Mapping[str, Any]) -> None:
         api_version = metadata.version("langgraph-api")
     except metadata.PackageNotFoundError:
         return
-    if Version(api_version) < Version("0.9.0"):
+    if Version(api_version) < Version("0.10.0"):
         raise RuntimeError(
-            f"`DeltaChannel` requires `langgraph-api>=0.9.0`, but {api_version} "
+            f"`DeltaChannel` requires `langgraph-api>=0.10.0`, but {api_version} "
             "is installed. Upgrade with `pip install -U langgraph-api`."
         )
 
diff --git a/libs/langgraph/tests/test_delta_channel_api_support.py b/libs/langgraph/tests/test_delta_channel_api_support.py
index 938cde9ef..ef477b7c1 100644
--- a/libs/langgraph/tests/test_delta_channel_api_support.py
+++ b/libs/langgraph/tests/test_delta_channel_api_support.py
@@ -1,7 +1,7 @@
 """Compile-time check that `DeltaChannel` graphs run under a supported API server.
 
 `DeltaChannel` reconstruction relies on server-side support added in
-`langgraph-api>=0.9.0`. When running under an older API server, delta channels
+`langgraph-api>=0.10.0`. When running under an older API server, delta channels
 fail at runtime, so `StateGraph.compile` raises with an upgrade hint. The check
 is skipped when `langgraph-api` is not installed (local execution).
 """
@@ -57,13 +57,19 @@ def api_version(monkeypatch: pytest.MonkeyPatch):
 
 
 def test_delta_graph_raises_for_old_api(api_version) -> None:
-    api_version("0.8.9")
-    with pytest.raises(RuntimeError, match="requires `langgraph-api>=0.9.0`"):
+    api_version("0.9.9")
+    with pytest.raises(RuntimeError, match="requires `langgraph-api>=0.10.0`"):
+        _delta_graph().compile()
+
+
+def test_delta_graph_raises_for_api_release_candidate(api_version) -> None:
+    api_version("0.10.0rc1")
+    with pytest.raises(RuntimeError, match="requires `langgraph-api>=0.10.0`"):
         _delta_graph().compile()
 
 
 def test_delta_graph_ok_for_min_api(api_version) -> None:
-    api_version("0.9.0")
+    api_version("0.10.0")
     _delta_graph().compile()