diff --git a/stubs/greenlet/METADATA.toml b/stubs/greenlet/METADATA.toml
index 3e0cb4f94..7b7346c3e 100644
--- a/stubs/greenlet/METADATA.toml
+++ b/stubs/greenlet/METADATA.toml
@@ -1,2 +1,2 @@
-version = "2.0.*"
+version = "3.0.*"
 upstream_repository = "https://github.com/python-greenlet/greenlet"
diff --git a/stubs/greenlet/greenlet/_greenlet.pyi b/stubs/greenlet/greenlet/_greenlet.pyi
index e3ec8a53c..e873b1083 100644
--- a/stubs/greenlet/greenlet/_greenlet.pyi
+++ b/stubs/greenlet/greenlet/_greenlet.pyi
@@ -63,6 +63,10 @@ class greenlet:
     @staticmethod
     def settrace(__callback: _TraceCallback | None) -> _TraceCallback | None: ...
 
+class UnswitchableGreenlet(greenlet):  # undocumented
+    force_switch_error: bool
+    force_slp_switch_error: bool
+
 def enable_optional_cleanup(__enabled: bool) -> None: ...
 def get_clocks_used_doing_optional_cleanup() -> int: ...
 def get_pending_cleanup_count() -> int: ...