diff --git a/stubs/rx/internal/concurrency.pyi b/stubs/rx/internal/concurrency.pyi
deleted file mode 100644
--- a/stubs/rx/internal/concurrency.pyi
+++ /dev/null
@@ -1,23 +0,0 @@
-# Stubs for rx.internal.concurrency (Python 3)
-#
-# NOTE: This dynamically typed stub was automatically generated by stubgen.
-
-from typing import Any
-
-class RLock:
-    def locked(self): ...
-    def __enter__(self) -> None: ...
-    def __exit__(self, type: Any, value: Any, traceback: Any) -> None: ...
-
-class Event:
-    def is_set(self): ...
-    def set(self) -> None: ...
-    def clear(self) -> None: ...
-    def wait(self) -> None: ...
-
-class Condition:
-    def wait(self) -> None: ...
-    def aquire(self) -> None: ...
-    def release(self) -> None: ...
-    def notify(self, n: int = ...) -> None: ...
-    def notify_all(self) -> None: ...