matplotlib
diff --git a/‎doc/api/next_api_changes/deprecations/24208-AL.rst
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+3Lines changed: 3 additions & 0 deletions b/‎doc/api/next_api_changes/deprecations/24208-AL.rst
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+3Lines changed: 3 additions & 0 deletions
diff --git a/‎lib/matplotlib/backends/backend_webagg.py
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+3-1Lines changed: 3 additions & 1 deletion b/‎lib/matplotlib/backends/backend_webagg.py
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+3-1Lines changed: 3 additions & 1 deletion
@@ -0,0 +1,3 @@
+``backend_webagg.ServerThread`` is deprecated
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+... with no replacement.
@@ -40,12 +40,14 @@
     TimerAsyncio, TimerTornado)
 
 
+@mpl._api.deprecated("3.7")
 class ServerThread(threading.Thread):
     def run(self):
         tornado.ioloop.IOLoop.instance().start()
 
 
-webagg_server_thread = ServerThread()
+webagg_server_thread = threading.Thread(
+    target=lambda: tornado.ioloop.IOLoop.instance().start())
 
 
 class FigureManagerWebAgg(core.FigureManagerWebAgg):