diff --git a/discord/http.py b/discord/http.py
index 1e09607e8..0219c1196 100644
--- a/discord/http.py
+++ b/discord/http.py
@@ -1345,7 +1345,7 @@ class HTTPClient:
             return self.request(r, json=params.payload, params=query, reason=reason)
 
     def join_thread(self, channel_id: Snowflake) -> Response[None]:
-        return self.request(Route('POST', '/channels/{channel_id}/thread-members/@me', channel_id=channel_id))
+        return self.request(Route('PUT', '/channels/{channel_id}/thread-members/@me', channel_id=channel_id))
 
     def add_user_to_thread(self, channel_id: Snowflake, user_id: Snowflake) -> Response[None]:
         return self.request(