PostWe were made aware that the change to start_webhook in the recent release v13.4 was unintentionally breaking.

We were made aware that the change to start_webhook in the recent release v13.4 was unintentionally breaking. More precisely, if you have something like updater.start_webhook(...) updater.bot.set_webhook('https://python-telegram-bot.org') in your code, you will have to replace that with updater.start_webhook(..., webhook_url='https://python-telegram-bot.org') Because the change is easy to notice (updater.set_webhook will just fail with an error) and the required change is minimal, we will not revert the change. Apologies for the inconvenience.