!!! ONLY APPLIES TO VERSIONS PRIOR TO Sanic v20.12 WHEN USING Python 3.10 !!! Sanic v20.12 officially supports Python versions 3.6, 3.7, 3.8, and 3.9. However, if you accidentally run it with version 3.10 (which is not supported by Sanic 20.12), your server is prone to crashing on an incoming web request. Impact Anyone running Sanic server between 0.1.7 and 20.12 using Python 3.10. Patches "Sanic v20.12.6" (https://github.com/sanic-org/sanic/releases/tag/v20.12.6) Workarounds Use a supported version of Python (v3.6 - v3.9) References «In "asyncio" (https://docs.python.org/3/library/asyncio.html#module-asyncio), the explicit passing of a loop argument has been deprecated and will be removed in version 3.10 for the following: ... "asyncio.Event" (https://docs.python.org/3/library/asyncio-sync.html#asyncio.Event)» "Python 3.8 Release Notes" (https://docs.python.org/3/whatsnew/3.8.html#deprecated) For more information If you have any questions or comments about this advisory: * Open an issue in "the community forums" (https://community.sanicframework.org/) * Ping us on "the Discord server" (https://discord.gg/FARQzAEMAA)