https://ammblog.azurewebsites.net/2022/10/01/9upgrade-your-azure-cache-for-redis-instances-to-use-redis-version-6-by-30-june-2023/
9Upgrade your Azure Cache for Redis instances to use Redis version 6 by 30 June 2023 | Mashford's...
Sep 30, 2022 - Azure Cache for Redis instances running on Redis version 4 need to be upgraded by 30 June 2023. Source: Azure