Microsoft has reminded customers that some editions of Windows 10, version 1909 will reach end of service in May 2021. Microsoft stops providing technical support and fixes for newly discovered issues and security vulnerabilities. Microsoft advises customers still using end-of-service software to upgrade as soon as possible to the latest on-premise or cloud versions to keep their systems safe from attacks. Microsoft published an emergency update to fix blue screen crashes when making WPA3 Wi-Fi connections on devices running Windows 10 and Windows Server.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-windows-10-1909-reaches-end-of-service-in-may/