We have released updates to multiple supported versions of Microsoft.Data.SqlClient. The updates address several issues.
Microsoft.Data.SqlClient 4.0 and 5.1 are LTS releases. 5.2 is a non-LTS release. All will continue to get fixes and updates until their respective End of Support dates.
To see which versions are LTS versus non-LTS, what that means, and their support timelines, see the Support Lifecycle for Microsoft.Data.SqlClient.
Updates in Microsoft.Data.SqlClient 4.0.6 include:
Fixed Fixed connection to unsubscribe from transaction completion events before returning it to the connection pool #2301 #2435 Fixed AcquireTokenAsync timeout handling for edge cases in ActiveDirectoryAuthenticationProvider #2707 Changed Code