Octopus 3.1 will require .NET 4.5

Octopus and Tentacle, originally built on .NET 4.0, are transitioning to .NET 4.5 to leverage its enhanced capabilities, including support for TLS 1.2 and newer libraries such as the latest Azure libraries. Although .NET 4.5 has some minor breaking changes and is not supported on Windows Server 2003, these concerns have diminished over time, as Windows Server 2003 reached its end-of-life and most applications have addressed compatibility issues since .NET 4.5’s release in 2012. This move, outlined by Octopus founder Paul Stovell, will apply starting with Octopus 3.1 and Tentacle 3.1, while previous versions will remain available for those unable to upgrade.