Tidal Cycles is a composite software. To upgrade it, it is highly recommended to upgrade everything along with the pattern library (the text editor and the SuperDirt audio engine as well). Each time a new version of Tidal is released, a new version of SuperDirt will likely follow, etc...
Upgrade tidal with the following from a terminal window (Linux/MacOS/Windows):
If you're using an older version of haskell you might have to miss the
--lib off the above command.
Your text editor might refer to the Tidal Cycles plugin as an extension or as a package. Check the sidebar to get more information about ways to update your favorite text editor.
To upgrade the SuperDirt sound synthesiser/sampler, open SuperCollider, and paste the following command in the interactive editor. Select the text and press Shift+Enter:
You'll need to recompile the class library. You can do this either by simply restarting the software or via the Recompile class library entry on the Language top-bar menu.