Hi everyone, servant-0.20.1 has a release candidate available!
It is a compatibility release to support aeson-2.2.
You can test it easily by modifying your cabal.project file like this:
packages:
./
https://hackage.haskell.org/package/servant-0.20.1/candidate/servant-0.20.1.tar.gz
and adjusting the version in your freeze file.
Please report problems here: Allow aeson-2.2 by maksbotan · Pull Request #1695 · haskell-servant/servant · GitHub