Version 13.0 contains a new version (V5) of the protocol environment, which is the set of functions that protocols can call. This new version is used by protocol Jakarta, which is a proposal for the successor of Ithaca. This release also contains Jakarta itself as well as its daemons.
Note that starting from Jakarta, the baker requires you to specify your vote for the liquidity baking toggle, see the changelog.
To update from sources:
git checkout v13.0
rm -rf _opam _build
eval $(opam env)
If you are using Docker instead, use the
v13.0 Docker images of Tezos.