JoinMarket is software to create a special kind of bitcoin transaction called a CoinJoin transaction. Widespread use of JoinMarket improves bitcoin's fungibility and privacy. This implementation of JoinMarket also implements PayJoin.
"This release includes removal of Python 3.6 (which had been end-of-life since end of 2021), so now Python 3.7+ is minimum requirement."
"This release also includes signalling BIP125 opt-in RBF all non-coinjoin send transactions by default and bumpfee.py script to create RBF replacements to speed up unconfirmed transactions. And fee estimator will now only randomize transaction fee rate upwards, not below block target estimation or manually set fee rate."
"There is new RPC API endpoints, handling of BIP21 bitcoin: URIs with multiple duplicating keys and various bugfixes and minor changes."