A critical post fork hotfix is needed.
Upgrade is mandatory. Failing to upgrade will get you on a stalled chain.
More info on our discord.
Here is a quick script to upgrade from a default 126.96.36.199:
cd rm master.zip rm -rd Bismuth-master wget https://github.com/bismuthfoundation/Bismuth/archive/master.zip unzip master.zip rm Bismuth-master/config.txt cp -a ./Bismuth-master/. ./Bismuth/
Then restart the node, fi
cd Bismuth;python3.7 commands.py stop