Execution Clients: Geth
Currently Geth is used by >66% of the network.
Client diversity is extremely important for the network health of Ethereum: A bug in a client with a share of over 33% can cause Ethereum to go offline. If the client has a supermajority (>66%), a bug could cause the chain to incorrectly split, potentially leading to slashing.
If at all possible, consider running another client at this time to help protect yourself and the network.