If so, changing your passwords wouldn't help. You would need to use new encryption algorithms which aren't implemented in KeePass yet. https://en.wikipedia.org

If so, changing your passwords wouldn't help. You would need to use new encryption algorithms which aren't implemented in KeePass yet. https://en.wikipedia.org/wiki/Post-quantum_cryptography https://en.wikipedia.org/wiki/Post-quantum_cryptography However, the biggest problems are about public-key encryption algorithms like RSA, which are broken much more readily by quantum computing than symmetric-key algorithms like AES. The security of KeePass password databases is mainly protected by symmetric encryption rather than public-key encryption, and the speedup achieved by quantum computers isn't as significant. Perhaps it's already fairly safe? Another thing to think about is whether Dropbox would expose your encrypted files to an adversary who could then perform a quantum cryptanalysis (either via attacks on the cryptography used to protect the data in transit between you and Dropbox—which does include public-key encryption, unlike KeePass itself!), or by trying to compromise or coerce Dropbox itself into turning over your data. The existence of a cryptanalytic attack against some algorithm doesn't necessarily always mean that there will be adversaries in a position to use that attack against each user and each message, session, or file.