ethers is no longer a runtime dependency, so the install footprint is smaller. The SDK now runs in browsers and React Native out of the box. Safe accounts get v0.7 to v0.9 module migration helpers, and error handling gets revert-reason decoding plus stable AA-code parsing. There are two breaking changes worth reading before you upgrade.
Paymaster methods now return a named-field object instead of a tuple or raw UserOperation, and they surface the token quote the paymaster actually applied. CandidePaymasterContext is back as its own argument. A new skipGasEstimation flag lets createUserOperation bypass the bundler round trip when the paymaster is the source of truth for gas.
Safe Unified Account is audited by Nethermind. Calibur joins Simple7702Account as a second EIP-7702 account design. And CandidePaymaster now does parallelizable paymaster signing on EntryPoint v0.9.