Starknet's underlying ZK-STARK technology relies on hash-based cryptography and programmable accounts that allow adopting new signature schemes without a protocol upgrade.

From the articleStarknet Voters Back Post-Quantum L1 ResearchAlso in Starknet Opens Layer 1 Research After 93.5% Poll Vote, Targets Quantum Safety by 2027 - Unchained, Starknet Voters Back Post-Quantum L1 Research, Starknet Moves Toward Post-Quantum Layer 1 as Voters Back Ethereum Split, Starknet's proposed Ethereum exit wins 93.52% support for further research, Starknet community overwhelmingly backs research into becoming an independent post-quantum Layer 1