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Ethereum
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Smart-Contract Development4 min read
Solidity v0.8.31: Osaka EVM Default, CLZ Opcode, and the 0.9.0 Deprecation Clock Starts
The December 2025 Solidity release sets `osaka` as the default EVM target, ships the CLZ opcode from EIP-7939, and fires the starting gun on a wave of 0.9.0 breaking changes — here's what it means for contract authors today.
- solidity
- ethereum
- evm
- fusaka
- smart-contracts