Ethereum’s Fusaka upgrade activates tomorrow on Dec. 3, 2025, delivering a sweeping package of scaling, security, and UX improvements aimed at pushing the network into its next era. Unpacking the Fusaka Upgrade Ethereum’s Fusaka upgrade will activate on Dec. 3, 2025, at 21:49:11 UTC, marking the start of epoch 411,392 (slot 13,164,544) and bringing a
