On Friday, September 18, 2026, at around 05:01 UTC, the Solana network tightens its own beat: a slot will then last 250 milliseconds instead of 300. The switch for it is already set and takes effect automatically at the boundary into epoch 1037. For you as a holder of Solana, that mainly means three things: delegations and unstaking take effect faster, staking rewards arrive more often and in smaller portions, and the window in which a signed transaction stays valid shrinks to roughly 38 seconds. If your SOL simply sits on an exchange, you need do nothing. If you sign offline, delegate, or run a validator yourself, read this to the end.