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Optimism to Launch Sepolia Superchain Upgrade 16a on Sep 22

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Optimism rolls out Superchain Upgrade 16a on Sep 22 on Superchain Sepolia, pending governance approval. The upgrade introduces a safer and more flexible approach, replacing U16 and enhancing network maintenance.

Event date: September 22, 2025 UTC
Optimism
@optimismFND
Pending governance approval, Superchain Upgrade 16a will be proposed for execution soon:

📍 sep 22 → Superchain Sepolia
📍 Oct 2 → Superchain Mainnet

This is a maintenance upgrade replacing U16 with a safer, more flexible approach.

Let’s unpack what’s changing (and what’s
OP Price Changes After Event Publication
0.15%
1 day
48.68%
Now (Added 1 month ago)
The event is about to begin
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Added by Alika
Sep 21 20:50 (UTC)
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