We will be migrating the solc binaries, currently hosted on the solc-bin repository and mirrored on Amazon S3, to Cloudflare R2. This transition will offer more efficient and cost-effective storage for the historical solc binaries.
Important Notice: The migration will begin tomorrow (09/12/2025) at 14:00 CET and is expected to take only a few minutes. During the process, users may experience brief periods of downtime or unavailability as DNS records propagate across the internet.
What to expect:
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Domains currently pointing to S3 (https://binaries.soliditylang.org) will be updated to point to Cloudflare R2
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This change involves a straightforward DNS update
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While the DNS change is propagating, some users may encounter interruptions when attempting to access the binaries
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This is a temporary issue and should resolve once the changes are fully propagated
Recommendation:
We recommend planning accordingly for this brief downtime, especially if your workflow depends on accessing the solc binaries during this time.
Thank you for your understanding. Should you have any questions or concerns, please don’t hesitate to reach out to us here.