Upgrade from Debian Bullseye to Debia Bookworm

Dear node operators,

From stable2612 2026-12-21 on we will no longer use Debian Bullseye (Debian 11) as the base operating-system image for building our CI and release binaries.

We are moving to Debian Bookworm (Debian 12), this change ensures the environment continues to receive security updates while maintaining broad compatibility for pre-built binaries.

After this release, operators running the binary on OS versions below Debian 12 and Ubuntu 22.04. won’t be able to run the binary. Operators running the Docker image should encounter no issues.

If you face error messages like the one below, please make sure to upgrade your OS.

polkadot: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version \`GLIBCXX_3.4.29' not found (required by polkadot)

polkadot: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version \`GLIBCXX_3.4.30' not found (required by polkadot)

polkadot: /lib/x86_64-linux-gnu/libc.so.6: version \`GLIBC_2.32' not found (required by polkadot)

polkadot: /lib/x86_64-linux-gnu/libc.so.6: version \`GLIBC_2.33' not found (required by polkadot)

polkadot: /lib/x86_64-linux-gnu/libc.so.6: version \`GLIBC_2.34' not found (required by polkadot)
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