Anchor 1.2.1, released on GitHub on Oct. 6, 2026, lets Solana programs built with the Anchor framework use Solana v4 crates through an opt-in feature. NFA.
Release Information
Anchor 1.2.1, the Solana program framework, launched on GitHub on Oct. 6, 2026, per the release page. The release page carries Anchor CLI builds for Apple silicon and Intel macOS, Windows and Linux. Notes are on the Anchor website and GitHub, with the changelog naming notable changes and their pull requests.
Feature Details
Per the changelog, Anchor's lang crate adds support for Solana v4 crates. That support comes through a solana-v4 feature, so projects turn it on themselves. The 1.2.1 changelog shows no breaking changes.
Dependency Changes
Per the linked pull request, the change moves Anchor's Solana and Agave dependencies from the 3.x line to 4.3. The signer and keypair crates stay on 3.x, since the other Solana 4.3 crates still use those versions. The bump stops at 4.3 so Anchor does not depend on pre-release crates.
Compatibility Notes
The 1.2.1 changelog shows no breaking changes. Per the changelog, the previous release, Anchor 1.2.0, came out on Sep. 4, 2026. Projects do not have to switch because Solana v4 crate support comes through an opt-in solana-v4 feature, per the changelog.
Download Options
The release page carries Anchor CLI builds for Apple silicon and Intel macOS, Windows and Linux. Notes are on the Anchor website and GitHub, with the changelog naming notable changes and their pull requests. Anchor 1.2.1, the Solana program framework, launched on GitHub on Oct. 6, 2026, per the release page.
Previous Context
Per the changelog, the previous release, Anchor 1.2.0, came out on Sep. 4, 2026. Anchor 1.2.1, the Solana program framework, launched on GitHub on Oct. 6, 2026, per the release page. The release page carries Anchor CLI builds for Apple silicon and Intel macOS, Windows and Linux.
What Projects Receive
Per the changelog, Anchor's lang crate adds support for Solana v4 crates. That support comes through a solana-v4 feature, so projects turn it on themselves. Per the linked pull request, the change moves Anchor's Solana and Agave dependencies from the 3.x line to 4.3. The signer and keypair crates stay on 3.x, since the other Solana 4.3 crates still use those versions.
Stable Approach
The bump stops at 4.3 so Anchor does not depend on pre-release crates. The 1.2.1 changelog shows no breaking changes. Per the changelog, the previous release, Anchor 1.2.0, came out on Sep. 4, 2026. Anchor 1.2.1, the Solana program framework, launched on GitHub on Oct. 6, 2026, per the release page.
Access Points
The release page carries Anchor CLI builds for Apple silicon and Intel macOS, Windows and Linux. Notes are on the Anchor website and GitHub, with the changelog naming notable changes and their pull requests. Per the changelog, Anchor's lang crate adds support for Solana v4 crates.