Release Notes for [release-2026-05-15_10-22-base](https://github.com/dfinity/ic/tree/release-2026-05-15_10-22-base) (`c7552446d8adacafd4329e1ff2c26d43b3e530a7`)
This release is based on changes since [release-2026-05-07_04-27-base](https://dashboard.internetcomputer.org/release/62e841d27ea12451f504e74c54843b7cbf93ca4d) (`62e841d27ea12451f504e74c54843b7cbf93ca4d`).

Please note that some commits may be excluded from this release if they're not relevant, or not modifying the GuestOS image.
Additionally, descriptions of some changes might have been slightly modified to fit the release notes format.

To see a full list of commits added since last release, compare the revisions on [GitHub](https://github.com/dfinity/ic/compare/release-2026-05-07_04-27-base...release-2026-05-15_10-22-base).
## Features:
* [`080e7ec77`](https://github.com/dfinity/ic/commit/080e7ec77) Node: Tighten GuestOS target version verification ([#10181](https://github.com/dfinity/ic/pull/10181))
* [`6ebbb28b2`](https://github.com/dfinity/ic/commit/6ebbb28b2) Node: Update images to 26.04 ([#10176](https://github.com/dfinity/ic/pull/10176))
* [`adb8f828e`](https://github.com/dfinity/ic/commit/adb8f828e) Node: use prebuilt protoc ([#10164](https://github.com/dfinity/ic/pull/10164))
* [`a1dd11827`](https://github.com/dfinity/ic/commit/a1dd11827) Node: Update base images to 26.04 ([#10149](https://github.com/dfinity/ic/pull/10149))
## Bugfixes:
* [`f40bb2818`](https://github.com/dfinity/ic/commit/f40bb2818) Node: Roll forward #10186 ([#10205](https://github.com/dfinity/ic/pull/10205))
* [`b68257d0b`](https://github.com/dfinity/ic/commit/b68257d0b) Node: revert "fix: Fix some issues in detached LUKS header exchange ([#10179](https://github.com/dfinity/ic/pull/10179))" ([#10186](https://github.com/dfinity/ic/pull/10186))
* [`cdaafdd94`](https://github.com/dfinity/ic/commit/cdaafdd94) Node: Fix some issues in detached LUKS header exchange ([#10179](https://github.com/dfinity/ic/pull/10179))
* [`478d3aaa6`](https://github.com/dfinity/ic/commit/478d3aaa6) Node: Fix LUKS keyslot params ([#10170](https://github.com/dfinity/ic/pull/10170))
## Chores:
* [`6c9d71877`](https://github.com/dfinity/ic/commit/6c9d71877) Node: Update Base Image Refs [2026-05-14-0855] ([#10225](https://github.com/dfinity/ic/pull/10225))
* [`b96124dae`](https://github.com/dfinity/ic/commit/b96124dae) Node: support allocating testnets to the local DC ([#10122](https://github.com/dfinity/ic/pull/10122))
* [`36b8b7114`](https://github.com/dfinity/ic/commit/36b8b7114) Node: Update Base Image Refs [2026-05-08-0150] ([#10127](https://github.com/dfinity/ic/pull/10127))
* [`dfe4dfb0d`](https://github.com/dfinity/ic/commit/dfe4dfb0d) Node: Update Base Image Refs [2026-05-07-0853] ([#10110](https://github.com/dfinity/ic/pull/10110))
## Refactoring:
## Tests:
## Other changes:
Full list of changes (including the ones that are not relevant to GuestOS) can be found on [GitHub](https://github.com/dfinity/dre/blob/5b7cb27f0276e864037578a368329b14d145f401/replica-releases/c7552446d8adacafd4329e1ff2c26d43b3e530a7.md).

# IC-OS Verification

To build and verify the IC-OS GuestOS disk image, after installing curl if necessary (`sudo apt install curl`), run:

```
# From https://github.com/dfinity/ic#verifying-releases
curl -fsSL https://raw.githubusercontent.com/dfinity/ic/c7552446d8adacafd4329e1ff2c26d43b3e530a7/ci/scripts/repro-check | python3 - -c c7552446d8adacafd4329e1ff2c26d43b3e530a7 --guestos
```

The two SHA256 sums printed above from a) the downloaded CDN image and b) the locally built image, must be identical, and must match the SHA256 from the payload of the NNS proposal.

While not required for this NNS proposal, as we are only electing a new GuestOS version here, you have the option to verify the build reproducibility of the HostOS by passing `--hostos` to the script above instead of `--guestos`, or the SetupOS by passing `--setupos`.
