tzdata on macos-latest is very old

[mattjohnsonpint]

Description

On macOS, the IANA tzdata version can be found with:

cat /usr/share/zoneinfo/+VERSION 

• With the macos-15-intel runner image, the version is reported as 2025b (released March 2025)
• With the macos-latest runner image, the version is reported as 2024a (released Februrary 2024)

Apple includes tzdata updates as part of the OS build, so it should have the latest version - but for some reason it doesn't.

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 22.04
• Ubuntu 24.04
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• macOS 26 Arm64
• Windows Server 2019
• Windows Server 2022
• Windows Server 2025

Image version and build link

Operating System
macOS
15.7.1
24G231
Runner Image
Image: macos-15-arm64
Version: 20251021.0066

https://github.com/mattjohnsonpint/TimeZoneConverter/actions/runs/18953342534/job/54123553535#step:4:8

Is it regression?

unknown

Expected behavior

The tzdata version should be 2025b

Actual behavior

The tzdata version is 2024a

Repro steps

Include the following in a build step and look at the output:

cat /usr/share/zoneinfo/+VERSION 

Compare macos-latest vs macos-15-intel.

[shamil-mubarakshin]

Hey @mattjohnsonpint, thanks for reporting the issue. We will check and get back