Spack v1.2.0 is out!

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Todd Gamblin

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Jun 21, 2026, 7:21:45 PM (23 hours ago) Jun 21

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Hi all,

Spack v1.2.0 is out, loaded with features and performance improvements!

Highlights:
🧵Parallel installer
🛠️Concretization groups
🧠Concretization caching
📝SBOMs
🔒spack isolate
🏖️ experimental sandboxing

More in the full release notes on GitHub: https://github.com/spack/spack/releases/tag/v1.2.0
UI Demo at https://asciinema.org/a/755827.

If the new installer speeds up any of your workflows, let me know by how much -- we're interested in data from real users.

Thanks to all our now more than 1,600 contributors, and thanks to all of you for being part of the Spack community!