ci: test Elixir 1.17+ only and drop EOL OTP 26 from the matrix - #201
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September 2, 2026 14:11
OTP 26 is end of life, so every OTP 26 row is removed along with the Elixir 1.15 and 1.16 rows that could only run on it. Elixir 1.20 on OTP 28 and 29 is added as the new latest, matching the pinned dev toolchain. The format job moves to 1.20 / OTP 29 as well. Co-Authored-By: Emmanuel Pinault <dev@pinault-family.us> Claude-Session: https://claude.ai/code/session_011dH6kRtZqUkVpoGo79CKYG
Unquoted, YAML parses 1.20 as the float 1.2 and setup-beam cannot resolve it. Co-Authored-By: Emmanuel Pinault <dev@pinault-family.us> Claude-Session: https://claude.ai/code/session_011dH6kRtZqUkVpoGo79CKYG
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Summary
OTP 26 is end of life, so the CI matrix no longer tests it. That also removes Elixir 1.15 and 1.16, which only pair with OTP 26 or older.
New matrix, per the Elixir/OTP compatibility table:
Elixir 1.20 is added as the new "latest" row, matching the dev toolchain pinned in
.tool-versions(#199). The format job moves to 1.20 / OTP 29 too.Note
mix.exsstill declareselixir: "~> 1.14". This PR only changes what CI tests; bumping the declared requirement to~> 1.17is a support change for users and is left as a separate decision.Test plan
🤖 Generated with Claude Code by Emmanuel Pinault
https://claude.ai/code/session_011dH6kRtZqUkVpoGo79CKYG