Fix Ruby 4.0 CI failure on ubuntu-latest #3940
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The ubuntu-latest runner image (20260126.10+) ships a pre-installed Ruby 4.0.1 that causes native extension builds and bundler operations to fail (ruby/rubygems#9284). Remove it from the tool cache to force setup-ruby to download a working build from ruby-builder.
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vinistock
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Feb 6, 2026
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I'm good with the workaround for now, but can we create an issue to remove it later?
Also, let's include our current understanding. Is this a ruby/setup-ruby or a Bundler problem?
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peteryates
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Lifted from ruby-lsp's approach here Shopify/ruby-lsp#3940
peteryates
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Lifted from ruby-lsp's approach here Shopify/ruby-lsp#3940
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Motivation
The
ubuntu-latestrunner image (20260126.10+) ships a pre-installed Ruby 4.0.1 that causes native extension builds and bundler operations to fail. Thechmod +tworkaround from ruby/rubygems#9284 is insufficient — the pre-installed Ruby has deeper issues beyond the sticky bit.Implementation
Remove the pre-installed Ruby 4.0 from
/opt/hostedtoolcachebeforesetup-rubyruns, forcing it to download a working build from ruby-builder.Automated Tests
Existing CI matrix covers this — the Ruby 4.0 on ubuntu-latest job now passes.