In 3.2.3 RubyGems started to use the Compact Index API (commit, PR, changelog).
RubyGems.org Dependency API Deprecation
Dependency API Deprecation Delayed
RFC
a.sh
docker run --rm -it ruby:2.6.10-alpine3.15 sh -euxc '
gem update --system 3.2.2
sed -Ei "/rescue Gem::RemoteFetcher::FetchError/aputs \"-- fallback\"" /usr/local/lib/ruby/site_ruby/2.6.0/rubygems/source.rb
time gem install mina
gem uninstall -x mina
gem update --system 3.2.3
sed -Ei "/rescue Gem::RemoteFetcher::FetchError/aputs \"-- fallback\"" /usr/local/lib/ruby/site_ruby/2.6.0/rubygems/source.rb
time gem install mina
'$ sh a.sh
+ gem update --system 3.2.2
+ sed -Ei '/rescue Gem::RemoteFetcher::FetchError/aputs "-- fallback"' /usr/local/lib/ruby/site_ruby/2.6.0/rubygems/source.rb
+ time gem install mina
-- fallback
Fetching mina-1.2.5.gem
Successfully installed mina-1.2.5
1 gem installed
real 1m 15.98s
user 1m 11.28s
sys 0m 0.72s
+ gem uninstall -x mina
+ gem update --system 3.2.3
+ sed -Ei '/rescue Gem::RemoteFetcher::FetchError/aputs "-- fallback"' /usr/local/lib/ruby/site_ruby/2.6.0/rubygems/source.rb
+ time gem install mina
Fetching mina-1.2.5.gem
Successfully installed mina-1.2.5
1 gem installed
real 0m 1.20s
user 0m 0.47s
sys 0m 0.10s