Ruby's Bundler 4.0.18 Extends Cooldown to bundle lock and bundle cache

Bundler 4.0.18 adds the opt-in --cooldown flag to bundle lock and bundle cache, closing gaps where the setting could not be applied. Bundler 4.0.18, released August 5, 2026 alongside RubyGems 4.0.18, extends the cooldown feature to two more commands. The opt-in --cooldown flag now works with bundle lock and bundle cache, which previously resolved dependencies without accepting the flag. RubyGems lists the change under Bundler security in the release notes. The cooldown feature is not new. It…