4.1

open

Due in about 6 months (12/25/2026)

70%

Related issues
		Bug #21612: Make sure we never context switch while holding the VM lock	Actions
		Bug #21783: {Method,UnboundMethod,Proc}#source_location returns columns in bytes and not in characters	Actions
		Bug #21784: Proc#source_location start column seems strange for -> {}	Actions
		Bug #21840: Locking a mutex can lead to starvation	Actions
		Bug #21866: Backport Fix for integer overflow checks in enumerator	Actions
		Bug #21925: Prism misparses standalone "in" pattern matching in "case/in"	Actions
		Bug #22096: Freeing a mutex locked by a fiber inside fiber scheduler can crash	Actions
		Bug #22116: Segfault with YJIT when `define_method` + `super()` calls a method that creates a `Hash.new { ... }`	Actions
		Bug #22117: Segfault with YJIT when `define_method` + `super()` calls a method that creates a `Hash.new { ... }`	Actions
		Bug #22120: Segfault caused by ar_find_entry_hint() not checking for conversion to st_table	Actions
		Feature #8948: Frozen regex	Actions
		Feature #21768: Remove deprecated functions	Actions
		Feature #21788: Promote Thread::Monitor to a core class	Actions
		Feature #21821: Add Stack and SizedStack classes	Actions
		Feature #21881: Split the root box into the (newer) root box and the master of copied user boxes	Actions
		Feature #22010: Update to Unicode 18.0	Actions
		Feature #22081: Core type definition migration from `ruby/rbs` to `ruby/ruby`	Actions

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Ruby