Ruby Core Updates

Daily updates from the Ruby programming language core. Track the evolution of Ruby with insights into new features, optimizations, and language improvements.

About this developer podcast

Ruby Core Updates turns GitHub activity into short audio updates.

Episodes cover commits, pull requests, issues, and release work.

Use this page to listen, subscribe, and find related developer podcasts.

This show page is the public hub for the podcast. It has one stable listen URL.

Use it to find RSS feeds, recent episodes, related shows, and older episode links.

If the project is quiet, new episodes may pause until there is useful activity to summarize.

Recent episodes from Ruby Core Updates

  1. Fork Safety, GC Barriers and Stable Fixes

    Forking while background hostname lookups run could hang or crash child processes, prompting two reliability fixes now backported to stable Ruby. The rest of the activity centers on garbage-collector memory safety and small correctness…

  2. Fork Lock Fix, Array Corrections, and GC Tuning

    Thread and process reliability leads the week with fixes for a macOS fork child crash and lost interrupt state, paired with Array correctness and speed fixes and ongoing garbage collector and YJIT work.

  3. Fork Hang Fix, Windows Parallel Builds and ZJIT Budgeting

    Ruby fixes a forking DNS hang flagged for backport to 3.4 and 4.0, overhauls Windows builds with parallel GNU make and clang-cl support, and gives ZJIT a compile-time budget. The pattern is production reliability: safer forks, faster…

  4. JIT Reliability and Fork Safety

    ZJIT correctness and startup fixes lead a reliability-heavy cycle, alongside a critical fix for forking during DNS lookups hanging the child. Ractor, autoload, and core library polish round out developer-facing impact.

  5. Breaking the Two Gigabyte Limit on Windows

    The dominant theme is lifting Ruby's 2-gigabyte string and array limit on 64-bit Windows, an ABI-breaking change paired with parser, regexp, and core overflow fixes. A second push targets everyday performance for floats, case-insensitive…

  6. Weekly Recap - Length Types, Windows Y-JIT, and Built-in Prism

    Ruby core pushed large-object readiness with a new length type across core, default gems and JIT compilers, alongside first Y-JIT support on Windows. The week also folded Prism into the interpreter and retired obsolete Apple targets…

  7. 64-Bit Length Hardening and Regexp Stability

    Core work converged on fixing 32-bit length and index assumptions ahead of a wider length type on Windows, alongside Regexp reliability backports to Ruby 3.4. Numeric sort speedups, clearer DNS errors, and new Haiku CI round out the day.

  8. Prism Built In, Length Safety, and IO Reliability

    Prism is now built into the interpreter as Ruby Prism with the prism gem becoming bundled, while C extensions migrate to the core length type and IO gains crash and timeout fixes. The pattern is structural hardening: core parser…

  9. Length Type Migration and Refinement Super Fix
  10. New Length Type and JIT Performance Push
  11. Crash Hardening and Legacy Mac Cleanup
  12. YJIT Lands on Windows
  13. Linear Compiles, Faster Windows Builds, and Clearer GC Stats
  14. Weekly Recap - JIT Hardening, Legacy Cleanup, and Crash Diagnostics
  15. Windows Reliability and Eval Fork Fixes
  16. Test Stability, Windows Builds, and Runtime Safety
  17. Runtime Hardening and Legacy Platform Cleanup
  18. Legacy Cleanup, JIT Tuning, and Buffer Work
  19. Windows Reliability and GC Safety Push
  20. JIT Speed Push and Crash Dump Overhaul
  21. Windows Reliability Push and Ractor GC Fixes
  22. Weekly Recap - Crash Hardening, ZJIT Efficiency, and Windows Cleanup
  23. I-O Buffer Safety Overhaul and Array Crash Fixes
  24. Windows Reliability Sweep and ZJIT Speedups
  25. IO Reliability Fixes, ZJIT Speedups, and Platform Hardening
  26. Crash Fixes, Regexp Hangs, and JIT Controls
  27. ZJIT Specialization Push and Memory Safety Fixes
  28. ZJIT Speed Push and Memory Safety Fixes
  29. Mutation Crashes, Relocatable Builds and ZJIT Leak Fix
  30. Weekly Recap - Memory Safety Hardening, ZJIT and Ractor Stability
  31. Mutation-Driven Crashes Fixed
  32. String Safety Fixes and Faster Keywords
  33. Use-After-Free Fixes and Ractor GC Concurrency
  34. A Week of Memory-Safety Fixes
  35. A Week of Memory Safety Fixes
  36. A Week of Use-After-Free Fixes
  37. TCP Socket Hardening and Memory Safety Sweep
  38. Weekly Recap - Coroutine Hardening & Ractor Cleanup
  39. Concurrency Rework and Compiler Speedups
  40. Set-Based Speedups and Windows Reliability
  41. ZJIT Optimization Push and Cross-Platform Reliability Fixes
  42. ZJIT Pushes Deeper, Cleanup Season Continues
  43. Ractor Ownership Overhaul
  44. Ractor Hardening and the Box Experiment Push
  45. Buffer Overruns and Boundary Bugs
  46. Weekly Recap - Box Isolation Fixes and ZJIT's Steady March
  47. Box Isolation's Rough Edges
  48. Stale Caches and Broken Invariants
  49. Trimming Memory Overhead Across the VM
  50. JIT Performance and Windows Build Fixes
  51. Windows Networking Gets Serious Attention
  52. Correctness Fixes and Post-Quantum Signing Lands in RubyGems
  53. JIT Memory and Performance Tuning
  54. Weekly Recap - Memory Trimming and the Box Model Hardens
  55. Ruby Box Hardening Push
  56. JIT Tuning and a Security Backport
  57. Scheduler Unification and Interpreter Slimming
  58. Concurrency Fixes and a Security Backport
  59. Box Isolation Under Fire, ZJIT Correctness Hardening
  60. Shrinking the Hash
  61. IO::Buffer Hardening and Memory Trimming
  62. Weekly Recap - Concurrency Hardening & Memory Trimming
  63. I O Buffer Hardening and Memory Trimming
  64. Threading Scheduler Overhaul and Race Fixes
  65. Buffer Safety and Method Cache Fixes
  66. Trimming Memory and Fixing the Coverage Tax
  67. Ractor Memory Leaks Get Squashed
  68. ZJIT Catches Up, Windows Paths Get Fixed for Real
  69. ZJIT Momentum and Marshal Hardening
  70. Weekly Recap - Concurrency Hardening and ZJIT Performance Gains
  71. M:N Threading Gets a Concurrency Overhaul
  72. Ractor Shutdown Race Fixed
  73. The M:N Scheduler Gets Hardened
  74. JIT Correctness and Garbage Collector Tuning
  75. JIT Compiler Cleanup and Garbage Collector Tuning
  76. Concurrency Lock Ordering and GC Precision
  77. Ractor Memory Cleanup and ZJIT Register Work
  78. Weekly Recap - Ractors Get Their Own Garbage Collector
  79. Garbage Collector Gets a Deep Audit
  80. Garbage Collector Gets a Closer Look
  81. The Great Ractor GC Cleanup
  82. Ractors, GC, and a Wobbly Object ID Fix
  83. Object Identity Bugs and Backtrace Accuracy
  84. Ractor Object Move Safety and JIT Precision
  85. Ractors Get Faster, and Concurrency Bugs Get Quieter
  86. Weekly Recap - Ractor Safety and ZJIT Performance Push
  87. Correctness Fixes Under Concurrency and GC
  88. Trimming Memory, One Byte at a Time
  89. ZJIT Optimizer Trims the Fat
  90. ZJIT Hardening and CI Firefighting
  91. ZJIT Cleanup and Correctness Fixes
  92. Ractors Expose Cross-Thread Race Conditions
  93. JIT Precision and Documentation Cleanup
  94. Weekly Recap - ZJIT Performance Push and a Documentation Overhaul
  95. The Great Documentation Correction
  96. Garbage Collector Cleanup and Build Chain Fixes
  97. JIT Correctness and a Same-Day Revert
  98. ZJIT's Speed Push and a Windows Cleanup Wave
  99. Memory Safety Sweep
  100. Paths, Quotes, and Longjmp Landmines

Episode archive for Ruby Core Updates

  1. Boot Time and the Struct Layout Trade-off
  2. Weekly Recap - JIT Maturity and Memory Safety
  3. Correctness Fixes Take Center Stage
  4. Edge Case Cleanup Across the Interpreter
  5. Fiber Safety and Runtime Introspection
  6. JIT Stability and the Longjmp Problem
  7. Concurrency Bugs and JIT Speedups
  8. Object Layout Cleanup and Concurrency Hardening
  9. Object Layout Overhaul and ZJIT's Inlining Push
  10. Weekly Recap - Concurrency Hardening and ZJIT Performance Push
  11. Windows Build Cleanup and CI Stability
  12. Windows CI Overhaul and Memory Safety Fixes
  13. Ractor Barrier Race Fixes and JIT Specialization Push
  14. ZJIT Performance Push and Threading Safety Fixes
  15. Threading Teardown Overhaul and ZJIT Speed Gains
  16. Garbage Collector and JIT Get a Tune-Up
  17. Memory Layout and JIT Performance Push
  18. Weekly Recap - Memory Layout and Ractor Hardening
  19. Regexp Memory Overhaul and GC Correctness Sweep
  20. Packaging and Platform Fixes Take Center Stage
  21. Ractor Safety and GC Internals Get a Hard Look
  22. Ractor Isolation Hardening
  23. Weekly Recap - JIT Performance and Memory Management
  24. Performance Optimizations and CI Infrastructure Fixes
  25. Syntax Evolution and Runtime Stability
  26. ZJIT Performance Infrastructure and Compiler Optimizations
  27. Performance Optimizations and Memory Safety Fixes
  28. Memory Safety and JIT Optimizations
  29. ZJIT Optimization and Security Hardening
  30. Security Hardening and Performance Optimization
  31. Weekly Recap - JIT Performance and Memory Management
  32. RubyGems Security and Documentation Polish
  33. Documentation Push and Runtime Improvements
  34. ZJIT Performance and Memory Safety Improvements
  35. Memory Safety and Performance Focus
  36. ZJIT Optimizations and Memory Management
  37. ZJIT Optimization Push and Documentation Improvements
  38. Performance Optimizations and Infrastructure Improvements
  39. Weekly Recap - JIT Optimization and Core Infrastructure
  40. Garbage Collection Optimizations
  41. JIT Optimization and Object Layout Changes
  42. JIT Optimizations and Marshal Security Fixes
  43. ZJIT Refactoring and Code Cleanup
  44. String Performance and Security Fixes
  45. CI Optimization and Documentation Improvements
  46. Documentation Fixes and Memory Management Improvements
  47. Weekly Recap - ZJIT Optimization & Performance Improvements
  48. ZJIT Improvements and String Performance
  49. JIT Compiler Fixes and GC Improvements
  50. CI Workflow Cleanup and Memory Management
  51. Refinement Fixes and CI Improvements
  52. Security Fixes and Testing Infrastructure Overhaul
  53. Memory Safety and Performance Optimizations
  54. Refinement Fixes and Documentation Improvements
  55. Weekly Recap - Refinements & Infrastructure Improvements
  56. ZJIT Optimizations and Bug Fixes
  57. Memory Optimization and Security Fixes
  58. JIT Improvements and Class System Refactoring
  59. ZJIT Optimizations and Bug Fixes
  60. Regexp Validation and GC Improvements
  61. String Methods and Scheduler Fixes
  62. Box Architecture Overhaul and Fiber Scheduler Fix
  63. Performance Optimizations and ZJIT Improvements
  64. Exception Handling and ZJIT Performance Fixes
  65. Refinement Fixes and Documentation Improvements
  66. Shape System Optimization and Documentation Improvements
  67. Performance and Memory Management Improvements
  68. Coverage Module and GC Improvements
  69. Weekly Recap - Shape System Optimization & Memory Performance
  70. Shape System Optimization and Documentation Improvements
  71. Shape System Optimization
  72. ZJIT Performance Enhancements and Global Variable Fixes
  73. Memory Management and Documentation Improvements
  74. JIT Optimizations and String Instruction Refactoring
  75. Garbage Collection Cleanup and ZJIT Optimization
  76. Garbage Collection API Refinements
  77. Weekly Recap - Memory Safety & Performance Enhancements
  78. Memory Safety and Write Barrier Fixes
  79. Array Method Documentation Clarification
  80. API Exposure and RubyGems Security Enhancements
  81. ZJIT Refactoring and Library Fixes
  82. C23 Compatibility and ERB Sync
  83. Memory Management and Performance Optimizations
  84. Weekly Recap - Dependency Management & Performance
  85. Weekly Recap - Performance Optimizations & Bug Fixes
  86. Development Tool Reliability Fix
  87. Weekly Recap - ZJIT Performance and Infrastructure Improvements
  88. ZJIT Performance Optimizations
  89. JIT Compiler Optimizations and Bug Fixes
  90. Ractor Fixes and JIT Improvements
  91. Memory Management and JIT Improvements
  92. ZJIT Performance Improvements and GC Optimizations
  93. CI Infrastructure Improvements
  94. Weekly Recap - ZJIT Performance & Core Infrastructure
  95. ZJIT Optimization and Developer Tools
  96. ZJIT Performance Optimizations and Source Location Revert
  97. ZJIT Performance Improvements and CI Stability Fixes
  98. ZJIT Optimization and Performance Improvements
  99. ZJIT Performance Enhancements and Regexp Freezing
  100. ZJIT Compilation Improvements and Bug Fixes
  101. Documentation Improvements and Bundler Restructuring
  102. Weekly Recap - JIT Optimization & Performance Enhancement
  103. ZJIT Array Access Optimization
  104. ZJIT Performance Improvements and Prism Parser Updates
  105. ZJIT TracePoint and Subclass Improvements
  106. ZJIT Performance and Security Fixes
  107. JIT Compiler Fixes and VM Optimizations
  108. Weekly Recap - ZJIT Optimization & Parser Modernization
  109. Parser Transition and Performance Improvements
  110. ZJIT Optimizations and Prism Compiler Improvements
  111. Threading and RubyGems Compatibility Fixes
  112. ZJIT Optimization and Core Fixes
  113. ZJIT Optimizations and Zlib Updates
  114. Threading Fixes and Memory Optimization
  115. Weekly Recap - JIT Optimizations and Bug Fixes
  116. JSON Gem Security and Release Update
  117. ZJIT Performance Enhancements and Bug Fixes
  118. ZJIT Optimizations and Prism Parser Improvements
  119. ZJIT Optimization and WeakMap Bug Fix
  120. JIT Improvements and New ENV Method
  121. ZJIT Performance Optimizations
  122. Parser Refactoring and Lrama 0.8.0
  123. GitHub Actions Security Hardening
  124. ZJIT Optimizations and Error Handling
  125. Memory Management and Parser Enhancements
  126. ZJIT Improvements and Documentation Fixes
  127. YJIT Memory Safety and GC Improvements
  128. Prism Integration and Performance Enhancements
  129. Major Performance and API Enhancements
  130. ZJIT Performance Improvements and Method Equality Fix
  131. Documentation Fixes and JSON Performance Improvements
  132. Test Reliability and Performance Fixes
  133. Test Stability and Documentation Improvements
  134. ZJIT Performance Enhancements and GC Improvements
  135. Segfault Fix and Performance Improvements
  136. ZJIT Performance and Documentation Updates
  137. ZJIT Performance Improvements and Documentation Updates
  138. ZJIT Compiler Enhancements and Core Bug Fixes
  139. ZJIT Performance Improvements and File Optimization
  140. Performance Optimizations and JIT Improvements
  141. ZJIT Optimizations and Core Stability Fixes
  142. Week of January 06 - January 13, 2026
  143. January 12, 2026
  144. January 11, 2026
  145. January 10, 2026
  146. January 09, 2026
  147. January 08, 2026
  148. January 07, 2026
  149. January 06, 2026

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