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. JIT Performance and Windows Build Fixes

    The ZJIT and YJIT compilers picked up several performance and correctness improvements, while a cluster of Windows-specific build and test fixes landed from hsbt. Together they show ongoing work to tighten JIT code generation and make…

  2. Windows Networking Gets Serious Attention

    A cluster of Windows-specific socket fixes landed alongside continued ZJIT compiler work, while RubyGems saw a string of hardening fixes to its compact index fetch path. Together they point to a focus on platform correctness and…

  3. Correctness Fixes and Post-Quantum Signing Lands in RubyGems

    Today's activity centers on a wave of low-level correctness fixes across the parser, JIT, and memory management, plus the arrival of full post-quantum ML-DSA signing support in RubyGems. Several changes trim wasted resources at…

  4. JIT Memory and Performance Tuning

    A cluster of changes across ZJIT and YJIT focused on memory efficiency and profile-guided optimization, alongside documentation cleanup and box-related bug fixes. The standout theme: multiple engineers independently found and fixed…

  5. Weekly Recap - Memory Trimming and the Box Model Hardens

    This week's work centered on shrinking core object memory footprints and closing correctness gaps in the experimental Ruby Box isolation feature, alongside continued ZJIT compiler refinement and a coordinated security backport across…

  6. Ruby Box Hardening Push

    A cluster of fixes is closing out correctness gaps in Ruby's experimental Box isolation feature, covering global variables, extension loading, and method dispatch, while a separate memory-safety fix landed in String#encode.

  7. JIT Tuning and a Security Backport

    Ruby's Just-In-Time compiler work dominates today's activity, with Max Bernstein and collaborators landing a string of small speed and tracing improvements, while a security backport to Ruby 3.4's resolver and a scheduler optimization…

  8. Scheduler Unification and Interpreter Slimming

    Ruby's thread and Ractor scheduler is now shared between POSIX and Windows, giving Windows real parallel Ractor execution, while three separate PRs continue trimming memory out of the iseq structure. Several smaller correctness fixes…

  9. Concurrency Fixes and a Security Backport
  10. Box Isolation Under Fire, ZJIT Correctness Hardening
  11. Shrinking the Hash
  12. IO::Buffer Hardening and Memory Trimming
  13. Weekly Recap - Concurrency Hardening & Memory Trimming
  14. I O Buffer Hardening and Memory Trimming
  15. Threading Scheduler Overhaul and Race Fixes
  16. Buffer Safety and Method Cache Fixes
  17. Trimming Memory and Fixing the Coverage Tax
  18. Ractor Memory Leaks Get Squashed
  19. ZJIT Catches Up, Windows Paths Get Fixed for Real
  20. ZJIT Momentum and Marshal Hardening
  21. Weekly Recap - Concurrency Hardening and ZJIT Performance Gains
  22. M:N Threading Gets a Concurrency Overhaul
  23. Ractor Shutdown Race Fixed
  24. The M:N Scheduler Gets Hardened
  25. JIT Correctness and Garbage Collector Tuning
  26. JIT Compiler Cleanup and Garbage Collector Tuning
  27. Concurrency Lock Ordering and GC Precision
  28. Ractor Memory Cleanup and ZJIT Register Work
  29. Weekly Recap - Ractors Get Their Own Garbage Collector
  30. Garbage Collector Gets a Deep Audit
  31. Garbage Collector Gets a Closer Look
  32. The Great Ractor GC Cleanup
  33. Ractors, GC, and a Wobbly Object ID Fix
  34. Object Identity Bugs and Backtrace Accuracy
  35. Ractor Object Move Safety and JIT Precision
  36. Ractors Get Faster, and Concurrency Bugs Get Quieter
  37. Weekly Recap - Ractor Safety and ZJIT Performance Push
  38. Correctness Fixes Under Concurrency and GC
  39. Trimming Memory, One Byte at a Time
  40. ZJIT Optimizer Trims the Fat
  41. ZJIT Hardening and CI Firefighting
  42. ZJIT Cleanup and Correctness Fixes
  43. Ractors Expose Cross-Thread Race Conditions
  44. JIT Precision and Documentation Cleanup
  45. Weekly Recap - ZJIT Performance Push and a Documentation Overhaul
  46. The Great Documentation Correction
  47. Garbage Collector Cleanup and Build Chain Fixes
  48. JIT Correctness and a Same-Day Revert
  49. ZJIT's Speed Push and a Windows Cleanup Wave
  50. Memory Safety Sweep
  51. Paths, Quotes, and Longjmp Landmines
  52. Boot Time and the Struct Layout Trade-off
  53. Weekly Recap - JIT Maturity and Memory Safety
  54. Correctness Fixes Take Center Stage
  55. Edge Case Cleanup Across the Interpreter
  56. Fiber Safety and Runtime Introspection
  57. JIT Stability and the Longjmp Problem
  58. Concurrency Bugs and JIT Speedups
  59. Object Layout Cleanup and Concurrency Hardening
  60. Object Layout Overhaul and ZJIT's Inlining Push
  61. Weekly Recap - Concurrency Hardening and ZJIT Performance Push
  62. Windows Build Cleanup and CI Stability
  63. Windows CI Overhaul and Memory Safety Fixes
  64. Ractor Barrier Race Fixes and JIT Specialization Push
  65. ZJIT Performance Push and Threading Safety Fixes
  66. Threading Teardown Overhaul and ZJIT Speed Gains
  67. Garbage Collector and JIT Get a Tune-Up
  68. Memory Layout and JIT Performance Push
  69. Weekly Recap - Memory Layout and Ractor Hardening
  70. Regexp Memory Overhaul and GC Correctness Sweep
  71. Packaging and Platform Fixes Take Center Stage
  72. Ractor Safety and GC Internals Get a Hard Look
  73. Ractor Isolation Hardening
  74. Weekly Recap - JIT Performance and Memory Management
  75. Performance Optimizations and CI Infrastructure Fixes
  76. Syntax Evolution and Runtime Stability
  77. ZJIT Performance Infrastructure and Compiler Optimizations
  78. Performance Optimizations and Memory Safety Fixes
  79. Memory Safety and JIT Optimizations
  80. ZJIT Optimization and Security Hardening
  81. Security Hardening and Performance Optimization
  82. Weekly Recap - JIT Performance and Memory Management
  83. RubyGems Security and Documentation Polish
  84. Documentation Push and Runtime Improvements
  85. ZJIT Performance and Memory Safety Improvements
  86. Memory Safety and Performance Focus
  87. ZJIT Optimizations and Memory Management
  88. ZJIT Optimization Push and Documentation Improvements
  89. Performance Optimizations and Infrastructure Improvements
  90. Weekly Recap - JIT Optimization and Core Infrastructure
  91. Garbage Collection Optimizations
  92. JIT Optimization and Object Layout Changes
  93. JIT Optimizations and Marshal Security Fixes
  94. ZJIT Refactoring and Code Cleanup
  95. String Performance and Security Fixes
  96. CI Optimization and Documentation Improvements
  97. Documentation Fixes and Memory Management Improvements
  98. Weekly Recap - ZJIT Optimization & Performance Improvements
  99. ZJIT Improvements and String Performance
  100. JIT Compiler Fixes and GC Improvements

Episode archive for Ruby Core Updates

  1. CI Workflow Cleanup and Memory Management
  2. Refinement Fixes and CI Improvements
  3. Security Fixes and Testing Infrastructure Overhaul
  4. Memory Safety and Performance Optimizations
  5. Refinement Fixes and Documentation Improvements
  6. Weekly Recap - Refinements & Infrastructure Improvements
  7. ZJIT Optimizations and Bug Fixes
  8. Memory Optimization and Security Fixes
  9. JIT Improvements and Class System Refactoring
  10. ZJIT Optimizations and Bug Fixes
  11. Regexp Validation and GC Improvements
  12. String Methods and Scheduler Fixes
  13. Box Architecture Overhaul and Fiber Scheduler Fix
  14. Performance Optimizations and ZJIT Improvements
  15. Exception Handling and ZJIT Performance Fixes
  16. Refinement Fixes and Documentation Improvements
  17. Shape System Optimization and Documentation Improvements
  18. Performance and Memory Management Improvements
  19. Coverage Module and GC Improvements
  20. Weekly Recap - Shape System Optimization & Memory Performance
  21. Shape System Optimization and Documentation Improvements
  22. Shape System Optimization
  23. ZJIT Performance Enhancements and Global Variable Fixes
  24. Memory Management and Documentation Improvements
  25. JIT Optimizations and String Instruction Refactoring
  26. Garbage Collection Cleanup and ZJIT Optimization
  27. Garbage Collection API Refinements
  28. Weekly Recap - Memory Safety & Performance Enhancements
  29. Memory Safety and Write Barrier Fixes
  30. Array Method Documentation Clarification
  31. API Exposure and RubyGems Security Enhancements
  32. ZJIT Refactoring and Library Fixes
  33. C23 Compatibility and ERB Sync
  34. Memory Management and Performance Optimizations
  35. Weekly Recap - Dependency Management & Performance
  36. Weekly Recap - Performance Optimizations & Bug Fixes
  37. Development Tool Reliability Fix
  38. Weekly Recap - ZJIT Performance and Infrastructure Improvements
  39. ZJIT Performance Optimizations
  40. JIT Compiler Optimizations and Bug Fixes
  41. Ractor Fixes and JIT Improvements
  42. Memory Management and JIT Improvements
  43. ZJIT Performance Improvements and GC Optimizations
  44. CI Infrastructure Improvements
  45. Weekly Recap - ZJIT Performance & Core Infrastructure
  46. ZJIT Optimization and Developer Tools
  47. ZJIT Performance Optimizations and Source Location Revert
  48. ZJIT Performance Improvements and CI Stability Fixes
  49. ZJIT Optimization and Performance Improvements
  50. ZJIT Performance Enhancements and Regexp Freezing
  51. ZJIT Compilation Improvements and Bug Fixes
  52. Documentation Improvements and Bundler Restructuring
  53. Weekly Recap - JIT Optimization & Performance Enhancement
  54. ZJIT Array Access Optimization
  55. ZJIT Performance Improvements and Prism Parser Updates
  56. ZJIT TracePoint and Subclass Improvements
  57. ZJIT Performance and Security Fixes
  58. JIT Compiler Fixes and VM Optimizations
  59. Weekly Recap - ZJIT Optimization & Parser Modernization
  60. Parser Transition and Performance Improvements
  61. ZJIT Optimizations and Prism Compiler Improvements
  62. Threading and RubyGems Compatibility Fixes
  63. ZJIT Optimization and Core Fixes
  64. ZJIT Optimizations and Zlib Updates
  65. Threading Fixes and Memory Optimization
  66. Weekly Recap - JIT Optimizations and Bug Fixes
  67. JSON Gem Security and Release Update
  68. ZJIT Performance Enhancements and Bug Fixes
  69. ZJIT Optimizations and Prism Parser Improvements
  70. ZJIT Optimization and WeakMap Bug Fix
  71. JIT Improvements and New ENV Method
  72. ZJIT Performance Optimizations
  73. Parser Refactoring and Lrama 0.8.0
  74. GitHub Actions Security Hardening
  75. ZJIT Optimizations and Error Handling
  76. Memory Management and Parser Enhancements
  77. ZJIT Improvements and Documentation Fixes
  78. YJIT Memory Safety and GC Improvements
  79. Prism Integration and Performance Enhancements
  80. Major Performance and API Enhancements
  81. ZJIT Performance Improvements and Method Equality Fix
  82. Documentation Fixes and JSON Performance Improvements
  83. Test Reliability and Performance Fixes
  84. Test Stability and Documentation Improvements
  85. ZJIT Performance Enhancements and GC Improvements
  86. Segfault Fix and Performance Improvements
  87. ZJIT Performance and Documentation Updates
  88. ZJIT Performance Improvements and Documentation Updates
  89. ZJIT Compiler Enhancements and Core Bug Fixes
  90. ZJIT Performance Improvements and File Optimization
  91. Performance Optimizations and JIT Improvements
  92. ZJIT Optimizations and Core Stability Fixes
  93. Week of January 06 - January 13, 2026
  94. January 12, 2026
  95. January 11, 2026
  96. January 10, 2026
  97. January 09, 2026
  98. January 08, 2026
  99. January 07, 2026
  100. January 06, 2026

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