k0kubun
@k0kubun.com
Optimizing Ruby JIT. ZJIT team at Shopify.
Ruby 4.0.7 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.7 Released | Ruby
Ruby 4.0.7 has been released.
www.ruby-lang.org
September 15, 2026 at 3:08 AM
Ruby 4.0.7 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Join me at @sfruby.com's Ruby Conference and get your pixel card too 👾 clouds.sfruby.com/e/2026-bits/...
Takashi Kokubun · San Francisco Ruby Conference
Staff Engineer at Shopify. Joining the San Francisco Ruby Conference on November 10-12, 2026.
clouds.sfruby.com
September 14, 2026 at 6:41 PM
Join me at @sfruby.com's Ruby Conference and get your pixel card too 👾 clouds.sfruby.com/e/2026-bits/...
> Message from general-purpose (ctrl+o to expand)
> press ctrl+o
> my launcher opens Slack
> press ctrl+o
> my launcher opens Slack
September 3, 2026 at 5:35 PM
> Message from general-purpose (ctrl+o to expand)
> press ctrl+o
> my launcher opens Slack
> press ctrl+o
> my launcher opens Slack
We'll present a paper about ZJIT at VMIL'26! conf.researchr.org/details/spla...
Support Local Variables (VMIL 2026 - Workshop on Virtual Machines and Language Implementations) - SPLASH/ISSTA 2026
Virtual Machines are pervasive in the design and implementation of programming systems. In fact, languages implemented as virtual machines are crucial in the specification, implementation, and deploym...
conf.researchr.org
August 28, 2026 at 5:06 PM
We'll present a paper about ZJIT at VMIL'26! conf.researchr.org/details/spla...
Reposted by k0kubun
VMIL'26 has a program! Looks very interesting.
Static Analysis, optimizing Android's GC, understanding R's benchmarks, optimizing Ruby, and lots more!
The SPLASH early registration deadline is September 3rd!
Program: conf.researchr.org/home/splash-...
Static Analysis, optimizing Android's GC, understanding R's benchmarks, optimizing Ruby, and lots more!
The SPLASH early registration deadline is September 3rd!
Program: conf.researchr.org/home/splash-...
August 28, 2026 at 11:25 AM
VMIL'26 has a program! Looks very interesting.
Static Analysis, optimizing Android's GC, understanding R's benchmarks, optimizing Ruby, and lots more!
The SPLASH early registration deadline is September 3rd!
Program: conf.researchr.org/home/splash-...
Static Analysis, optimizing Android's GC, understanding R's benchmarks, optimizing Ruby, and lots more!
The SPLASH early registration deadline is September 3rd!
Program: conf.researchr.org/home/splash-...
Reposted by k0kubun
A quick followup on Ruby Hashes byroot.github.io/ruby/perform...
Speeding Up (small) Ruby Hashes
Something I must confess is that I absolutely hate writing these blog posts. It’s not quite as bad as having to give a conference talk, but it’s up there on the list of activities that feel like pulli...
byroot.github.io
August 13, 2026 at 1:08 PM
A quick followup on Ruby Hashes byroot.github.io/ruby/perform...
Ruby 4.0.6 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.6 Released | Ruby
Ruby 4.0.6 has been released.
www.ruby-lang.org
July 14, 2026 at 1:53 AM
Ruby 4.0.6 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
We released Ruby 4.0.5 and published security advisory for CVE-2026-46727.
If you use Ruby 4.0.0~4.0.4, we recommend updating your Ruby version to 4.0.5.
www.ruby-lang.org/en/news/2026...
If you use Ruby 4.0.0~4.0.4, we recommend updating your Ruby version to 4.0.5.
www.ruby-lang.org/en/news/2026...
Ruby 4.0.5 Released | Ruby
Ruby 4.0.5 has been released.
www.ruby-lang.org
May 20, 2026 at 12:39 AM
We released Ruby 4.0.5 and published security advisory for CVE-2026-46727.
If you use Ruby 4.0.0~4.0.4, we recommend updating your Ruby version to 4.0.5.
www.ruby-lang.org/en/news/2026...
If you use Ruby 4.0.0~4.0.4, we recommend updating your Ruby version to 4.0.5.
www.ruby-lang.org/en/news/2026...
Reposted by k0kubun
If you haven't upgraded yet, Ruby 4.0's garbage collection is generally much faster than 3.4. This patch release fixes the one area there had previously been a notable regression (allocating/freeing Classes).
Ruby 4.0.4 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.4 Released | Ruby
Ruby 4.0.4 has been released.
www.ruby-lang.org
May 12, 2026 at 2:56 PM
If you haven't upgraded yet, Ruby 4.0's garbage collection is generally much faster than 3.4. This patch release fixes the one area there had previously been a notable regression (allocating/freeing Classes).
Ruby 4.0.4 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.4 Released | Ruby
Ruby 4.0.4 has been released.
www.ruby-lang.org
May 11, 2026 at 9:49 PM
Ruby 4.0.4 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.3 has been released. It updates ERB to 6.0.1.1 for CVE-2026-41316.
If your application calls Marshal.load on untrusted data AND has both erb and activesupport loaded, please update your ERB version. You may update Ruby to 4.0.3 to do so.
www.ruby-lang.org/en/news/2026...
If your application calls Marshal.load on untrusted data AND has both erb and activesupport loaded, please update your ERB version. You may update Ruby to 4.0.3 to do so.
www.ruby-lang.org/en/news/2026...
Ruby 4.0.3 Released | Ruby
Ruby 4.0.3 has been released.
www.ruby-lang.org
April 21, 2026 at 9:22 AM
Ruby 4.0.3 has been released. It updates ERB to 6.0.1.1 for CVE-2026-41316.
If your application calls Marshal.load on untrusted data AND has both erb and activesupport loaded, please update your ERB version. You may update Ruby to 4.0.3 to do so.
www.ruby-lang.org/en/news/2026...
If your application calls Marshal.load on untrusted data AND has both erb and activesupport loaded, please update your ERB version. You may update Ruby to 4.0.3 to do so.
www.ruby-lang.org/en/news/2026...
Ruby 4.0.2 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes a bugfix in YJIT for NoMethodError on Puma. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes a bugfix in YJIT for NoMethodError on Puma. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.2 Released | Ruby
Ruby 4.0.2 has been released.
www.ruby-lang.org
March 16, 2026 at 11:48 PM
Ruby 4.0.2 Released www.ruby-lang.org/en/news/2026...
This is a routine update that includes a bugfix in YJIT for NoMethodError on Puma. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes a bugfix in YJIT for NoMethodError on Puma. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.1 Released www.ruby-lang.org/en/news/2026...
This release includes a bugfix for Kernel#sleep, along with other bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This release includes a bugfix for Kernel#sleep, along with other bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 4.0.1 Released | Ruby
Ruby 4.0.1 has been released.
www.ruby-lang.org
January 13, 2026 at 4:38 AM
Ruby 4.0.1 Released www.ruby-lang.org/en/news/2026...
This release includes a bugfix for Kernel#sleep, along with other bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
This release includes a bugfix for Kernel#sleep, along with other bugfixes. We recommend upgrading your Ruby version at your earliest convenience.
Reposted by k0kubun
@k0kubun.com talked about ZJIT, the next generation of YJIT for Ruby 3.5. He explained how to use it to improve Ruby’s speed in Ruby and Rails infrastructures.
Takashi Kokubun, ZJIT: The future of Ruby performance. San Francisco Ruby Conference 2025.
YouTube video by Evil Martians
youtu.be
December 29, 2025 at 7:09 PM
@k0kubun.com talked about ZJIT, the next generation of YJIT for Ruby 3.5. He explained how to use it to improve Ruby’s speed in Ruby and Rails infrastructures.
Ruby 3.4.8 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 3.4.8 Released
www.ruby-lang.org
December 17, 2025 at 12:53 AM
Ruby 3.4.8 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
Happy 10th anniversary to md2key
October 28, 2025 at 5:56 AM
Happy 10th anniversary to md2key
Reposted by k0kubun
Today is the last day to grab a GA ticket for SF Ruby! Read our new blog post for a preview: evilmartians.com/chronicles/w...
Why we're excited about the SF Ruby conference—Martian Chronicles, Evil Martians’ team blog
SF Ruby and Evil Martians are excited to invite you to our premier event: the San Francisco Ruby Conference.
evilmartians.com
October 22, 2025 at 7:13 PM
Today is the last day to grab a GA ticket for SF Ruby! Read our new blog post for a preview: evilmartians.com/chronicles/w...
October 21, 2025 at 10:58 PM
Reposted by k0kubun
I tried to explain why I don't believe the recent accusations toward my former teammates, as well as how the Ruby and Rails Infra team at Shopify operates and why it can be trusted.
byroot.github.io/opensource/r...
byroot.github.io/opensource/r...
Dear Rubyists: Shopify Isn’t Your Enemy
I’ve been meaning to write a post about my perspective on Open Source and corporate entities. I already got the rough outline of it; however, I’m suffering from writer’s block, but more importantly, t...
byroot.github.io
October 9, 2025 at 2:15 PM
I tried to explain why I don't believe the recent accusations toward my former teammates, as well as how the Ruby and Rails Infra team at Shopify operates and why it can be trusted.
byroot.github.io/opensource/r...
byroot.github.io/opensource/r...
Ruby 3.4.7 Released ruby-lang.org/en/news/2025...
This release contains a uri gem update for CVE-2025-61594, along with other bug fixes.
We recommend updating your uri gem version. This release has been made for the convenience of those who wish to continue using it as a default gem.
This release contains a uri gem update for CVE-2025-61594, along with other bug fixes.
We recommend updating your uri gem version. This release has been made for the convenience of those who wish to continue using it as a default gem.
Ruby 3.4.7 Released
ruby-lang.org
October 7, 2025 at 9:41 PM
Ruby 3.4.7 Released ruby-lang.org/en/news/2025...
This release contains a uri gem update for CVE-2025-61594, along with other bug fixes.
We recommend updating your uri gem version. This release has been made for the convenience of those who wish to continue using it as a default gem.
This release contains a uri gem update for CVE-2025-61594, along with other bug fixes.
We recommend updating your uri gem version. This release has been made for the convenience of those who wish to continue using it as a default gem.
Ruby 3.4.6 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 3.4.6 Released
www.ruby-lang.org
September 16, 2025 at 12:11 AM
Ruby 3.4.6 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 3.4.5 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes and GCC 15 support. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes and GCC 15 support. We recommend upgrading your Ruby version at your earliest convenience.
Ruby 3.4.5 Released
www.ruby-lang.org
July 15, 2025 at 5:25 PM
Ruby 3.4.5 Released www.ruby-lang.org/en/news/2025...
This is a routine update that includes bug fixes and GCC 15 support. We recommend upgrading your Ruby version at your earliest convenience.
This is a routine update that includes bug fixes and GCC 15 support. We recommend upgrading your Ruby version at your earliest convenience.
Reposted by k0kubun
years after working with a team that was vehemently against deleting any test, no matter how flaky, I have assembled my counter-doctrine: you should delete tests
andre.arko.net/2025/06/30/y...
andre.arko.net/2025/06/30/y...
You should delete tests
We’ve had decades of thought leadership around testing, especially coming from wholistic development philosophies like Agile, TDD, and BDD. After all that time and several supposedly superseding movem...
andre.arko.net
July 1, 2025 at 7:20 PM
years after working with a team that was vehemently against deleting any test, no matter how flaky, I have assembled my counter-doctrine: you should delete tests
andre.arko.net/2025/06/30/y...
andre.arko.net/2025/06/30/y...
Ruby 3.4.4 Released www.ruby-lang.org/en/news/2025...
This release includes a fix for a YJIT bug related to local variables and addresses a build issue on Windows when using GCC 15. It was released ahead of schedule to make these fixes available as soon as possible.
This release includes a fix for a YJIT bug related to local variables and addresses a build issue on Windows when using GCC 15. It was released ahead of schedule to make these fixes available as soon as possible.
Ruby 3.4.4 Released
www.ruby-lang.org
May 14, 2025 at 6:48 PM
Ruby 3.4.4 Released www.ruby-lang.org/en/news/2025...
This release includes a fix for a YJIT bug related to local variables and addresses a build issue on Windows when using GCC 15. It was released ahead of schedule to make these fixes available as soon as possible.
This release includes a fix for a YJIT bug related to local variables and addresses a build issue on Windows when using GCC 15. It was released ahead of schedule to make these fixes available as soon as possible.