JRuby 10.1 Released with Ruby 4.0 Compatibility — The first major release of the popular JVM-based Ruby implementation “since catching up with Ruby compatibility” gets Ruby 4.0 compatibility and shifts to a biennial LTS release cycle. There are memory improvements too: every object is 8 bytes smaller, plus tighter numeric representations.

Charles Oliver Nutter

Memetria K/V: Efficient Redis & Valkey Hosting — Memetria K/V hosts Redis OSS and Valkey for Ruby apps, featuring large key tracking and detailed analytics.

Memetria sponsor

A New Chapter for Ruby Central — After a year in post as Executive Director, Shan Cureton has left Ruby Central, along with its CFO, as the organization finds itself in financial jeopardy. When one door closes, another opens, however, and some positive, long-needed changes are coming in and you can get involved.

Jey Flores and Ran Craycraft

ERB Has a Deserialization Vulnerability (CVE-2026-41316) — Any app that calls Marshal.load on untrusted data and has both erb and activesupport loaded is vulnerable to arbitrary code execution. Upgrade your erb gem to version 4.0.3.1, 4.0.4.1, 6.0.1.1, 6.0.4 or later.

Takashi Kokubun

Optimizing Ruby Path Methods — byroot has been speeding up path methods (e.g. File.expand_path), with File.join now faster than string interpolation! A beautifully technical tour through Bootsnap internals, Ruby 4.1’s forthcoming Dir.scan, and why Shift JIS made all of this slower than it needed to be.

Jean Boussier

Selective Test Execution at Stripe: Fast CI for a 50M-Line Ruby Monorepo — How Stripe runs only ~5% of their full 1.2-million-test suite on each build using a variety of techniques like dependecy-graph analysis and heuristics for test selection.

Aditya Anchuri (Stripe)

How a Solo SaaS Founder Stopped Worrying About Rails Maintenance — See how Bonsai helped Tim go from chasing contractors to peace of mind. Hand over the hard tech debt to the experts. 🚀

Bonsai by FastRuby.io® sponsor

mruby 4.0 Released — Built by a team led by Matz himself, mruby is a lightweight, embeddable Ruby implementation for constrained environments. v4.0 focuses on pattern matching support and adds read-only method tables for lower memory use, mirb improvements, and new gems for multitasking, benchmarking, plus a strftime implementation.

The mruby Team

Your Rails App Has an N+1 Problem. AppSignal Will Show You Where — AppSignal auto-detects N+1 queries and leaks. Get Sidekiq, ActionView, Puma metrics. One gem, minutes to monitor. Free 30-day trial, no card.

AppSignal sponsor

Informers 1.3: Run Modern Transformers Models from Ruby — Transformers.rb can run Transformers-compatible models from Ruby, but if a model has an ONNX variant, Informers makes it faster and easier. I’ve been running embedding models in milliseconds with this, but you can also do things like reranking and image classification.

Andrew Kane