Versioning support strategy

We decided to restrict our support to the major Fish versions only (currently 3.x and 4.x).

This decision is based on the availability of those versions on LTS Ubuntu thanks to the official PPAs' for Fish 3.x PPA and Fish 4.x as well as on others distributions repositories.

As of October 2026, we are supporting:

• Supporting Fish 4.x and above ;
• Supporting latest 2 versions of major Linux distributions :

Distribution	Version	Supported
Alpine	see docker-fish	✅
Debian	13 Trixie	✅
	12 Bookworm	✅
Enterprise Linux¹	10	✅
	9	✅
Fedora	44	✅
	43	✅
Ubuntu LTS	26.04 Resolute	✅
	24.04 Noble	✅

Distribution	Version	Supported
NixOS	2.35.2 via nixos/nix image	✅
MacOS	latest via Homebrew	✅

• Set the minimal version to 3.6.x as per Debian 12 LTS end-of-life policy.
• Dropping support for 3.3.x

¹ Enterprise Linux includes RHEL, Rocky Linux, AlmaLinux, and CentOS.

Energy footprint

To reduce our energy footprint, we will only test:

• versions available on latest Ubuntu LTS, MacOS and NixOS (see availability) ;
• latest two versions of Fish.