Tailwind CSS 4.3.1

Overview

Tailwind CSS 4.3.1 is a patch release published June 23, 2026, addressing a small set of regression bugs discovered in the v4.3.0 release from May 8, 2026. This release introduces no new features; it focuses on correctness and stability.

Fixed Issues

• Horizontal rule border width — Fixed a bug where <hr> elements were rendered with a 2px border instead of the intended 1px border. This regression affected all projects using the v4.3 upgrade.
• Node.js 26+ compatibility — Added support for the Node.js 26 runtime. Projects running on the latest Node.js LTS line can now use Tailwind CSS without compatibility warnings.
• Deprecation warning cleanup — Removed internal deprecation warnings that were incorrectly surfacing during builds on newer Node.js versions.

Installation

Update via npm, pnpm, or yarn:

npm install tailwindcss@latest

Upgrade Notes

No breaking changes. This release is fully backward-compatible with v4.3.0. Existing projects can update with zero configuration changes.

Acknowledgments

Thanks to the community contributors who identified the horizontal rule regression and submitted patches. Tailwind CSS continues to rely on its open-source community for rapid bug discovery and resolution.