<p><a href="https://www.rafaelvieiradev.com.br/en/blog/junit-600-whats-new-why-migrate-and-how-to-use" target="_blank" rel="noopener nofollow">JUnit 6.0.0 — What’s New, Why Migrate, and How to Use</a></p>
<p>The JUnit testing framework has been the primary unit testing tool in the Java ecosystem for many years. The previous major version, JUnit 5 (Jupiter/Platform), brought significant modernization. Now, with the arrival of version 6.0.0, we have a new stage of evolution — not just continuity, but with important changes for the modern Java developer. Below we explore what has changed, why it’s worth migrating, and how to make good use of the new features.</p>
<p>Version Overview
Version 6.0.0 was released on September 30, 2025.</p>
<h3>Some highlights of this version:</h3>
<p>The minimum Java baseline is now Java 17 (or higher) – Java 16 or lower are no longer supported.
The minimum Kotlin baseline is now Kotlin 2.2.
A single version numbering for Platform, Jupiter, and Vintage modules (there were previously discrepancies).
Use of JSpecify nullability annotations to indicate parameters/returns that accept or don’t accept null.
Integration of Java Flight Recorder (JFR) functionality in the junit-platform-launcher module.
Many obsolete APIs removed and improvements in performance, usability, and consistency.
In summary: if you’re developing in modern Java (17+), want to take advantage of better testing APIs, parallel execution, deterministic ordering, etc., JUnit 6 brings a very attractive package.</p>


Rafael Vieira

JUnit 6.0.0 was released on September 30, 2025, requiring Java 17+ and Kotlin 2.2+ as minimum baselines. Key changes include unified version numbering across Platform, Jupiter, and Vintage modules, JSpecify nullability annotations, Java Flight Recorder integration in the launcher module, and removal of obsolete APIs. The update focuses on performance improvements, better usability, and consistency for modern Java development with enhanced parallel execution and deterministic ordering capabilities.

JUnit 6.0.0 — What's New, Why Migrate, and How to Use