<h1><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></h1>
<h2>Introduction</h2>
<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>

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JUnit 6.0.0 was released on September 30, 2025, introducing breaking changes and modernization. The framework now requires Java 17 as the minimum baseline (dropping support for Java 16 and lower) and Kotlin 2.2. Key improvements include unified version numbering across Platform, Jupiter, and Vintage modules, JSpecify nullability annotations for better null safety, and Java Flight Recorder integration in the junit-platform-launcher module. The release removes obsolete APIs while delivering performance enhancements and improved consistency for modern Java development.

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