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What are the unified version changes in JUnit 6 and why do they matter for dependency management?

One of the practical improvements in JUnit 6 is the adoption of a single unified version number across all three components. In JUnit 5, the components used different version schemes, causing widespread confusion and dependency conflicts.

JUnit version comparison
ComponentJUnit 5 versionsJUnit 6 versions
JUnit Platform1.0.x through 1.11.x6.0.x through 6.x.x (same as others)
JUnit Jupiter5.0.x through 5.11.x6.0.x through 6.x.x (same as Platform)
JUnit Vintage5.0.x through 5.11.x6.0.x through 6.x.x (same as Platform)
<!-- JUnit 5: confusing mixed versions -->
<!-- Correct combination for JUnit 5.11.4: -->
<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-engine</artifactId>
    <version>1.11.4</version>  <!-- Platform uses 1.x.x -->
</dependency>
<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-api</artifactId>
    <version>5.11.4</version>  <!-- Jupiter uses 5.x.x -->
</dependency>
<!-- Common mistake: using 5.11.4 for Platform (wrong!) -->
<!-- or 1.11.4 for Jupiter (also wrong!) -->

<!-- JUnit 6: all use the same version -->
<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-engine</artifactId>
    <version>6.1.1</version>   <!-- same version -->
</dependency>
<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-api</artifactId>
    <version>6.1.1</version>   <!-- same version -->
</dependency>

<!-- BOM still recommended to avoid managing versions at all -->
<dependency>
    <groupId>org.junit</groupId>
    <artifactId>junit-bom</artifactId>
    <version>6.1.1</version>
    <type>pom</type><scope>import</scope>
</dependency>

What was the version number of JUnit Platform when JUnit Jupiter was at version 5.11.4?
Why does unified versioning in JUnit 6 reduce confusion compared to JUnit 5?

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