What specific version of the JUnit framework have you used in your projects?

The specific version of JUnit used in projects depends on requirements and environment. The most common versions are JUnit 4 and JUnit 5.

JUnit 4 was widely used for a long time, using annotations like @Test, @Before, @After.

JUnit 5 is more modern, modular, supports new Java features, improved support for parameterized tests, and extensibility.

In my projects, JUnit 5 (for example, versions 5.7 and above) was used more often, as it offers more flexibility and better integrates with modern build tools and CI.