RedLine13 supports Apache JMeter 5.5.
We won’t repeat all that’s new in JMeter 5.5 since there are many sources for that. Here’s an informative one from QAInsights https://qainsights.com/whats-new-in-jmeter-5-5/.
You can read more than 100 articles on JMeter in the RedLine13 blog.
Try JMeter 5.5 for yourself and see what it has to offer. You can easily run your own RedLine13 test and check out JMeter 5.5.