Licensing confusion

It says one license here
but in the source files, there is a file from 2017.

I’m looking for a framework for use in a commercial setting and I am not sure which one the slim framework is under. I only found one other question asking specifically about the licensing from 2016 and with the file having in it 2011-2017 I’m not sure if that means the license has since changed or just hasn’t been updated. My guess would be it is no longer under the MIT license but I want to be sure.

The website and the documentation is licensed under Creative Commons as noted here: - we should make that more explicit.

The framework is licensed under under MIT as noted in the file that is shipped with the source code (