Resolve warning: PDF inclusion: found PDF version 1.5, but at most version 1.4 allowed

I have found the option to include images in my documents in PDF format to be much more convenient than using image formats such as PNG or JPEG. At least in my documents (which I compiled with pdflatex), the images were generally better-looking and sharper. A minor problem with this solution is that pdflatex in … More Resolve warning: PDF inclusion: found PDF version 1.5, but at most version 1.4 allowed