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Running PDFTeXify in MiKTeX Revision 2.9.6809 I sometimes get this warning about PDF versions.

pdfTeX warning: pdflatex.exe (file ./Plato.pdf): PDF inclusion: found PDF version <1.6>, but at most version <1.5> allowed

In fact the PDFs display just fine. But is there an issue here that I should know about? Could it become a serious problem at some point? Or should I just ignore it?

marked as duplicate by Phelype Oleinik, user156344, Stefan Pinnow, Raaja, TeXnician Apr 13 at 17:38

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    It depends on what your Plato.pdf contains. If it does not contain any PDF 1.6 features then you should be fine, otherwise you can do \pdfminorversion=6 to fix that. – Phelype Oleinik Apr 13 at 15:25

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