I've just installed Virtuemart 3 on J3. With VM3, I also installed its plugin for PDF invoices etc. So now I see that updated is available for TcPdf Library. But also there's a warning message:
"Before updating ensure that the update is compatible with your Joomla! installation." I don't know if it is compatible.
Versions-wise. My Joomla is 3.6.0 and my Virtuemart is 3.0.16