Temporarily Suppress Security Warning

How can I suppress the big red security warning in General Settings in order to keep my client from freaking out until I get the PHP version upgraded to 5.5 on his server.  He is wanting to make some edits tomorrow and I know he will be alarmed since I cannot do the PHP upgrade until the weekend.  Anything that is big, red and contains the word "Security" would spark an unreasonable paranoid reaction.   He needs access to that section or I would lock him out.