Thread:Project:Support desk/Fatal error: Maximum execution time of 60 seconds exceeded in Database.php/reply (8)

Yes, in your case I would upgrade MediaWiki as well. Please follow the guide at Upgrade.

Should the maximum execution time still be too low then, you can try setting it to something ridiculously high (like 30 minutes or so) just to see, if it finishes at all, or if it finishes never. Was your server also slow with MediaWiki 1.15 (so that it might jst be higher requirements of the new software versions, which now make it hit the maximum execution time) or would you - from looking at your hardware - expect the wiki to be really fast?