upgrade iox 10.9.5 to at least 10.10

What year model is your iMac...?

(you can check by going to: Apple > About This Mac)

If you have a 2007 - early 2009 iMac, see > How to upgrade to OS X El Capitan - Apple Support

If you have a 2009 - 2011 iMac, see > How to upgrade to macOS High Sierra - Apple Support

If you have a 2012 or later iMac, see > How to upgrade to macOS Mojave - Apple Support

Back up your data, check your applications for compatibility, and depending on which Mac model you have, download El Capitan, High Sierra, or Mojave from the Mac App Store.

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Your welcome!