I am trying to upgrade my iTunes to 11.1.3 and I keep getting a message that I have an invalid signature. Help!

I just received the iPhone 5s, but cannot connect to my iTunes because it is out of date. However, everytime I try to install the new version of iTunes, I get a message that the signature is invalid. Help! What do I do to fix the "signature"?

Hello there, karimaz1011.
You may want to go directly to Apple's iTunes Download page and download and install the latest version manually:
Apple - iTunes - Download iTunes Now
http://www.apple.com/itunes/download/
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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