How can I update certificates on my system to fix wget's error: "Unable to establish SSL connection."?

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http://unix.stackexchange.com – Sometimes I notice that I am unable to connect via SSL with curl and wget to websites that have certificates that should be valid. One example might be https://squareup.com/ which has a Verisign class 3 certificate - I assume a large banking-related site has a certificate that should be widely accepted. However when I try and run: wget -O - https://squareup.com/ #grab the homepage and send it to stdout I get the error: Unable to establish SSL connection. Does this mean my system's certs, perhaps one of the cacert.pem files, is out of date? I'm on Ubuntu 12.04.1. Yes, I know I can u (HowTos)