Skype has released Skype 184.108.40.2067 to block a critical vulnerability related to receiving a malicious file via an instant message. Also resolved are problems with video freezing in networks with high packet loss, and unspecified minor bugs. Unfortunately, the horrid design of Skype 5 remains in place, but, luckily, the still-functional Skype 2.8 does not suffer from Skype 5’s security vulnerability. So, you can either upgrade to Skype 220.127.116.117 or stick with (or downgrade to) Skype 2.8. I recommend downloading manually; the automatic updater failed when I chose Skype > Check for Updates. (Free, 20.2 MB)
Increase Boom Volume Quickly
If you're using Boom to increase the volume on your Mac, you can change the amount to which Boom increases the volume quickly in two ways. Either use the slider available from Boom's menu bar icon, or enable and set hotkeys (Command-Shift-+ and Command-Shift-- by default). Then, when you need that push to 11, more volume is available at the click of the mouse or tap of the keyboard.
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So as long as you have one of them, you should be fine from a security standpoint.