How to fix weak security with my WiFi network

See this support article about 'Recommended settings for Wi-Fi routers and access points'

Click here --> https://support.apple.com/HT202068

You will have to access your Router’s settings & change the wireless security to WPA2-PSK.

These are for my router so it may be similar to your settings:

• Login to your hub via 192.168.0.1 or whichever address your router uses.
• Enter your admin name and password (this is printed on a sticker on the hub if you haven’t changed the password)
• Once logged in, go to Advanced settings > Wireless > Security
• Click on the dropdown next to Security and change it to WPA2-PSK (note you’ll need to do this for both the 2.4 GHz & 5 GHz network if you’ve separated these)
• Once you hit save the hub will refresh and when it reconnects the WiFi you should find the message has disappeared