When upgrading above 100 Mbps you will also need to upgrade your equipment; router, switch, etc.
We recommend getting a Gigabit rated dongle for any testing or troubleshooting for your internet.
Once you upgrade to Gigabit-rated equipment you're capable of getting speeds over 100Mbps.
How do I know if my Router or equipment is gig rated?
If you look up your router make and model you will see that it is Gigabit-rated or has Gigabit Ethernet connections.