Having high Ping for no reason

So I tried playing Path of Exile for the first time after moving. I am having a pretty high (though stable) Ping of ~140ms. The weird thing about this is that my roommate, who also plays Path of Exile has about 14 Ping, while I have high ping (no matter if he's currently playing or not).

I am connected to my closest server and running the game on Linux Mint. Does anyone have an idea how to fix my ping?