How to use `this` inside arrow function

I have been struggling with this for a while in arrow functions.

I face a problem where I use axios library and I ended up doing something like this in a object method:

let copy_of_this = this;
axios.get('/api/v1/entries/')
  .then(response => {
     copy_of_this.entries = response.data;
   });

How can I "unbind" this in arrow functions? I know I can use anonymous functions, but I would like to know the version where I use I use arrow functions.

Thanks in advance for answers!