Changes on HTML Github hosted file doesn't show on my website

Hi, i’m using an HTML embed on my website but since the code has more than the allowed character permitted, i have to host an html page on github all is fine but if i see an error or if i change something on the html file, the change appears on Github but not on my website…the only way i can make it work is by uploading an html file with a different file name but it’s really not practical and i should not have to do do that. Any idea why it doesn’t show the changes?