How much does 1 backlink affect the ahrefs DR

My website has been 0.3 DR for a while. I have a few spammy backlinks. I managed to get a backlink from a genuine blog which is DR 28. I was excited to see what the change in DR would be but when ahrefs saw the link, the DR is still 0.3. I thought it would change at least 0.1 but nothing.

If I got 5 backlinks would I see any improvement?