If Mariah Yeater thinks she's dodged the Justin Bieber lawsuit bullet by dismissing her paternity lawsuit, she needs to do some re-thinking.

TMZ broke the story, Yeater dismissed the suit last Thursday, after Justin and his team made it clear ... they were going to sue Yeater and her lawyers for filing a malicious claim.

Despite the fact that Yeater's claim has now been dismissed and the 2 lawyers who filed it have quit, Justin is not backing down from his threat.

The singer's publicist, Matthew Hiltzik, tells TMZ, "We intend to still hold them accountable."