Lil Wayne's $51 million lawsuit against Cash Money for screwing him out of his Carter V advance and other royalties just got a lot bigger.

Today, he filed an amended petition to the lawsuit in a New Orleans court which includes Universal Music Group, who he accuses of conspiring with Birdman and Slim to deny him his Young Money profits.

[Related: Lil Wayne blasts Cash Money with Drake by his side.]

Wayne alleges Universal backdated a deal to make it look like it was signed before Young Money's deal with Cash Money ran out. By doing that, it prevented Wayne from profiting off of Young Money artists like Drake and Nicki Minaj and allowed Cash Money to take out advances on Drake and the rest that Birdman wouldn't have been able to otherwise.

"Despite Universal being aware of Cash Money’s obligations to pay royalties and profits to Plaintiffs, and Cash Money’s failure to do so, Universal made a series of huge cash advances to Cash Money which Universal contended were nonetheless collateralized by, and recoupable by Universal against, the future revenues on Drake and other artist records and albums delivered by Cash Money," the amended petition states. "Universal knew that Cash Money would not reserve from such advances sufficient funds to meet its obligations to Plaintiffs, pay to Plaintiffs earnings on the records co-owned by them, or to pay or account to other artists or vendors."