Yesterday (March 23), Kendrick Lamar hinted that his fourth album might be on its way, wiping his Instagram clean and replacing it with a single image depicting the numeral IV.

As it turns out, that numeral was also hinting at the title of a new song that he released late last night titled “The Heart Part 4”, his first solo track single last year’s surprise drop untitled, unmastered. The song is essentially a diss track, with K.Dot taking shots at a mystery rapper (“My fans can’t wait for me to son your punk ass and crush your whole lil sh*t / I’ll Big Pun your punk ass, you a scared lil bitch”).

There’s a particularly noteworthy line in the song that hints that a new album might be closer than you think: “Y’all got ‘til April the 7th to get y’all shit together.”

Both the new track and the April 7 date lands before Kendrick Lamar headlines Coachella next month. Listen to “The Heart Part 4” via Spotify below.