Justin Bieber dominated the charts in 2015 and 2016 with “Love Yourself”, co-written by Ed Sheeran. Now it appears the two music giants are collaborating once again.

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On Tuesday, Bieber and his manager Scooter Braun both posted cryptic tweets which simply read “10,” each accompanied by photos of Bieber and Sheeran standing in front of green screens.

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The tweets left fans scratching their heads, anticipating a possible new collaboration and wondering if “10” refers to the title of the song, or perhaps how many days everyone has to wait to find out.

For now, it looks like fans will just have to wait and see.