You can find it on your Updates page. The new builds should be up on Humble soon too (check the version numbers on the files).

This is a quick bug-fixing update. Due to a rogue dev-debug-mode flag being mistakenly switched on in 0.1.2, much of the standard Lua library was accessible. So if you've started using PICO-8 recently, not knowing the library is not supposed to be there and tried to use it, sorry about the confusion!

v0.1.3 Changes:

Added: paste into commandline

Fixed: lua standard libraries accessible

Fixed: command-line loading doesn't work

Fixed: music pattern finished too early when all tracks set to looping

Fixed: peek()ing odd bytes in sfx address space masks bit 7

Fixed: cstore and reload from code space should have no effect