Basecamp isn't what explains the lack of updates to PrototypeJS. jQuery itself is, however. It is (MUCH) faster, got traction quicker, has a larger community a

Basecamp isn't what explains the lack of updates to PrototypeJS. jQuery itself is, however. It is (MUCH) faster, got traction quicker, has a larger community and is definitely more flexible. Rails moved from Prototype for good with version 3, which was released a little over a year ago - it would make no sense for Basecamp to stick with prototype.