Changing bundled Ant version

With Ant Support enabled, I have the ability to use the Ant Build tool window and add Ant Build options in my Run/Debug configurations. However, it defaults to a version of Ant that is incompatible with my project (1.10.5). However, my teammates have the correct version (1.9.4), which for them is bundled as well. I would like to configure my bundled Ant version to use the same version as my team. How can I accomplish this without adding a custom Ant externally?