diff --git a/Cargo.toml b/Cargo.toml
index b895894..a5991f6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 name = "fingertips"
 version = "0.1.0"
 authors = ["Jason Orendorff <jason.orendorff@gmail.com>"]
+edition = "2018"
 
 [dependencies]
 argparse = "0.2.1"