diff --git a/Cargo.toml b/Cargo.toml
index ec23325..18bc31a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ description = "Helps create a swirly timelapse gif"
 repository = "https://github.com/mattico/spiralizer"
 keywords = ["image", "gif"]
 license = "MIT"
+edition = "2018"
 
 [dependencies]
 clap = "2"
diff --git a/src/main.rs b/src/main.rs
index 79499a4..172c3bf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,3 @@
-extern crate clap;
-extern crate image;
-extern crate memmap;
-extern crate pbr;
-extern crate tempfile;
-
 use std::f64::consts::PI;
 use std::fs::File;
 use std::io::prelude::*;