diff --git a/Cargo.toml b/Cargo.toml
index 523426d..eaa14ba 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ repository = "https://github.com/phaazon/splines"
 documentation = "https://docs.rs/splines"
 readme = "README.md"
 
-edition = "2018"
+edition = "2021"
 
 [badges]
 travis-ci = { repository = "phaazon/splines", branch = "master" }