diff --git a/paperio/dockers/rust/Cargo.toml b/paperio/dockers/rust/Cargo.toml
index 2b989b7..c788c32 100644
--- a/paperio/dockers/rust/Cargo.toml
+++ b/paperio/dockers/rust/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "solution"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 chrono = "0.4.1"