diff --git a/sync/Cargo.toml b/sync/Cargo.toml
index b74e672c7f..af38fd15b9 100644
--- a/sync/Cargo.toml
+++ b/sync/Cargo.toml
@@ -2,6 +2,7 @@
 name = "sync"
 version = "0.1.0"
 authors = ["The Chromium OS Authors"]
+edition = "2018"
 include = ["src/**/*", "Cargo.toml"]
 
 [workspace]