diff --git a/src/bin/main.rs b/src/bin/main.rs
index 56b07222212f8..92fe8b9c51439 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -689,6 +689,7 @@ fn edition_from_edition_str(edition_str: &str) -> Result<Edition> {
     match edition_str {
         "2015" => Ok(Edition::Edition2015),
         "2018" => Ok(Edition::Edition2018),
+        "2021" => Ok(Edition::Edition2021),
         _ => Err(format_err!("Invalid value for `--edition`")),
     }
 }