diff --git a/Cargo.toml b/Cargo.toml
index 6b23df658..da47a8ca0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "rustyline"
-version = "9.1.0"
+version = "9.1.1"
 authors = ["Katsu Kawakami <kkawa1570@gmail.com>"]
-edition = "2021"
+edition = "2018"
 description = "Rustyline, a readline implementation based on Antirez's Linenoise"
 documentation = "http://docs.rs/rustyline"
 repository = "https://github.com/kkawakam/rustyline"