diff --git a/Cargo.toml b/Cargo.toml
index 748c960..d74d808 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ name = "the-fall"
 version = "0.0.1"
 authors = ["Leandro Lisboa Penz <lpenz@lpenz.org>"]
 build = "build.rs"
-edition = "2021"
+edition = "2018"
 
 [lib]
 doctest = false
diff --git a/src/input.rs b/src/input.rs
index 312325c..fc237be 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -2,6 +2,7 @@
 // This file is subject to the terms and conditions defined in
 // file 'LICENSE', which is part of this source code package.
 
+use std::convert::{TryFrom, TryInto};
 use std::io;
 use std::str::FromStr;
 
diff --git a/tests/episode1.rs b/tests/episode1.rs
index e266d12..4b5e979 100644
--- a/tests/episode1.rs
+++ b/tests/episode1.rs
@@ -2,6 +2,7 @@
 // This file is subject to the terms and conditions defined in
 // file 'LICENSE', which is part of this source code package.
 
+use std::convert::TryFrom;
 use std::iter;
 
 use anyhow::Result;