diff --git a/Cargo.toml b/Cargo.toml
index ba7c84a..dcd8e3e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 description = "Interact with the github.com/containers/image library via skopeo"
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 name = "containers-image-proxy"
 readme = "README.md"
diff --git a/src/imageproxy.rs b/src/imageproxy.rs
index 0f4e6fa..eb6104e 100644
--- a/src/imageproxy.rs
+++ b/src/imageproxy.rs
@@ -10,7 +10,6 @@ use nix::sys::socket::{self as nixsocket, ControlMessageOwned};
 use nix::sys::uio::IoVec;
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
-use std::convert::TryFrom;
 use std::fs::File;
 use std::os::unix::io::AsRawFd;
 use std::os::unix::prelude::{CommandExt, FromRawFd, RawFd};
@@ -419,6 +418,7 @@ impl ImageProxy {
     /// Close the connection and wait for the child process to exit successfully.
     #[instrument]
     pub async fn finalize(self) -> Result<()> {
+        let _ = &self;
         let req = Request::new_bare("Shutdown");
         let sendbuf = serde_json::to_vec(&req)?;
         // SAFETY: Only panics if a worker thread already panic'd