diff --git a/jwt-authorizer/src/layer.rs b/jwt-authorizer/src/layer.rs
index 1fbbaec..0b96120 100644
--- a/jwt-authorizer/src/layer.rs
+++ b/jwt-authorizer/src/layer.rs
@@ -8,7 +8,6 @@ use std::future::Future;
 use std::pin::Pin;
 use std::sync::Arc;
 use std::task::{Context, Poll};
-use tokio::sync::Mutex;
 use tower_layer::Layer;
 use tower_service::Service;