diff --git a/bincode-transport/src/lib.rs b/bincode-transport/src/lib.rs
index b4f9da0..61c9916 100644
--- a/bincode-transport/src/lib.rs
+++ b/bincode-transport/src/lib.rs
@@ -81,7 +81,7 @@ where
     }
 }
 
-fn convert<E: Into<Box<Error + Send + Sync>>>(poll: Poll<Result<(), E>>) -> Poll<io::Result<()>> {
+fn convert<E: Into<Box<dyn Error + Send + Sync>>>(poll: Poll<Result<(), E>>) -> Poll<io::Result<()>> {
     match poll {
         Poll::Pending => Poll::Pending,
         Poll::Ready(Ok(())) => Poll::Ready(Ok(())),
diff --git a/json-transport/src/lib.rs b/json-transport/src/lib.rs
index 4e8b4e2..34f7777 100644
--- a/json-transport/src/lib.rs
+++ b/json-transport/src/lib.rs
@@ -88,7 +88,7 @@ where
     }
 }
 
-fn convert<E: Into<Box<Error + Send + Sync>>>(poll: Poll<Result<(), E>>) -> Poll<io::Result<()>> {
+fn convert<E: Into<Box<dyn Error + Send + Sync>>>(poll: Poll<Result<(), E>>) -> Poll<io::Result<()>> {
     match poll {
         Poll::Pending => Poll::Pending,
         Poll::Ready(Ok(())) => Poll::Ready(Ok(())),