diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d148c9e1..89b756d1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -212,7 +212,7 @@ jobs:
       fail-fast: false
       matrix:
         rust-version: [
-          1.70.0, # current stable
+          1.71.0, # current stable
           beta
         ]
     steps:
diff --git a/muxers/mplex/src/lib.rs b/muxers/mplex/src/lib.rs
index 7aa665d7..81c5147a 100644
--- a/muxers/mplex/src/lib.rs
+++ b/muxers/mplex/src/lib.rs
@@ -55,7 +55,7 @@ where
 
     fn upgrade_inbound(self, socket: C, _: Self::Info) -> Self::Future {
         future::ready(Ok(Multiplex {
-            #[allow(clippy::arc_with_non_send_sync)] // `T` is not enforced to be `Send` but we don't want to constrain it either.
+            #[allow(unknown_lints, clippy::arc_with_non_send_sync)] // `T` is not enforced to be `Send` but we don't want to constrain it either.
             io: Arc::new(Mutex::new(io::Multiplexed::new(socket, self))),
         }))
     }
@@ -71,7 +71,7 @@ where
 
     fn upgrade_outbound(self, socket: C, _: Self::Info) -> Self::Future {
         future::ready(Ok(Multiplex {
-            #[allow(clippy::arc_with_non_send_sync)] // `T` is not enforced to be `Send` but we don't want to constrain it either.
+            #[allow(unknown_lints, clippy::arc_with_non_send_sync)] // `T` is not enforced to be `Send` but we don't want to constrain it either.
             io: Arc::new(Mutex::new(io::Multiplexed::new(socket, self))),
         }))
     }