diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f0c852367a2..3b2cc3d4c3a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -220,7 +220,7 @@ jobs:
         rust-version: [
           # 1.72.0, # current stable
           # beta,
-          nightly-2023-09-10
+          nightly-2023-11-26
         ]
     steps:
       - uses: actions/checkout@v4
diff --git a/muxers/mplex/src/io.rs b/muxers/mplex/src/io.rs
index 753294a7845..50fc0fc1d3f 100644
--- a/muxers/mplex/src/io.rs
+++ b/muxers/mplex/src/io.rs
@@ -224,7 +224,7 @@ where
             // yield to give the current task a chance to read
             // from the respective substreams.
             if num_buffered == self.config.max_buffer_len {
-                cx.waker().clone().wake();
+                cx.waker().wake_by_ref();
                 return Poll::Pending;
             }
 
@@ -456,7 +456,7 @@ where
             // next frame for `id`, yield to give the current task
             // a chance to read from the other substream(s).
             if num_buffered == self.config.max_buffer_len {
-                cx.waker().clone().wake();
+                cx.waker().wake_by_ref();
                 return Poll::Pending;
             }
 
@@ -663,7 +663,7 @@ where
                     connection=%self.id,
                     "No task to read from blocked stream. Waking current task."
                 );
-                cx.waker().clone().wake();
+                cx.waker().wake_by_ref();
             } else if let Some(id) = stream_id {
                 // We woke some other task, but are still interested in
                 // reading `Data` frames from the current stream when unblocked.
diff --git a/protocols/relay/src/behaviour/rate_limiter.rs b/protocols/relay/src/behaviour/rate_limiter.rs
index a4a127e1253..9c4f67d04a8 100644
--- a/protocols/relay/src/behaviour/rate_limiter.rs
+++ b/protocols/relay/src/behaviour/rate_limiter.rs
@@ -124,7 +124,7 @@ impl<Id: Eq + PartialEq + Hash + Clone> GenericRateLimiter<Id> {
         // Note when used with a high number of buckets: This loop refills all the to-be-refilled
         // buckets at once, thus potentially delaying the parent call to `try_next`.
         loop {
-            match self.refill_schedule.get(0) {
+            match self.refill_schedule.front() {
                 // Only continue if (a) there is a bucket and (b) the bucket has not already been
                 // refilled recently.
                 Some((last_refill, _)) if now.duration_since(*last_refill) >= self.interval => {}