diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 4d17ff07..cbad0344 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -187,6 +187,10 @@ jobs:
       run: cargo update --package polling --precise 3.10.0
     - name: Pin last async-lock release supporting our msrv of Rust 1.68
       run: cargo update --package async-lock --precise 3.4.1
+    - name: Pin last unicode-ident release supporting our msrv of Rust 1.68
+      run: cargo update --package unicode-ident --precise 1.0.22
+    - name: Pin last syn release supporting our msrv of Rust 1.68
+      run: cargo update --package syn@2.0.117 --precise 2.0.114
 
     # build
     - name: cargo check x11rb-protocol with all features
diff --git a/xtrace-example/src/main.rs b/xtrace-example/src/main.rs
index b8425c14..378dbe32 100644
--- a/xtrace-example/src/main.rs
+++ b/xtrace-example/src/main.rs
@@ -88,7 +88,7 @@ async fn handle_client_impl(client: Async<TcpStream>) -> IOResult<()> {
 
     // try_join polls both futures and returns an error once one of them returns an error.
     // (It also returns a result once both futures are done, but that should not matter here).
-    futures_util::try_join!(future1, future2)?;
+    let _ = futures_util::try_join!(future1, future2)?;
 
     Ok(())
 }