diff --git a/msim/src/sim/runtime/mod.rs b/msim/src/sim/runtime/mod.rs
index b69056f..26db9c8 100644
--- a/msim/src/sim/runtime/mod.rs
+++ b/msim/src/sim/runtime/mod.rs
@@ -483,7 +483,8 @@ impl NodeHandle {
 
     /// Join the node.
     /// TODO: unimplemented
-    #[expect(clippy::result_unit_err)]
+    // TODO: add this line after upgrading to toolchain 1.81
+    //#[expect(clippy::result_unit_err)]
     pub fn join(self) -> Result<(), ()> {
         warn!("TODO: implement NodeHandle::join()");
         Ok(())
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 4cef0b7..a56a283 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.81"
+channel = "1.80.1"