diff --git a/src/tools/miri/bench-cargo-miri/serde2/src/main.rs b/src/tools/miri/bench-cargo-miri/serde2/src/main.rs
index c81b32c13fef..83c04b9dd5f5 100644
--- a/src/tools/miri/bench-cargo-miri/serde2/src/main.rs
+++ b/src/tools/miri/bench-cargo-miri/serde2/src/main.rs
@@ -5,6 +5,7 @@ use serde::Deserialize;
 use std::thread;
 
 #[derive(Deserialize)]
+#[allow(unused)]
 struct DeriveStruct {
     buffer: Vec<i16>,
 }
diff --git a/src/tools/miri/rust-version b/src/tools/miri/rust-version
index 0a3daa2d0864..eb0301bee2ac 100644
--- a/src/tools/miri/rust-version
+++ b/src/tools/miri/rust-version
@@ -1 +1 @@
-edabf59ca4646b3fc1a961c26431215001043f6a
+b1ab3b738ac718da74cd4aa0bb7f362d0adbdf84