diff --git a/libm/src/math/support/float_traits.rs b/libm/src/math/support/float_traits.rs
index fb790e696..4e5011f62 100644
--- a/libm/src/math/support/float_traits.rs
+++ b/libm/src/math/support/float_traits.rs
@@ -289,7 +289,10 @@ macro_rules! float_impl {
                 cfg_if! {
                     // fma is not yet available in `core`
                     if #[cfg(intrinsics_enabled)] {
-                        unsafe{ core::intrinsics::$fma_intrinsic(self, y, z) }
+                        // FIXME(msrv,bench): once our benchmark rustc version is above the
+                        // 2022-09-23 nightly, this can be removed.
+                        #[allow(unused_unsafe)]
+                        unsafe { core::intrinsics::$fma_intrinsic(self, y, z) }
                     } else {
                         super::super::$fma_fn(self, y, z)
                     }
diff --git a/rust-version b/rust-version
index 7420b6200..8854fb959 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-9385c64c95d971329e62917adc4349c8ccdbafe0
+caccb4d0368bd918ef6668af8e13834d07040417