diff --git a/crates/core_arch/src/arm_shared/hints.rs b/crates/core_arch/src/arm_shared/hints.rs
index 54fd78270a..8a25cc1163 100644
--- a/crates/core_arch/src/arm_shared/hints.rs
+++ b/crates/core_arch/src/arm_shared/hints.rs
@@ -83,8 +83,11 @@ pub unsafe fn __sevl() {
 /// improve overall system performance.
 // Section 10.1 of ACLE says that the supported arches are: 8, 6K, 6-M
 // LLVM says "instruction requires: armv6k"
+// On ARMv6 in Thumb mode, T2 is required (see Arm DDI0406C Section A8.8.427)
 #[cfg(any(
-    target_feature = "v6",
+    all(target_feature = "v6k", not(target_feature = "thumb-mode")),
+    target_feature = "v6t2",
+    all(target_feature = "v6", target_feature = "mclass"),
     target_arch = "aarch64",
     target_arch = "arm64ec",
     doc
diff --git a/rust-version b/rust-version
index df8693cd1c..ccc0b55d4d 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-48622726c4a91c87bf6cd4dbe1000c95df59906e
+873d4682c7d285540b8f28bfe637006cef8918a6