diff --git a/compiler/rustc_target/src/target_features.rs b/compiler/rustc_target/src/target_features.rs
index 2b7ac68c21dfb..33f3f9195ba39 100644
--- a/compiler/rustc_target/src/target_features.rs
+++ b/compiler/rustc_target/src/target_features.rs
@@ -318,7 +318,7 @@ const WASM_ALLOWED_FEATURES: &[(&str, Stability)] = &[
     ("mutable-globals", Unstable(sym::wasm_target_feature)),
     ("nontrapping-fptoint", Unstable(sym::wasm_target_feature)),
     ("reference-types", Unstable(sym::wasm_target_feature)),
-    ("relaxed-simd", Unstable(sym::wasm_target_feature)),
+    ("relaxed-simd", Stable),
     ("sign-ext", Unstable(sym::wasm_target_feature)),
     ("simd128", Stable),
     // tidy-alphabetical-end
diff --git a/library/stdarch b/library/stdarch
index 56087ea170d87..c3cca2e14cbe8 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit 56087ea170d878a7a57b3a5725e0c00f5f5cad70
+Subproject commit c3cca2e14cbe86275695bb449743afdf75df1c6d