diff --git a/compiler/rustc_target/src/target_features.rs b/compiler/rustc_target/src/target_features.rs
index 017fd3072fdb7..0ab1b8f299812 100644
--- a/compiler/rustc_target/src/target_features.rs
+++ b/compiler/rustc_target/src/target_features.rs
@@ -322,7 +322,7 @@ const WASM_ALLOWED_FEATURES: &[(&str, Stability)] = &[
     ("mutable-globals", Stable),
     ("nontrapping-fptoint", Stable),
     ("reference-types", Unstable(sym::wasm_target_feature)),
-    ("relaxed-simd", Unstable(sym::wasm_target_feature)),
+    ("relaxed-simd", Stable),
     ("sign-ext", Stable),
     ("simd128", Stable),
     // tidy-alphabetical-end
diff --git a/library/stdarch b/library/stdarch
index df3618d9f3516..7783b01f63d25 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit df3618d9f35165f4bc548114e511c49c29e1fd9b
+Subproject commit 7783b01f63d25c1220bbe9731ec14bd2811c22cc
diff --git a/tests/ui/target-feature/wasm-relaxed-simd.rs b/tests/ui/target-feature/wasm-relaxed-simd.rs
new file mode 100644
index 0000000000000..34e7c3d506659
--- /dev/null
+++ b/tests/ui/target-feature/wasm-relaxed-simd.rs
@@ -0,0 +1,9 @@
+//@ only-wasm32-wasip1
+//@ compile-flags: -Ctarget-feature=+relaxed-simd --crate-type=lib
+//@ build-pass
+
+use std::arch::wasm32::*;
+
+pub fn test(a: v128, b: v128, m: v128) -> v128 {
+    i64x2_relaxed_laneselect(a, b, m)
+}