diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 168775667651d..1e6a97239637c 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -227,6 +227,7 @@
 #![feature(try_blocks)]
 #![feature(unboxed_closures)]
 #![feature(unsized_fn_params)]
+#![feature(wasm_simd_const_internals)]
 #![feature(with_negative_coherence)]
 // tidy-alphabetical-end
 //
diff --git a/library/stdarch b/library/stdarch
index 0669fa8a6e48a..b7339dc8d2a6d 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit 0669fa8a6e48afde64e0ceccdf462a9cc3fb689f
+Subproject commit b7339dc8d2a6dc25872dd05331eaf4d4b8855854