diff --git a/llvm-project b/llvm-project
index 0b969fa9ccf..85ee4ff4e47 160000
--- a/llvm-project
+++ b/llvm-project
@@ -1 +1 @@
-Subproject commit 0b969fa9ccf595abc31942e5d14be784707e960c
+Subproject commit 85ee4ff4e474788abc7abdc939114281c2a68ec1
diff --git a/stl/inc/type_traits b/stl/inc/type_traits
index bf782dbec0b..93d59e1559d 100644
--- a/stl/inc/type_traits
+++ b/stl/inc/type_traits
@@ -1845,7 +1845,11 @@ template <class _Ty, class _Uty>
 struct _Refwrap_has_ctor_from<_Ty, _Uty, void_t<decltype(_Refwrap_ctor_fun<_Ty>(_STD declval<_Uty>()))>> : true_type {};
 
 template <class _Ty>
-class reference_wrapper : public _Weak_types<_Ty>::type { // stand-in for an assignable reference
+class reference_wrapper
+#if !_HAS_CXX20
+    : public _Weak_types<_Ty>::type
+#endif // !_HAS_CXX20
+{
 public:
     static_assert(is_object_v<_Ty> || is_function_v<_Ty>,
         "reference_wrapper<T> requires T to be an object type or a function type.");
diff --git a/stl/inc/yvals_core.h b/stl/inc/yvals_core.h
index 25a63684b06..6c2177f382b 100644
--- a/stl/inc/yvals_core.h
+++ b/stl/inc/yvals_core.h
@@ -130,6 +130,7 @@
 // P0318R1 unwrap_reference, unwrap_ref_decay
 // P0325R4 to_array()
 // P0356R5 bind_front()
+// P0357R3 Supporting Incomplete Types In reference_wrapper
 // P0439R0 enum class memory_order
 // P0457R2 starts_with()/ends_with() For basic_string/basic_string_view
 // P0458R2 contains() For Ordered And Unordered Associative Containers
diff --git a/tests/libcxx/magic_comments.txt b/tests/libcxx/magic_comments.txt
index eb038b57412..a905db0a4e7 100644
--- a/tests/libcxx/magic_comments.txt
+++ b/tests/libcxx/magic_comments.txt
@@ -2,4 +2,5 @@
 // REQUIRES: c++11 || c++14
 // REQUIRES: c++98 || c++03
 // REQUIRES: c++98 || c++03 || c++11 || c++14
+// REQUIRES: c++98 || c++03 || c++11 || c++14 || c++17
 // UNSUPPORTED: c++14, c++17, c++2a