diff --git a/rust-version b/rust-version
index 26199e0b483c..0c82a59c6d1d 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-bb587b1a1737738658d2eaecd4c8c1cab555257a
+42a4673fbd40b09a99d057eaa9b3e5579b54c184
diff --git a/tests/compile-fail/validity/execute_memory.rs b/tests/compile-fail/validity/execute_memory.rs
index 5230e7fdf529..4be80fe39d01 100644
--- a/tests/compile-fail/validity/execute_memory.rs
+++ b/tests/compile-fail/validity/execute_memory.rs
@@ -1,3 +1,4 @@
+// ignore-test FIXME (Miri issue #1711)
 #![feature(box_syntax)]
 
 fn main() {
diff --git a/tests/compile-fail/validity/invalid_fnptr_uninit.rs b/tests/compile-fail/validity/invalid_fnptr_uninit.rs
index dbd6711dc65a..ab0e870b420b 100644
--- a/tests/compile-fail/validity/invalid_fnptr_uninit.rs
+++ b/tests/compile-fail/validity/invalid_fnptr_uninit.rs
@@ -1,3 +1,4 @@
+// ignore-test FIXME (Miri issue #1711)
 #![allow(invalid_value)]
 
 union MyUninit {