diff --git a/rust-version b/rust-version
index 464ab46b92..a6374bf120 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-59f551a2dcf57c0d3d96ac5ef60e000524210469
+0309953232d9957aef4c7c5a24fcb30735b2066b
diff --git a/tests/compile-fail/validity/cast_fn_ptr1.rs b/tests/compile-fail/validity/cast_fn_ptr1.rs
index eb94ba256b..d755c163bb 100644
--- a/tests/compile-fail/validity/cast_fn_ptr1.rs
+++ b/tests/compile-fail/validity/cast_fn_ptr1.rs
@@ -7,5 +7,5 @@ fn main() {
     let g: fn(*const i32) = unsafe { std::mem::transmute(f as fn(&i32)) };
 
     g(0usize as *const i32)
-    //~^ ERROR encountered a NULL reference
+    //~^ ERROR encountered a null reference
 }
diff --git a/tests/compile-fail/validity/cast_fn_ptr2.rs b/tests/compile-fail/validity/cast_fn_ptr2.rs
index a3faa84f1d..d78d56b5b6 100644
--- a/tests/compile-fail/validity/cast_fn_ptr2.rs
+++ b/tests/compile-fail/validity/cast_fn_ptr2.rs
@@ -7,5 +7,5 @@ fn main() {
     let g: fn() -> &'static i32 = unsafe { std::mem::transmute(f as fn() -> *const i32) };
 
     let _x = g();
-    //~^ ERROR encountered a NULL reference
+    //~^ ERROR encountered a null reference
 }