diff --git a/rust-version b/rust-version
index 04b9f1c3fa..dd48038e07 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-942db6782f4a28c55b0b75b38fd4394d0483390f
+e0607238c95df66e3d25a6c17aebe18c6726fc74
diff --git a/src/lib.rs b/src/lib.rs
index feab5a9a2f..8c4b15a65c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+#![cfg_attr(bootstrap, feature(trait_upcasting))]
 #![feature(rustc_private)]
 #![feature(cfg_match)]
 #![feature(cell_update)]
@@ -10,7 +11,6 @@
 #![feature(yeet_expr)]
 #![feature(nonzero_ops)]
 #![feature(let_chains)]
-#![feature(trait_upcasting)]
 #![feature(strict_overflow_ops)]
 #![feature(pointer_is_aligned_to)]
 #![feature(unqualified_local_imports)]
diff --git a/tests/fail/dyn-upcast-trait-mismatch.rs b/tests/fail/dyn-upcast-trait-mismatch.rs
index f450e7e652..1fd791a91f 100644
--- a/tests/fail/dyn-upcast-trait-mismatch.rs
+++ b/tests/fail/dyn-upcast-trait-mismatch.rs
@@ -1,9 +1,6 @@
 // Validation stops this too early.
 //@compile-flags: -Zmiri-disable-validation
 
-#![feature(trait_upcasting)]
-#![allow(incomplete_features)]
-
 trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
     #[allow(dead_code)]
     fn a(&self) -> i32 {
diff --git a/tests/pass/binops.rs b/tests/pass/binops.rs
index 0988d7ccc4..0aff7acb29 100644
--- a/tests/pass/binops.rs
+++ b/tests/pass/binops.rs
@@ -2,23 +2,23 @@
 
 fn test_nil() {
     assert_eq!((), ());
-    assert!((!(() != ())));
-    assert!((!(() < ())));
-    assert!((() <= ()));
-    assert!((!(() > ())));
-    assert!((() >= ()));
+    assert!(!(() != ()));
+    assert!(!(() < ()));
+    assert!(() <= ());
+    assert!(!(() > ()));
+    assert!(() >= ());
 }
 
 fn test_bool() {
-    assert!((!(true < false)));
-    assert!((!(true <= false)));
-    assert!((true > false));
-    assert!((true >= false));
+    assert!(!(true < false));
+    assert!(!(true <= false));
+    assert!(true > false);
+    assert!(true >= false);
 
-    assert!((false < true));
-    assert!((false <= true));
-    assert!((!(false > true)));
-    assert!((!(false >= true)));
+    assert!(false < true);
+    assert!(false <= true);
+    assert!(!(false > true));
+    assert!(!(false >= true));
 
     // Bools support bitwise binops
     assert_eq!(false & false, false);
@@ -65,9 +65,9 @@ fn test_class() {
 
     assert_eq!(q, r);
     r.y = 17;
-    assert!((r.y != q.y));
+    assert!(r.y != q.y);
     assert_eq!(r.y, 17);
-    assert!((q != r));
+    assert!(q != r);
 }
 
 pub fn main() {
diff --git a/tests/pass/box-custom-alloc.rs b/tests/pass/box-custom-alloc.rs
index 71ce019187..f0614313e5 100644
--- a/tests/pass/box-custom-alloc.rs
+++ b/tests/pass/box-custom-alloc.rs
@@ -1,7 +1,6 @@
 //@revisions: stack tree
 //@[tree]compile-flags: -Zmiri-tree-borrows
-#![allow(incomplete_features)] // for trait upcasting
-#![feature(allocator_api, trait_upcasting)]
+#![feature(allocator_api)]
 
 use std::alloc::{AllocError, Allocator, Layout};
 use std::cell::Cell;
diff --git a/tests/pass/dyn-upcast.rs b/tests/pass/dyn-upcast.rs
index f100c4d6a8..6f8adc0964 100644
--- a/tests/pass/dyn-upcast.rs
+++ b/tests/pass/dyn-upcast.rs
@@ -1,6 +1,3 @@
-#![feature(trait_upcasting)]
-#![allow(incomplete_features)]
-
 use std::fmt;
 
 fn main() {