diff --git a/rust-version b/rust-version
index 4c43ab08421..391c95bfc14 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-26c9b0046f96403cdf959e4e1f874ec25f9dbf6f
+66f64a441a05cee8d5d701477b43ed851f778f3a
diff --git a/tests/run-pass/available-concurrency.rs b/tests/run-pass/available-concurrency.rs
index 422046c62d6..eb4d09b1f54 100644
--- a/tests/run-pass/available-concurrency.rs
+++ b/tests/run-pass/available-concurrency.rs
@@ -1,5 +1,3 @@
-#![feature(available_parallelism)]
-
 fn main() {
     assert_eq!(std::thread::available_parallelism().unwrap().get(), 1);
 }