diff --git a/README.md b/README.md
index cbe156e0..2739175c 100644
--- a/README.md
+++ b/README.md
@@ -27,13 +27,13 @@ repository and compiled from source or installed from
 of the nightly toolchain is supported at any given time.
 
 <!-- NOTE: Keep in sync with nightly date on rust-toolchain. -->
-It's recommended to use `nightly-2021-08-31` toolchain.
-You can install it by using `rustup install nightly-2021-08-31` if you already have rustup.
+It's recommended to use `nightly-2021-09-10` toolchain.
+You can install it by using `rustup install nightly-2021-09-10` if you already have rustup.
 Then you can do:
 
 ```sh
-$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2021-08-31
-$ cargo +nightly-2021-08-31 install --git https://github.com/rust-lang/rust-semverver
+$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2021-09-10
+$ cargo +nightly-2021-09-10 install --git https://github.com/rust-lang/rust-semverver
 ```
 
 You'd also need `cmake` for some dependencies, and a few common libraries (if you hit
diff --git a/rust-toolchain b/rust-toolchain
index 63050498..544711cd 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,4 +1,4 @@
 # NOTE: Keep in sync with nightly date on README
 [toolchain]
-channel = "nightly-2021-08-31"
+channel = "nightly-2021-09-10"
 components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/src/lib.rs b/src/lib.rs
index 619d7d08..2a283e8d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,10 +7,10 @@
 #![allow(clippy::unnested_or_patterns)]
 #![deny(warnings)]
 
-extern crate rustc_hir; // Requires `rustup component add rustc-dev`
+extern crate rustc_const_eval; // Requires `rustup component add rustc-dev`
+extern crate rustc_hir;
 extern crate rustc_infer;
 extern crate rustc_middle;
-extern crate rustc_mir;
 extern crate rustc_session;
 extern crate rustc_span;
 extern crate rustc_trait_selection;
diff --git a/src/traverse.rs b/src/traverse.rs
index f09f7dee..6ce3aa5c 100644
--- a/src/traverse.rs
+++ b/src/traverse.rs
@@ -31,7 +31,7 @@ use rustc_middle::{
         Visibility::Public,
     },
 };
-use rustc_mir::const_eval::is_const_fn;
+use rustc_const_eval::const_eval::is_const_fn;
 use std::collections::{BTreeMap, HashSet, VecDeque};
 
 /// The main entry point to our analysis passes.