diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index 1770b635f6..84a83af4a5 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -39,7 +39,11 @@
   };
 
   nixpkgs-mozilla = pkgs.callPackages ./nixpkgs-mozilla {};
-  nightlyRust = depot.pkgs.nixpkgs-mozilla.latest.rustChannels.nightly;
+  nightlyRust = depot.pkgs.nixpkgs-mozilla.rustChannelOf {
+    date = "2021-11-20";
+    channel = "nightly";
+    sha256 = "sha256:121f91ghml2dpvlqb0r7bk7gqgbjj5a1zv66zk0samnyq8zqp7h6";
+  };
   nightlyRustPlatform = pkgs.makeRustPlatform {
     rustc = depot.pkgs.nightlyRust.rust;
     inherit (depot.pkgs.nightlyRust) cargo;