diff --git a/release.nix b/release.nix
index ea936146e7f..ad09d46d9fd 100644
--- a/release.nix
+++ b/release.nix
@@ -1,7 +1,7 @@
 { nix ? builtins.fetchGit ./.
-, nixpkgs ? builtins.fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-20.03.tar.gz
+, nixpkgs ? builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/nixos-21.05-small.tar.gz
 , officialRelease ? false
-, systems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ]
+, systems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ]
 }:
 
 let
@@ -315,7 +315,7 @@ let
           substitute ${./scripts/install.in} $out/install \
             ${pkgs.lib.concatMapStrings
               (system: "--replace '@binaryTarball_${system}@' $(nix hash-file --base16 --type sha256 ${binaryTarball.${system}}/*.tar.xz) ")
-              [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ]
+              [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux" ]
             } \
             --replace '@nixVersion@' ${build.x86_64-linux.src.version}