diff --git a/.github/workflows/pre-release.yml b/.github/workflows/pre-release.yml
index 0fde0aea..ba171721 100644
--- a/.github/workflows/pre-release.yml
+++ b/.github/workflows/pre-release.yml
@@ -31,7 +31,7 @@ jobs:
           # - system: i686-windows
           #   target: i686-w64-mingw32
           #   os: ubuntu-latest
-          - system: x86_64-macos
+          - system: x86_64-macos-13
             target: x86_64-apple-darwin
             os: macos-13
           # - system: x86_64-linux
diff --git a/default.nix b/default.nix
index 78f1d72a..b94c7554 100644
--- a/default.nix
+++ b/default.nix
@@ -7,10 +7,10 @@ let
   systems = import ./systems.nix;
   system = systems.${target};
 
-  buildPackages = import (fetchTarball "https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz") { };
+  buildPackages = import (fetchTarball "https://github.com/soywod/nixpkgs/archive/master.tar.gz") { };
   inherit (buildPackages) stdenv binutils mktemp gnutar zip;
 
-  pkgs = import (fetchTarball "https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz") {
+  pkgs = import (fetchTarball "https://github.com/soywod/nixpkgs/archive/master.tar.gz") {
     crossSystem = {
       isStatic = true;
       config = target;