diff --git a/systems/jibril/default.nix b/systems/jibril/default.nix
index 8024813..5a72991 100644
--- a/systems/jibril/default.nix
+++ b/systems/jibril/default.nix
@@ -5,7 +5,6 @@
     ./hardware.nix
   ];
   networking.hostName = "jibril";
-  nix.package = pkgs.nixUnstable;
   nixpkgs.config.allowUnfree = true;
   system.stateVersion = "23.05";
 
diff --git a/systems/onizuka/default.nix b/systems/onizuka/default.nix
index 15a3956..7741830 100644
--- a/systems/onizuka/default.nix
+++ b/systems/onizuka/default.nix
@@ -5,7 +5,6 @@
     ./hardware.nix
   ];
   networking.hostName = "onizuka";
-  nix.package = pkgs.nixUnstable;
   nixpkgs.config.allowUnfree = true;
   system.stateVersion = "23.05";