diff --git a/nixos/hosts/osaka-vultr-01/default.nix b/nixos/hosts/osaka-vultr-01/default.nix
index c2076d27..ea29cd5b 100644
--- a/nixos/hosts/osaka-vultr-01/default.nix
+++ b/nixos/hosts/osaka-vultr-01/default.nix
@@ -17,15 +17,6 @@
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   time.timeZone = "Asia/Tokyo";
   networking.hostName = "osaka-vultr-01";
-
-  boot.loader.grub = {
-    enableCryptodisk = true;
-    enable = true;
-    device = "/dev/vda";
-    efiSupport = true;
-    efiInstallAsRemovable = true;
-    useOSProber = true;
-  };
   
   networking.firewall.allowedTCPPorts = [ 22 ];
 }
\ No newline at end of file