diff --git a/nixos/hosts/nixos-osaka-vultr-01/default.nix b/nixos/hosts/nixos-osaka-vultr-01/default.nix
index c1b095ff..6ffd4ecb 100644
--- a/nixos/hosts/nixos-osaka-vultr-01/default.nix
+++ b/nixos/hosts/nixos-osaka-vultr-01/default.nix
@@ -8,7 +8,7 @@
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];
-  virtualization.hyprvGuest.enable = true;
+  virtualisation.hypervGuest.enable = true;
 
   networking.useDHCP = lib.mkDefault true;
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
@@ -16,12 +16,13 @@
   networking.hostName = "nixos-osaka-vultr-01";
 
   boot.loader.grub = {
-    #enableCryptodisk = true;
+    enableCryptodisk = true;
     enable = true;
-    #device = "/dev/vda";
-    #useOSProber = true;
+    device = "/dev/vda";
+    efiSupport = true;
+    efiInstallAsRemovable = true;
+    useOSProber = true;
   };
   
   networking.firewall.allowedTCPPorts = [ 22 ];
-  time.timezone = "Asia/Tokyo";
-}
+}
\ No newline at end of file