⬆️ bump versions

flake.nix

@@ -2,7 +2,7 @@
   description = "walkah.net";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/release-22.11";
+    nixpkgs.url = "github:nixos/nixpkgs/release-23.05";
     flake-utils.url = "github:numtide/flake-utils";
 
     flake-compat = {
@@ -11,14 +11,14 @@
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, ... }:
+  outputs = { nixpkgs, flake-utils, ... }:
     flake-utils.lib.eachDefaultSystem
       (system:
         let pkgs = nixpkgs.legacyPackages.${system};
         in
         {
           devShells.default = pkgs.mkShell {
-            buildInputs = with pkgs; [ ruby nodejs ];
+            buildInputs = with pkgs; [ libyaml nodejs ruby ];
             shellHook = ''
               mkdir -p .gems