diff --git a/lib/default.nix b/lib/default.nix
index f6f3989..fd24232 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -225,6 +225,7 @@ in rec {
       pkgs.nixfmt
       pkgs.nodePackages.prettier
       pkgs.stylua
+      pkgs.yamlfmt
 
       # Tools
       hadolint
@@ -235,6 +236,7 @@ in rec {
       pkgs.html-tidy
       pkgs.proselint
       pkgs.shellcheck
+      pkgs.yamllint
     ];
 
   mkExtraConfig = ''