diff --git a/devenv.nix b/devenv.nix
index 6121efa..9eed9e2 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -7,6 +7,7 @@
       pkgs.git
       pkgs.nodejs_22
       pkgs.corepack_22
+      pkgs.prettier
       pkgs.typescript-language-server
   ];
 }