diff --git a/shells/ruby.nix b/shells/ruby.nix
index b3941ab..8a98ab6 100644
--- a/shells/ruby.nix
+++ b/shells/ruby.nix
@@ -1,5 +1,6 @@
 { pkgs }: pkgs.mkShell {
   buildInputs = with pkgs; [
     ruby_3_2
+    postgresql_15
   ];
 }