diff --git a/flake.nix b/flake.nix
index 35156c0ac8..e4470b474a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -187,6 +187,7 @@
             cargo-watch
             nsjail
             sccache
+            pg_activity
           ]);
           packages = [
             (pkgs.writeScriptBin "wm-caddy" ''