diff --git a/overlays/default.nix b/overlays/default.nix
index 2113d41..9ef3e24 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -22,6 +22,7 @@
         apscheduler
         mypy
         polars
+        psycopg
         pyfakefs
         pytest
         pytest-cov