diff --git a/pkgs/servers/mail/mailman/python.nix b/pkgs/servers/mail/mailman/python.nix
index 58256a961aba..be50e9be7e61 100644
--- a/pkgs/servers/mail/mailman/python.nix
+++ b/pkgs/servers/mail/mailman/python.nix
@@ -7,15 +7,6 @@ python3.override {
       alembic = super.alembic.overridePythonAttrs (oldAttrs: {
         doCheck = false;
       });
-      # Fixes `AssertionError: database connection isn't set to UTC`
-      psycopg2 = super.psycopg2.overridePythonAttrs (a: (rec {
-        version = "2.8.6";
-        src = super.fetchPypi {
-          inherit version;
-          inherit (a) pname;
-          sha256 = "fb23f6c71107c37fd667cb4ea363ddeb936b348bbd6449278eb92c189699f543";
-        };
-      }));
     })
     overlay;
 }