diff --git a/packaging/nominatim-db/pyproject.toml b/packaging/nominatim-db/pyproject.toml
index 80eec85f..6df9560a 100644
--- a/packaging/nominatim-db/pyproject.toml
+++ b/packaging/nominatim-db/pyproject.toml
@@ -15,7 +15,7 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 dependencies = [
-    "psycopg",
+    "psycopg<3.3",
     "python-dotenv",
     "jinja2",
     "pyYAML>=5.1",