diff --git a/tox.ini b/tox.ini
index 832cee8..cf69ec3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -54,6 +54,7 @@ deps:
 	pytest-freezegun
 	xmlschema<1.1
 	enum34<=1.1.6
+	psycopg2<2.9
 	psycopg2-binary<2.9
 	black: pre-commit
 commands =