diff --git a/tox.ini b/tox.ini
index d7ba4f74..e8596849 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,6 +17,9 @@ setenv =
     postgresql-psycopg3: PGUSER=postgres
     postgresql-psycopg3: PGPASSWORD=postgres
     postgresql-contenttypes: USE_CONTENTTYPES=True
+    postgresql-contenttypes: TEST_DB=postgresql
+    postgresql-contenttypes: PGUSER=postgres
+    postgresql-contenttypes: PGPASSWORD=postgres
     sqlite: TEST_DB=sqlite
     sqlite: USE_TZ=True
 deps =
@@ -28,7 +31,8 @@ deps =
     django50: Django>=5.0,<5.1
     django51: Django>=5.1,<5.2
     postgresql: psycopg2-binary
-    postgresql-psycopg3: psycopg[binary]
+    postgresql-psycopg3: psycopg
+    postgresql-contenttypes: psycopg
 commands =
     python \
         -m coverage run \