diff --git a/pyproject.toml b/pyproject.toml
index 5c77de89acdf4f5643742b2450e2a057a1829f4f..0ef5c74606ac81530d057a63994cb114ea86bd90 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,7 @@ dependencies = [
     'psycopg2-binary >= 2.9.5, < 3.0',
     'pyvo >= 1.4,  < 2.0',
     'importlib-metadata >= 0.12; python_version < "3.8"',
+    'cx-Oracle >= 8.0'
 ]
 dynamic = ["version"]