diff --git a/tox.ini b/tox.ini
index 150e1250ec..7fc043fc10 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,6 +31,7 @@ deps =
     django51: Django==5.1.*
     djangomain: git+https://github.com/django/django.git@main#egg=django
     python3-saml>=1.15.0,<2.0.0
+    pyyaml>=6.0.2
 extras =
     mfa
     openid