diff --git a/tox.ini b/tox.ini
index 3fd64ff..d08d594 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,6 +21,8 @@ deps=
     django-31: django>=3.1,<3.2
     django-32: django>=3.2,<4.0
     django-40: django>=4.0,<4.1
+    # Add mistune to dependencies
+    mistune>=3.0.0
 
 [testenv:coverage_setup]
 skip_install = True