Ensure that the Flask-Security-Too version should be less than 4.0.0

requirements.txt

@@ -37,7 +37,7 @@ psutil>=5.7.0
 psycopg2>=2.8
 python-dateutil>=2.8.0
 SQLAlchemy>=1.3.13
-Flask-Security-Too>=3.0.0
+Flask-Security-Too>=3.0.0,<4.0.0
 bcrypt<=3.1.7
 cryptography<=3.0
 sshtunnel>=0.1.5