diff --git a/setup.py b/setup.py
index 562d374..1117946 100644
--- a/setup.py
+++ b/setup.py
@@ -159,6 +159,7 @@ setup(
         'djangorestframework>=3.4, <3.10',
         'dnspython',
         'lxml',
+        'num2words',
     ],
     zip_safe=False,
     cmdclass={
diff --git a/tox.ini b/tox.ini
index a1b5096..832cee8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -55,7 +55,6 @@ deps:
 	xmlschema<1.1
 	enum34<=1.1.6
 	psycopg2-binary<2.9
-	num2words
 	black: pre-commit
 commands =
 	./getlasso3.sh