diff --git a/tox.ini b/tox.ini
index 771c5de..55a8978 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,7 @@ deps =
     djangorestframework~=3.12
     django-rest-polymorphic~=0.1
     phonenumbers~=8.9.10
+    PyPDF3~=1.0.2
     python-magic==0.4.18
     whoosh~=2.7
 commands =