diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index ad26b229a..6a101e223 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -24,6 +24,7 @@ rtyaml==0.0.5
 python-magic==0.4.15
 unipath==1.1
 WeasyPrint==44
+Pillow==5.1.0
 gunicorn==19.9.0
 
 textract==1.5.0