diff --git a/requirements.txt b/requirements.txt
index c4f35f2..73e56b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ idna==2.6
 Markdown==2.6.9
 numpy==1.13.3
 olefile==0.44
-Pillow==4.2.1
+Pillow==6.2.0
 psycopg2==2.7.3.1
 pystan==2.17.0.0
 pytz==2017.2