diff --git a/package-requirements.txt b/package-requirements.txt
index c2961f2..f6c993c 100644
--- a/package-requirements.txt
+++ b/package-requirements.txt
@@ -43,7 +43,7 @@ mccabe==0.4.0
 pep257==0.7.0
 pep8==1.7.0
 pep8-naming==0.3.3
-Pillow==3.3.0
+Pillow==9.0.0
 primer3-py==0.5.0
 psycopg2==2.6.1
 py==1.4.31