diff --git a/devrequirements.txt b/devrequirements.txt
index 1b90f87..e99a4ae 100644
--- a/devrequirements.txt
+++ b/devrequirements.txt
@@ -1,3 +1,3 @@
 matplotlib==1.4.1
-Pillow==2.5.1
+Pillow==9.0.1
 coveralls
\ No newline at end of file