diff --git a/requirements.txt b/requirements.txt
index bdb6a5a..4f0b170 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ gym==0.10.5
 imageio==2.3.0
 matplotlib==2.2.2
 numpy==1.14.5
-Pillow==6.2.0
+Pillow==9.0.1
 scikit-image==0.14.0
 scikit-learn==0.19.1
 scipy==1.1.0