diff --git a/kmeans_mapreduce/requirements.txt b/kmeans_mapreduce/requirements.txt
index 35c391c..08a5457 100644
--- a/kmeans_mapreduce/requirements.txt
+++ b/kmeans_mapreduce/requirements.txt
@@ -1,6 +1,6 @@
 matplotlib==1.5.3
 numpy==1.11.3
 pandas==0.19.2
-Pillow==4.1.0
+Pillow==9.0.1
 mrjob==0.5.9
 scikit_learn==0.18.1