diff --git a/architectures/chainer/requirements.txt b/architectures/chainer/requirements.txt
index 7ee15c2..3b40150 100644
--- a/architectures/chainer/requirements.txt
+++ b/architectures/chainer/requirements.txt
@@ -9,7 +9,7 @@ idna==2.5
 nose==1.3.7
 numpy==1.13.1
 olefile==0.44
-Pillow==4.2.1
+Pillow==9.3.0
 protobuf==3.3.0
 pyglet==1.2.4
 PyOpenGL==3.1.0