diff --git a/ch03/requirements.txt b/ch03/requirements.txt
index 4476e5b..04608a7 100644
--- a/ch03/requirements.txt
+++ b/ch03/requirements.txt
@@ -1,5 +1,5 @@
 keras==2.1.6
 tensorflow==1.8.0
 h5py==2.7.1
-Pillow==4.3.0
+Pillow==8.3.2
 opencv-python==3.3.1.11
diff --git a/ch03/requirements_gpu.txt b/ch03/requirements_gpu.txt
index 9eb1fae..9e55225 100644
--- a/ch03/requirements_gpu.txt
+++ b/ch03/requirements_gpu.txt
@@ -1,5 +1,5 @@
 keras==2.1.6
 tensorflow-gpu==1.8.0
 h5py==2.7.1
-Pillow==4.3.0
+Pillow==8.3.2
 opencv-python==3.3.1.11