diff --git a/ch07/requirements.txt b/ch07/requirements.txt
index 95c6066..535ddb5 100644
--- a/ch07/requirements.txt
+++ b/ch07/requirements.txt
@@ -5,4 +5,4 @@ matplotlib==2.1.1
 scikit-learn==0.19.1
 pandas==0.22.0
 nltk==3.2.5
-Pillow==4.3.0
+Pillow==9.0.1
diff --git a/ch07/requirements_gpu.txt b/ch07/requirements_gpu.txt
index d3ef483..ef59cd1 100644
--- a/ch07/requirements_gpu.txt
+++ b/ch07/requirements_gpu.txt
@@ -5,4 +5,4 @@ matplotlib==2.1.1
 scikit-learn==0.19.1
 pandas==0.22.0
 nltk==3.2.5
-Pillow==4.3.0
+Pillow==9.0.1