diff --git a/ch04/requirements.txt b/ch04/requirements.txt
index 0d84467..f6fff9b 100644
--- a/ch04/requirements.txt
+++ b/ch04/requirements.txt
@@ -1,5 +1,5 @@
 keras==2.1.2
-tensorflow==1.8.0
+tensorflow==2.9.3
 h5py==2.7.1
 matplotlib==2.1.1
 PIllow==5.1.0