diff --git a/books/zero_to_deep_learning/requirements.txt b/books/zero_to_deep_learning/requirements.txt
old mode 100755
new mode 100644
index b5ad23a..fad6476
--- a/books/zero_to_deep_learning/requirements.txt
+++ b/books/zero_to_deep_learning/requirements.txt
@@ -50,7 +50,7 @@ Pillow==6.2.0
 pluggy==0.6.0
 prometheus-client==0.3.0
 prompt-toolkit==1.0.15
-protobuf==3.6.0
+protobuf==3.18.3
 ptyprocess==0.6.0
 py==1.5.4
 Pygments==2.2.0