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..77cdc9e
--- a/books/zero_to_deep_learning/requirements.txt
+++ b/books/zero_to_deep_learning/requirements.txt
@@ -68,7 +68,7 @@ Send2Trash==1.5.0
 simplegeneric==0.8.1
 six==1.11.0
 tensorboard==1.9.0
-tensorflow==1.15.2
+tensorflow==2.6.4
 termcolor==1.1.0
 terminado==0.8.1
 testpath==0.3.1