diff --git a/handson-ml-master/requirements.txt b/handson-ml-master/requirements.txt
old mode 100755
new mode 100644
index 7df1ca3..9ceea23
--- a/handson-ml-master/requirements.txt
+++ b/handson-ml-master/requirements.txt
@@ -30,7 +30,7 @@ psutil==5.3.1
 scikit-learn==0.19.0
 scipy==0.19.1
 sympy==1.1.1
-tensorflow==1.3.0
+tensorflow==1.15.0
 
 # Optional: OpenAI gym is only needed for the Reinforcement Learning chapter.
 # There are a few dependencies you need to install first, check out: