diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 0486c8d..961ccda
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ tensorflow_gpu==1.0.1
 matplotlib==2.0.2
 h5py==2.7.0
 numpy==1.13.1
-PyYAML==3.12
+PyYAML==5.4