diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 931a92c..de1092d
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ Pygments==2.5.2
 pyparsing==2.4.6
 python-dateutil==2.8.1
 PyWavelets==1.1.1
-PyYAML==5.3
+PyYAML==5.4
 pyzmq==19.0.0
 requests==2.23.0
 requests-oauthlib==1.3.0