diff --git a/contrib/libcbor/doc/source/requirements.txt b/contrib/libcbor/doc/source/requirements.txt
index 461bb7e804d23..3412ade788183 100644
--- a/contrib/libcbor/doc/source/requirements.txt
+++ b/contrib/libcbor/doc/source/requirements.txt
@@ -19,7 +19,7 @@ port-for==0.3.1
 Pygments==2.6.1
 pyparsing==2.4.6
 pytz==2019.3
-PyYAML==5.3
+PyYAML==5.4
 requests==2.23.0
 six==1.14.0
 snowballstemmer==2.0.0