diff --git a/capstone/requirements.txt b/capstone/requirements.txt
index ed86e375..cfef732b 100644
--- a/capstone/requirements.txt
+++ b/capstone/requirements.txt
@@ -55,7 +55,7 @@ pyparsing==2.3.1
 pyrsistent==0.14.11
 python-dateutil==2.8.0
 pytz==2018.9
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.4.3
 scikit-learn==0.20.3