diff --git a/requirements.txt b/requirements.txt
index 25ffffb..0479bd3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ MarkupSafe==1.1.1
 num2words==0.5.10
 Pint==0.9
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.4
 requests==2.22.0
 syllables==0.1.0
 urllib3==1.25.6