diff --git a/Rule-Based Extraction Method/requirements.txt b/Rule-Based Extraction Method/requirements.txt
index 37117b7..6787663 100644
--- a/Rule-Based Extraction Method/requirements.txt	
+++ b/Rule-Based Extraction Method/requirements.txt	
@@ -72,7 +72,7 @@ pystan==2.18.1.0
 python-dateutil==2.8.0
 pytz==2018.9
 pyxform==0.12.2
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==18.0.0
 qtconsole==4.4.3
 requests==2.21.0