diff --git a/smm4h/requirements.txt b/smm4h/requirements.txt
index 45171f1..4812b20 100644
--- a/smm4h/requirements.txt
+++ b/smm4h/requirements.txt
@@ -85,7 +85,7 @@ pyrsistent==0.15.2
 python-dateutil==2.6.1
 python-Levenshtein==0.12.0
 pytz==2017.3
-PyYAML==5.3.1
+PyYAML==5.4
 pyzmq==17.0.0
 qtconsole==4.3.1
 regex==2017.4.5