diff --git a/requirements.txt b/requirements.txt
index c9969bf..030d2f1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,7 +48,7 @@ python-dateutil==2.8.0
 python3-openid==3.1.0
 pytz==2019.1
 PyWavelets==1.0.3
-PyYAML==5.1
+PyYAML==5.4
 repoze.sendmail==4.4.1
 requests==2.21.0
 requests-oauthlib==1.3.0