diff --git a/morphology-similarity/requirements.txt b/morphology-similarity/requirements.txt
index 83509ea..d8fc66c 100644
--- a/morphology-similarity/requirements.txt
+++ b/morphology-similarity/requirements.txt
@@ -104,7 +104,7 @@ python-dotenv==0.10.5
 pytz==2019.3
 PyWavelets==1.1.1
 pyxdg==0.25
-PyYAML==5.2
+PyYAML==5.4
 pyzmq==18.1.1
 qtconsole==4.6.0
 requests==2.22.0