diff --git a/contrib/mmts/tests2/requirements.txt b/contrib/mmts/tests2/requirements.txt
index c8a4f3ecf2..a51acc2a1f 100644
--- a/contrib/mmts/tests2/requirements.txt
+++ b/contrib/mmts/tests2/requirements.txt
@@ -8,7 +8,7 @@ dockerpty==0.4.1
 docopt==0.6.2
 jsonschema==2.6.0
 psycopg2==2.7.3.1
-PyYAML==3.12
+PyYAML==5.4
 requests==2.11.1
 six==1.11.0
 texttable==0.9.1