diff --git a/obs_tn/requirements.txt b/obs_tn/requirements.txt
index eddfaafea..c5e0ef8f6 100644
--- a/obs_tn/requirements.txt
+++ b/obs_tn/requirements.txt
@@ -6,7 +6,7 @@ futures==3.2.0
 markdown2==2.3.6
 pyparsing==2.1.10
 python-dateutil==2.3
-PyYAML==3.13
+PyYAML==5.1
 singledispatch==3.4.0.3
 six==1.11.0
 tornado==5.1.1