diff --git a/requirements.txt b/requirements.txt
index 0a3dd71..d7d2aa1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,5 @@ dmr_utils3
 bitstring
 autobahn
 jinja2==2.11.3
+markupsafe==2.0.1
+