diff --git a/requirements.txt b/requirements.txt
index 9dc2f96..d30d681 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ joblib==0.12.5
 docker==3.6.0
 Flask==1.0.2
 flask-cors==3.0.6
+markupsafe==1.1.1
 PyYAML==3.13
 defusedxml==0.5.0
 waitress==1.4.3