diff --git a/requirements.txt b/requirements.txt
index df6ea32..55a0e68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,5 +26,5 @@ scikit-learn==0.21.3
 scipy==1.3.3
 six==1.13.0
 urllib3==1.25.7
-waitress==1.3.1
+waitress==2.1.1
 Werkzeug==0.16.0