diff --git a/requirements.txt b/requirements.txt
index abefb90..8a38bc2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ numpy==1.17
 pandas==0.25
 bert-tensorflow==1.0.1
 ming==0.9.1
-waitress==1.4.1
+waitress==2.1.1
 https://github.com/huridocs/classification-utils/archive/master.zip#egg=classification-utils