diff --git a/requirements.txt b/requirements.txt
index 8754987..6b2623c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ slackclient==1.3.0
 soupsieve==1.8
 uritemplate==3.0.0
 urllib3==1.26.5
-waitress==1.4.3
+waitress==2.1.1
 WebOb==1.8.5
 websocket-client==0.54.0
 WebTest==2.0.33