diff --git a/requirements.txt b/requirements.txt
index 6ab8580..11a5df2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ soupsieve            == 2.0
 translationstring    == 1.3
 urllib3              == 1.25.9
 venusian             == 3.0.0
-waitress             == 1.4.3
+waitress             == 2.1.1
 wcwidth              == 0.1.9
 WebOb                == 1.8.6
 WebTest              == 2.0.34