diff --git a/requirements.txt b/requirements.txt
index dd76a671..158bdb60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ translationstring==1.3
 Unidecode==1.0.23
 urllib3==1.24.1
 venusian==1.2.0
-waitress==1.2.1
+waitress==2.1.1
 WebOb==1.8.5
 WebTest==2.0.33
 -e git+https://github.com/scieloorg/xylose.git@1.35.8#egg=xylose