diff --git a/requirements.txt b/requirements.txt
index 394c610..1249429 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -60,7 +60,7 @@ sphinxcontrib-serializinghtml==1.1.3
 typed-ast==1.4.1
 typing-extensions==3.7.4.1
 urllib3==1.25.8
-waitress==1.4.2
+waitress==1.4.3
 wcwidth==0.1.8
 WebOb==1.8.6
 WebTest==2.0.33