diff --git a/atramhasis-requirements-dev.txt b/atramhasis-requirements-dev.txt
index f2b5ad7..955a1c3 100644
--- a/atramhasis-requirements-dev.txt
+++ b/atramhasis-requirements-dev.txt
@@ -18,7 +18,7 @@ sphinxcontrib-httpdomain==1.7.0
 pygments==2.3.1
 
 # waitress
-waitress==1.2.0
+waitress==2.1.1
 
 # Linting
 flake8==3.7.7