diff --git a/{{cookiecutter.project_slug}}/requirements/base.txt b/{{cookiecutter.project_slug}}/requirements/base.txt
index 0ea58951..049d7b36 100644
--- a/{{cookiecutter.project_slug}}/requirements/base.txt
+++ b/{{cookiecutter.project_slug}}/requirements/base.txt
@@ -25,6 +25,7 @@ flower==0.9.5  # https://github.com/mher/flower
 {%- endif %}
 {%- if cookiecutter.use_async == 'y' %}
 uvicorn==0.12.1  # https://github.com/encode/uvicorn
+wsproto==0.15.0  # https://github.com/python-hyper/wsproto/
 {%- endif %}
 
 # Django