diff --git a/requirements.txt b/requirements.txt
index 286ca2a7e..364a6450c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,7 +71,7 @@ govuk-bank-holidays==0.8
     #   notifications-utils
 git+https://github.com/alphagov/govuk-frontend-jinja.git@v0.5.8-alpha#egg=govuk-frontend-jinja==0.5.8-alpha
     # via -r requirements.in
-greenlet==0.4.17
+greenlet==1.0.0
     # via eventlet
 gunicorn==20.0.4
     # via -r requirements.in