diff --git a/requirements.txt b/requirements.txt
index 52575d113..66d1e99b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -80,7 +80,7 @@ govuk-country-register==0.5.0
     # via digitalmarketplace-utils
 greenlet==1.0.0
     # via sqlalchemy
-idna==2.9
+idna==3.7
     # via requests
 itsdangerous==1.1.0
     # via