diff --git a/requirements.txt b/requirements.txt
index 3fb8626..9abd125 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,3 +14,4 @@ six==1.5.2
 uritemplate.py==0.3.0
 wsgiref==0.1.2
 urllib3>=1.26.5 # not directly required, pinned by Snyk to avoid a vulnerability
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability