diff --git a/dev-requirements.txt b/dev-requirements.txt
index d88e9d4b..0e80947f 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -8,3 +8,4 @@ mock
 # update this for ckanext-harvest
 pyOpenSSL>=23.0.0
 pytest-ckan
+selenium<4.10