diff --git a/requirements/dev.in b/requirements/dev.in
index 263b3ef3716..fa936f8fd52 100644
--- a/requirements/dev.in
+++ b/requirements/dev.in
@@ -20,7 +20,7 @@ pytest-rerunfailures==14.0
 pytest-selenium==4.0.1
 responses==0.25.0
 ruff==0.4.7
-selenium==4.9.1  # Pinned to 4.9.1 until https://github.com/pytest-dev/pytest-selenium/issues/315 is resolved
+selenium==4.21.0  # Pinned to 4.9.1 until https://github.com/pytest-dev/pytest-selenium/issues/315 is resolved
 translate-toolkit==3.13.0
 wagtail-factories==4.2.1
 # Related to moz-l10n-lint, used in CI