diff --git a/tox.ini b/tox.ini
index dae899754..66ce3f24c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -87,6 +87,8 @@ deps =
     -r{toxinidir}/doc/en/requirements.txt
     # https://github.com/twisted/towncrier/issues/340
     towncrier<21.3.0
+allowlist_externals =
+  git
 commands =
     # Retrieve possibly missing commits:
     -git fetch --unshallow