diff --git a/tox.ini b/tox.ini
index dae899754..88708d47b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -85,8 +85,8 @@ basepython = python3
 usedevelop = True
 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