diff --git a/pyproject.toml b/pyproject.toml
index 72bb2593..ccba35e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -180,6 +180,7 @@ authorized_licenses = [
 
 [tool.liccheck.authorized_packages]
 noggin-messages = ">=0.0.1"
+twisted = "23.8.0"
 
 [tool.isort]
 profile = "black"
diff --git a/tox.ini b/tox.ini
index 247c27a7..8b3cf5ab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,6 +56,8 @@ commands =
 # Make tox's poetry executable available for the run-liccheck script
 setenv =
     PATH={env:PATH}{:}{env:TOX_WORK_DIR}{/}.tox{/}bin
+allowlist_externals =
+    {toxinidir}/devel/run-liccheck.sh
 commands =
     {toxinidir}/devel/run-liccheck.sh