diff --git a/setup.py b/setup.py
index 604b6925..3753f824 100644
--- a/setup.py
+++ b/setup.py
@@ -29,6 +29,7 @@
             "jsonschema",
         ],
         "federation-activitypub-bovine": [
+            "tomli-w",
             "aiohttp",
             "bovine",
             "bovine-store",