diff --git a/pyproject.toml b/pyproject.toml
index ae534e4..d485338 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,7 @@ dependencies = [
     "python-multipart",
     "reader",
     "sentry-sdk[fastapi]",
+    "sgmllib3k",
     "tldextract",
     "uvicorn",
 ]