diff --git a/pyproject.toml b/pyproject.toml
index d1cc257..6b2913d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ maintainer-email = "madsmtm@gmail.com"
 home-page = "https://github.com/carpedm20/fbchat/"
 requires = [
     "aenum",
+    "attrs",
     "requests",
     "beautifulsoup4",
 ]