diff --git a/requirements.txt b/requirements.txt
index 7559491ac3..3da37476d4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 # Evennia dependencies
 
 # general
+attrs >= 19.2.0
 django >= 2.2.5, < 2.3
 twisted >= 19.2.1, < 20.0.0
 pytz