diff --git a/apps.toml b/apps.toml
index b3ed8ab4..b966e87d 100644
--- a/apps.toml
+++ b/apps.toml
@@ -1514,6 +1514,7 @@ url = "https://github.com/YunoHost-Apps/h5ai_ynh"
 
 [halcyon]
 added_date = 1674232499 # 2023/01/20
+antifeatures = [ "bad-security-reputation", "deprecated-software" ]
 category = "social_media"
 level = 6
 potential_alternative_to = [ "X" ]