diff --git a/instances/sif/hm.nix b/instances/sif/hm.nix
index 161acfa..4529aca 100644
--- a/instances/sif/hm.nix
+++ b/instances/sif/hm.nix
@@ -42,6 +42,7 @@
         # heroic
         jellyfin-tui
         openvpn
+        mattermost-desktop
         p7zip
         pavucontrol
         procps