Add the twitter-color-emoji font
diff --git a/src/system.nix b/src/system.nix
index f1b2f37..c99c401 100644
--- a/src/system.nix
+++ b/src/system.nix
@@ -313,6 +313,7 @@
       roboto
       roboto-mono
       roboto-slab
+      twitter-color-emoji
       twemoji-color-font
       ubuntu_font_family
     ];