diff --git a/hosts/dionach.nix b/hosts/dionach.nix
index ead8df2..267c39a 100644
--- a/hosts/dionach.nix
+++ b/hosts/dionach.nix
@@ -80,6 +80,7 @@
     google-authenticator          # 2FA
     google-chrome                 # A freeware web browser developed by Google
     googleearth                   # A world sphere viewer
+    graphviz                      # Graph visualization tools
     gvfs
     imagemagick
     inetutils                     # Common network utilies