diff --git a/flake.nix b/flake.nix
index 07fa9b8..a33b4fc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,9 @@
             python312
             python312Packages.virtualenv
             python312Packages.pip
+
+            graphviz
+            d2
           ];
         };
       });