diff --git a/pyproject.toml b/pyproject.toml
index d2b5604..eb0bae3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,6 +57,7 @@ dev = [
     "pynput",
     "textual",
     "websockets",
+    "graphviz",
 ]
 
 [tool.uv.workspace]