diff --git a/sasa.opam b/sasa.opam
index 1287e0d39b0d0e3b7e53ff0a2307b49c56265def..c901af2e58fbeed2c42e38699f420e39546ab832 100644
--- a/sasa.opam
+++ b/sasa.opam
@@ -20,6 +20,7 @@ depends: [
   "ocamlfind"
   "dune" { >= "2.0" }
   "ocamlgraph"
+  "conf-graphviz"
   "lutils"
   "psq"
   "functory"