diff --git a/dune-project b/dune-project
index 5725f44..8bb20ad 100644
--- a/dune-project
+++ b/dune-project
@@ -14,5 +14,7 @@
  (synopsis "Metrics for Liquidsoap")
  (description "Generate graph from Liquidsoap metrics.")
  (depends
-  dune)
+   dune
+   yaml
+ )
 )
diff --git a/metrics.opam b/metrics.opam
index 895a5b5..53605d9 100644
--- a/metrics.opam
+++ b/metrics.opam
@@ -10,6 +10,7 @@ homepage: "https://github.com/savonet/metrics"
 bug-reports: "https://github.com/savonet/metrics/issues"
 depends: [
   "dune" {>= "2.9"}
+  "yaml"
   "odoc" {with-doc}
 ]
 build: [