diff --git a/dune-project b/dune-project
index 651c039bc2..2a672e0a84 100644
--- a/dune-project
+++ b/dune-project
@@ -103,11 +103,13 @@
    dune
    (alcotest :with-test)
    (fmt :with-test)
+   ppx_deriving_yojson
    re
    uri
    (uuid :with-test)
    (xapi-log (= :version))
    (xapi-stdext-threads (= :version))
+   yojson
   )
   (synopsis "Allows to instrument code to generate tracing information")
   (description "This library provides modules to allow gathering runtime traces.")
diff --git a/xapi-tracing.opam b/xapi-tracing.opam
index b9cac8ba0d..f5c0df48bf 100644
--- a/xapi-tracing.opam
+++ b/xapi-tracing.opam
@@ -13,11 +13,13 @@ depends: [
   "dune" {>= "3.15"}
   "alcotest" {with-test}
   "fmt" {with-test}
+  "ppx_deriving_yojson"
   "re"
   "uri"
   "uuid" {with-test}
   "xapi-log" {= version}
   "xapi-stdext-threads" {= version}
+  "yojson"
   "odoc" {with-doc}
 ]
 build: [