diff --git a/dune-project b/dune-project
index 04e5191..143e34a 100644
--- a/dune-project
+++ b/dune-project
@@ -29,6 +29,7 @@ It supports parsing JSON5 to Yojson.Basic.t and Yojson.Safe.t types.")
   (depends
     (ocaml (>= 4.08))
     (sedlex (>= 2.5))
+    (yojson (= :version))
     (alcotest (and :with-test (>= 0.8.5)))))
 
 (package
diff --git a/yojson-five.opam b/yojson-five.opam
index 908b8e6..0fb6206 100644
--- a/yojson-five.opam
+++ b/yojson-five.opam
@@ -17,6 +17,7 @@ depends: [
   "dune" {>= "2.7"}
   "ocaml" {>= "4.08"}
   "sedlex" {>= "2.5"}
+  "yojson" {= version}
   "alcotest" {with-test & >= "0.8.5"}
   "odoc" {with-doc}
 ]