diff --git a/dune-project b/dune-project
index 8249f61..b043158 100644
--- a/dune-project
+++ b/dune-project
@@ -6,8 +6,6 @@
 
 (generate_opam_files true)
 
-(authors "glennsl" "Andrey Popp")
-
 (maintainers
  "Antonio Nuno Monteiro <anmonteiro@gmail.com>"
  "Javier Chávarri <javier.chavarri@gmail.com>")
@@ -23,6 +21,7 @@
 
 (package
  (name melange-json)
+ (authors "glennsl" "Andrey Popp")
  (synopsis "Compositional JSON encode/decode library and PPX for Melange")
  (description
   "Provides tools for converting JSON to typed OCaml values in Melange. It includes custom encoders, decoders, and a PPX for automating these conversions.")
@@ -42,11 +41,14 @@
 
 (package
  (name melange-json-native)
+ (authors "Andrey Popp")
  (synopsis "Compositional JSON encode/decode PPX for OCaml")
  (description
   "A PPX for OCaml that automates encoding and decoding JSON into typed values. It supports custom encoders and decoders, and integrates with Yojson")
  (depends
-  ocaml
-  ppxlib
+  (ocaml
+   (>= "4.12"))
+  (ppxlib
+   (>= "0.29.0"))
   (yojson
    (>= "1.6.0"))))
diff --git a/melange-json-native.opam b/melange-json-native.opam
index dba7a3f..3cbe90b 100644
--- a/melange-json-native.opam
+++ b/melange-json-native.opam
@@ -7,14 +7,14 @@ maintainer: [
   "Antonio Nuno Monteiro <anmonteiro@gmail.com>"
   "Javier Chávarri <javier.chavarri@gmail.com>"
 ]
-authors: ["glennsl" "Andrey Popp"]
+authors: ["Andrey Popp"]
 license: ["LGPL-3.0-only" "MPL-2.0"]
 homepage: "https://github.com/melange-community/melange-json/"
 bug-reports: "https://github.com/melange-community/melange-json/issues"
 depends: [
   "dune" {>= "3.9"}
-  "ocaml"
-  "ppxlib"
+  "ocaml" {>= "4.12"}
+  "ppxlib" {>= "0.29.0"}
   "yojson" {>= "1.6.0"}
   "odoc" {with-doc}
 ]