diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
index 701604c8710a..4921f579c418 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
@@ -4,23 +4,36 @@
 , ocaml-syntax-shims
 , yojson
 , result
-, fetchzip
+, fetchurl
 , lib
+, ocaml
 }:
 
+let params =
+  if lib.versionAtLeast ocaml.version "4.12"
+  then {
+    version = "1.5.0";
+    sha256 = "0g82m3jrp4s0m3fn9xmm8khrb3acccq8ns9p62bqa09pjd4vgdk2";
+  } else {
+    version = "1.4.1";
+    sha256 = "1ssyazc0yrdng98cypwa9m3nzfisdzpp7hqnx684rqj8f0g3gs6f";
+  }
+; in
 
 buildDunePackage rec {
   pname = "jsonrpc";
-  version = "1.4.1";
-  src = fetchzip {
+  inherit (params) version;
+  src = fetchurl {
     url = "https://github.com/ocaml/ocaml-lsp/releases/download/${version}/jsonrpc-${version}.tbz";
-    sha256 = "0hzpw17qfhb0cxgwah1fv4k300r363dy1kv0977anl44dlanx1v5";
+    inherit (params) sha256;
   };
 
   useDune2 = true;
   minimumOCamlVersion = "4.06";
 
-  buildInputs = [ yojson stdlib-shims ocaml-syntax-shims ppx_yojson_conv_lib result ];
+  buildInputs = [ yojson stdlib-shims ocaml-syntax-shims ];
+
+  propagatedBuildInputs = [ ppx_yojson_conv_lib result ];
 
   meta = with lib; {
     description = "Jsonrpc protocol implementation in OCaml";