diff --git a/pkgs/development/ocaml-modules/ocsigen-start/default.nix b/pkgs/development/ocaml-modules/ocsigen-start/default.nix
index 4f439733740..1df74b9036d 100644
--- a/pkgs/development/ocaml-modules/ocsigen-start/default.nix
+++ b/pkgs/development/ocaml-modules/ocsigen-start/default.nix
@@ -2,13 +2,15 @@
 , cohttp-lwt-unix, eliom
 , resource-pooling
 , ocamlnet
+, ocsigen-ppx-rpc
 }:
 
 stdenv.mkDerivation rec {
   pname = "ocaml${ocaml.version}-ocsigen-start";
-  version = "4.5.0";
+  version = "6.0.1";
 
   nativeBuildInputs = [ ocaml findlib eliom ];
+  buildInputs = [ ocsigen-ppx-rpc ];
   propagatedBuildInputs = [ pgocaml_ppx safepass ocsigen-toolkit yojson resource-pooling cohttp-lwt-unix ocamlnet ];
 
   strictDeps = true;
@@ -19,7 +21,7 @@ stdenv.mkDerivation rec {
     owner = "ocsigen";
     repo = "ocsigen-start";
     rev = version;
-    sha256 = "sha256:1n94r8rbkzxbgcz5w135n6f2cwpc91bdvf7yslcdq4cn713rncmq";
+    sha256 = "sha256:097bjaxvb1canilmqr8ay3ihig2msq7z8mi0g0rnbciikj1jsrym";
   };
 
   preInstall = ''