diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
index 13ae64292ec7..602f5eb77fe7 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
@@ -1,4 +1,4 @@
-{ buildDunePackage, jsonrpc, lsp, re, makeWrapper, dot-merlin-reader }:
+{ lib, buildDunePackage, jsonrpc, lsp, re, makeWrapper, dot-merlin-reader, spawn }:
 
 buildDunePackage {
   pname = "ocaml-lsp-server";
@@ -7,7 +7,8 @@ buildDunePackage {
 
   inherit (lsp) preBuild;
 
-  buildInputs = lsp.buildInputs ++ [ lsp re ];
+  buildInputs = lsp.buildInputs ++ [ lsp re ]
+  ++ lib.optional (lib.versionAtLeast jsonrpc.version "1.9") spawn;
 
   nativeBuildInputs = [ makeWrapper ];
 
diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
index 004b7854107e..26deb2f05970 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
@@ -10,10 +10,14 @@
 }:
 
 let params =
-  if lib.versionAtLeast ocaml.version "4.12"
+  if lib.versionAtLeast ocaml.version "4.13"
   then {
-    version = "1.8.3";
-    sha256 = "sha256-WO9ap78XZxJCi04LEBX+r21nfL2UdPiCLRMrJSI7FOk=";
+    version = "1.9.1";
+    sha256 = "sha256:1vnwdpjppihprc8q2i5zcqq7vp67255jclg90ldfvwafgljxn76g";
+  } else if lib.versionAtLeast ocaml.version "4.12"
+  then {
+    version = "1.9.0";
+    sha256 = "sha256:1ac44n6g3rf84gvhcca545avgf9vpkwkkkm0s8ipshfhp4g4jikh";
   } else {
     version = "1.4.1";
     sha256 = "1ssyazc0yrdng98cypwa9m3nzfisdzpp7hqnx684rqj8f0g3gs6f";
@@ -29,7 +33,7 @@ buildDunePackage rec {
   };
 
   useDune2 = true;
-  minimumOCamlVersion = "4.06";
+  minimalOCamlVersion = "4.06";
 
   buildInputs =
     if lib.versionAtLeast version "1.7.0" then