diff --git a/pkgs/development/tools/ocaml/merlin/default.nix b/pkgs/development/tools/ocaml/merlin/default.nix
index ce168084f2c6..1c9b549d6120 100644
--- a/pkgs/development/tools/ocaml/merlin/default.nix
+++ b/pkgs/development/tools/ocaml/merlin/default.nix
@@ -3,8 +3,14 @@
 
 buildDunePackage rec {
   pname = "merlin";
+  version = "3.4.2";
 
-  inherit (dot-merlin-reader) src version useDune2;
+  src = fetchurl {
+    url = "https://github.com/ocaml/merlin/releases/download/v${version}/merlin-v${version}.tbz";
+    sha256 = "e1b7b897b11119d92995c558530149fd07bd67a4aaf140f55f3c4ffb5e882a81";
+  };
+
+  useDune2 = true;
 
   minimumOCamlVersion = "4.02.3";
 
diff --git a/pkgs/development/tools/ocaml/merlin/dot-merlin-reader.nix b/pkgs/development/tools/ocaml/merlin/dot-merlin-reader.nix
index b3b737760588..894fe6f75ae9 100644
--- a/pkgs/development/tools/ocaml/merlin/dot-merlin-reader.nix
+++ b/pkgs/development/tools/ocaml/merlin/dot-merlin-reader.nix
@@ -2,15 +2,15 @@
 
 buildDunePackage rec {
   pname = "dot-merlin-reader";
-  version = "3.4.2";
+  version = "4.1";
 
   useDune2 = true;
 
-  minimumOCamlVersion = "4.02.1";
+  minimumOCamlVersion = "4.06";
 
   src = fetchurl {
-    url = "https://github.com/ocaml/merlin/releases/download/v${version}/merlin-v${version}.tbz";
-    sha256 = "109ai1ggnkrwbzsl1wdalikvs1zx940m6n65jllxj68in6bvidz1";
+    url = "https://github.com/ocaml/merlin/releases/download/v${version}/dot-merlin-reader-v${version}.tbz";
+    sha256 = "14a36d6fb8646a5df4530420a7861722f1a4ee04753717947305e3676031e7cd";
   };
 
   buildInputs = [ yojson csexp result ];