diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
index 9e512e35f304..d9a21225cbb1 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/default.nix
@@ -9,6 +9,7 @@
 , dot-merlin-reader
 , spawn
 , ocamlc-loc
+, merlin
 , merlin-lib
 , astring
 , camlp-streams
@@ -25,6 +26,22 @@ let lsp_v =
 
 let lsp = lsp_v; in
 
+# Use merlin < 4.17 for OCaml < 5.2
+let merlin-lib_v =
+  if lib.versions.majorMinor ocaml.version == "4.14"
+  then merlin-lib.override {
+    merlin = merlin.override {
+      version = "4.16-414";
+    };
+  } else if lib.versions.majorMinor ocaml.version == "5.1"
+  then merlin-lib.override {
+    merlin = merlin.override {
+      version = "4.16-501";
+    };
+  } else merlin-lib
+; in
+let merlin-lib = merlin-lib_v; in
+
 buildDunePackage rec {
   pname = "ocaml-lsp-server";
   inherit (lsp) version src preBuild;
diff --git a/pkgs/development/tools/ocaml/merlin/4.x.nix b/pkgs/development/tools/ocaml/merlin/4.x.nix
index f4c97b9642ec..b15668269494 100644
--- a/pkgs/development/tools/ocaml/merlin/4.x.nix
+++ b/pkgs/development/tools/ocaml/merlin/4.x.nix
@@ -1,7 +1,6 @@
 { lib
 , substituteAll
 , fetchurl
-, fetchpatch
 , ocaml
 , dune_3
 , buildDunePackage
@@ -13,23 +12,23 @@
 , menhir
 , menhirLib
 , menhirSdk
-}:
-
-let
   # Each releases of Merlin support a limited range of versions of OCaml.
-  merlinVersions = {
+, version ? {
     "4.12.0" = "4.7-412";
     "4.12.1" = "4.7-412";
     "4.13.0" = "4.7-413";
     "4.13.1" = "4.7-413";
-    "4.14.0" = "4.16-414";
-    "4.14.1" = "4.16-414";
-    "4.14.2" = "4.16-414";
+    "4.14.0" = "4.17.1-414";
+    "4.14.1" = "4.17.1-414";
+    "4.14.2" = "4.17.1-414";
     "5.0.0" = "4.14-500";
-    "5.1.0" = "4.16-501";
-    "5.1.1" = "4.16-501";
-    "5.2.0" = "5.1-502";
-  };
+    "5.1.0" = "4.17.1-501";
+    "5.1.1" = "4.17.1-501";
+    "5.2.0" = "5.2.1-502";
+  }."${ocaml.version}"
+}:
+
+let
 
   hashes = {
     "4.7-412" = "sha256-0U3Ia7EblKULNy8AuXFVKACZvGN0arYJv7BWiBRgT0Y=";
@@ -37,17 +36,13 @@ let
     "4.14-500" = "sha256-7CPzJPh1UgzYiX8wPMbU5ZXz1wAJFNQQcp8WuGrR1w4=";
     "4.16-414" = "sha256-xekZdfPfVoSeGzBvNWwxcJorE519V2NLjSHkcyZvzy0=";
     "4.16-501" = "sha256-2lvzCbBAZFwpKuRXLMagpwDb0rz8mWrBPI5cODbCHiY=";
-    "5.1-502" = "sha256-T9gIvCaSnP/MqOoGNEeQFZwQ4+r5yRTPRu956Rf8rhU=";
+    "4.17.1-414" = "sha256-vz+AbvSGMgU4YdVLc73vlTm6QhivAh2LCsrY435kX8Y=";
+    "4.17.1-501" = "sha256-N2cHqocfCeljlFbT++S4miHJrXXHdOlMu75n+EKwpQA=";
+    "5.2.1-502" = "sha256-XALccbLTG2GYUcFKlluRxlCk281Jv1YATu5h4MWNWEw=";
   };
 
-  version = lib.getAttr ocaml.version merlinVersions;
-
 in
 
-if !lib.hasAttr ocaml.version merlinVersions
-then builtins.throw "merlin is not available for OCaml ${ocaml.version}"
-else
-
 buildDunePackage {
   pname = "merlin";
   inherit version;
@@ -58,23 +53,14 @@ buildDunePackage {
   };
 
   patches = let
-    branch = lib.head (lib.tail (lib.splitString "-" version));
-    needsVimPatch = lib.versionOlder version "4.17" ||
-                    branch == "502" && lib.versionOlder version "5.2";
+    old-patch = lib.versionOlder version "4.17";
   in
   [
     (substituteAll {
-      src = ./fix-paths.patch;
+      src = if old-patch then ./fix-paths.patch else ./fix-paths2.patch;
       dot_merlin_reader = "${dot-merlin-reader}/bin/dot-merlin-reader";
       dune = "${dune_3}/bin/dune";
     })
-  ] ++ lib.optionals needsVimPatch [
-    # https://github.com/ocaml/merlin/pull/1798
-    (fetchpatch {
-      name = "vim-python-12-syntax-warning-fix.patch";
-      url = "https://github.com/ocaml/merlin/commit/9e0c47b0d5fd0c4edc37c4c7ce927b155877557d.patch";
-      hash = "sha256-HmdTISE/s45C5cwLgsCHNUW6OAPSsvQ/GcJE6VDEobs=";
-    })
   ];
 
   strictDeps = true;
diff --git a/pkgs/development/tools/ocaml/merlin/fix-paths2.patch b/pkgs/development/tools/ocaml/merlin/fix-paths2.patch
new file mode 100644
index 000000000000..5bef154a1702
--- /dev/null
+++ b/pkgs/development/tools/ocaml/merlin/fix-paths2.patch
@@ -0,0 +1,17 @@
+diff --git a/src/kernel/mconfig_dot.ml b/src/kernel/mconfig_dot.ml
+index 0a42a1d3..91997190 100644
+--- a/src/kernel/mconfig_dot.ml
++++ b/src/kernel/mconfig_dot.ml
+@@ -146,10 +146,10 @@ end = struct
+       let prog, args =
+         match cfg with
+         | Dot_merlin ->
+-          let prog = "dot-merlin-reader" in
++          let prog = "@dot-merlin-reader@" in
+           (prog, [| prog |])
+         | Dune ->
+-          let prog = "dune" in
++          let prog = "@dune@" in
+           (prog, [| prog; "ocaml-merlin"; "--no-print-directory" |])
+       in
+       let cwd = Sys.getcwd () in