diff --git a/ocaml/default.nix b/ocaml/default.nix
index e8c5eac4..7a081d75 100644
--- a/ocaml/default.nix
+++ b/ocaml/default.nix
@@ -1166,18 +1166,16 @@ with oself;
   jsonrpc = osuper.jsonrpc.overrideAttrs (o: {
     src =
       if lib.versionOlder "5.3" ocaml.version then
-        fetchFromGitHub
+        builtins.fetchurl
           {
-            owner = "ocaml";
-            repo = "ocaml-lsp";
-            rev = "e266e93b8263041a977797c5f230e538a18a4809";
-            hash = "sha256-81A9CBbV67ben/cbOZ5iZ9AQRr0pK17K0ETgnS9f32k=";
+            url = "https://github.com/ocaml/ocaml-lsp/releases/download/1.22.0/lsp-1.22.0.tbz";
+            sha256 = "10dm7whcijqhpf8vd4q6slc92ms3ly0h8n7svq825p0mgmbw77ai";
           }
       else if lib.versionOlder "5.2" ocaml.version then
         builtins.fetchurl
           {
-            url = "https://github.com/ocaml/ocaml-lsp/releases/download/1.20.0/lsp-1.20.0.tbz";
-            sha256 = "151cg2qs6ck7709chdnxsdxhz548rgj87j9q09g93infv87x9mli";
+            url = "https://github.com/ocaml/ocaml-lsp/releases/download/1.21.0/lsp-1.21.0.tbz";
+            sha256 = "05zprrbhpv80qlnlvnipx9vlkq7xm1cgnjvp8fxd5l13zwvh71v7";
           }
       else if
         lib.versionOlder "4.14" ocaml.version
@@ -2211,6 +2209,12 @@ with oself;
     ];
   });
 
+  ppxlib-tools = buildDunePackage {
+    pname = "ppxlib-tools";
+    inherit (ppxlib) version src;
+    propagatedBuildInputs = [ ppxlib cmdliner ];
+  };
+
   processor = buildDunePackage {
     version = "0.2";
     pname = "processor";
diff --git a/ocaml/merlin/lib.nix b/ocaml/merlin/lib.nix
index 74822ba4..1c07e020 100644
--- a/ocaml/merlin/lib.nix
+++ b/ocaml/merlin/lib.nix
@@ -32,12 +32,10 @@ buildDunePackage {
         }
     else if lib.versionOlder "5.3" ocaml.version
     then
-      fetchFromGitHub
+      builtins.fetchurl
         {
-          owner = "ocaml";
-          repo = "merlin";
-          rev = "3438e34a77bd1c3c7a10bffa0c45c419ff91286f";
-          hash = "sha256-EZu/9cOtHMO5jIT2RUEC3EZuCcDRyhXHSihxl29sD6s=";
+          url = "https://github.com/ocaml/merlin/releases/download/v5.4-503/merlin-5.4-503.tbz";
+          sha256 = "1g1cmxscpygk2ig76khcmvz3lgd31xzgzrwj6904r9cwk867ir7j";
         }
     else if lib.versionOlder "5.2" ocaml.version
     then