diff --git a/flake.lock b/flake.lock
index fd3b953f2..9ec67874e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1766482245,
-        "narHash": "sha256-EoXpMYCUPBjvjbjd2gOMqXJg4zAmVUW0t+sUeQwPbG4=",
+        "lastModified": 1769833275,
+        "narHash": "sha256-Qpn6/tkn6uVpCgF+XjMPZEzn6eWI0wnYik5mcNFV0HY=",
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
-        "rev": "b0e1699cda4b43223a58d2d1964da80b727e009e",
+        "rev": "a747db22ad096b5ce4574983994ba0e201c2991e",
         "type": "github"
       },
       "original": {
@@ -20,17 +20,17 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1766427476,
-        "narHash": "sha256-KHgJHYGYuHUtJPBjczN0kFrWHmdfUXPa0Km6Yq/ELEE=",
+        "lastModified": 1769813739,
+        "narHash": "sha256-3VA9DOP24+RHTL7oRFBA6GAy/GkvAujI8L4yr57DMgw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6dd5b55337d892a8a441aaad31bf1a4165b453bc",
+        "rev": "16a3cae5c2487b1afa240e5f2c1811f172419558",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6dd5b55337d892a8a441aaad31bf1a4165b453bc",
+        "rev": "16a3cae5c2487b1afa240e5f2c1811f172419558",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index db901e100..82e28211e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,28 +5,43 @@
     nixpkgs.url = "github:nix-ocaml/nix-overlays";
   };
 
-  outputs = { self, nixpkgs }:
+  outputs =
+    { self, nixpkgs }:
     let
-      forAllSystems = f: nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (system:
-        let
-          pkgs = nixpkgs.legacyPackages.${system}.extend (self: super: {
-            ocamlPackages = super.ocaml-ng.ocamlPackages_5_2;
-          });
-        in
-        f pkgs);
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system:
+          let
+            pkgs = nixpkgs.legacyPackages.${system}.extend (
+              self: super: {
+                ocamlPackages = super.ocaml-ng.ocamlPackages_5_4;
+              }
+            );
+          in
+          f pkgs
+        );
     in
     {
-      packages = forAllSystems (pkgs:
+      packages = forAllSystems (
+        pkgs:
         let
           inherit (pkgs.ocamlPackages)
-            buildDunePackage melange merlin ppxlib_gt_0_37 reason;
+            buildDunePackage
+            melange
+            merlin
+            ppxlib_gt_0_37
+            reason
+            ;
           packages = rec {
             reason-react-ppx = buildDunePackage {
               pname = "reason-react-ppx";
               version = "n/a";
 
               src =
-                let fs = pkgs.lib.fileset; in
+                let
+                  fs = pkgs.lib.fileset;
+                in
                 fs.toSource {
                   root = ./.;
                   fileset = fs.unions [
@@ -48,7 +63,9 @@
               version = "n/a";
 
               src =
-                let fs = pkgs.lib.fileset; in
+                let
+                  fs = pkgs.lib.fileset;
+                in
                 fs.toSource {
                   root = ./.;
                   fileset = fs.unions [
@@ -61,28 +78,47 @@
                 };
 
               doCheck = true;
-              nativeBuildInputs = [ melange reason ];
-              propagatedBuildInputs = [ melange reason-react-ppx ];
+              nativeBuildInputs = [
+                melange
+                reason
+              ];
+              propagatedBuildInputs = [
+                melange
+                reason-react-ppx
+              ];
             };
           };
         in
-        packages // { default = packages.reason-react; });
+        packages // { default = packages.reason-react; }
+      );
 
-      devShells = forAllSystems (pkgs:
+      devShells = forAllSystems (
+        pkgs:
         let
-          makeDevShell = { packages, release-mode ? false }:
+          makeDevShell =
+            {
+              packages,
+              release-mode ? false,
+            }:
             pkgs.mkShell {
               dontDetectOcamlConflicts = true;
               inputsFrom = pkgs.lib.attrValues packages;
               nativeBuildInputs =
-                with pkgs.ocamlPackages; [ ocamlformat pkgs.nodejs_latest ]
-                  ++ pkgs.lib.optionals release-mode (with pkgs; [
-                  cacert
-                  curl
-                  ocamlPackages.dune-release
-                  ocamlPackages.odoc
-                  git
-                ]);
+                with pkgs.ocamlPackages;
+                [
+                  ocamlformat
+                  pkgs.nodejs_24
+                ]
+                ++ pkgs.lib.optionals release-mode (
+                  with pkgs;
+                  [
+                    cacert
+                    curl
+                    ocamlPackages.dune-release
+                    ocamlPackages.odoc
+                    git
+                  ]
+                );
               propagatedBuildInputs = with pkgs.ocamlPackages; [ merlin ];
             };
           packages = self.packages.${pkgs.stdenv.hostPlatform.system};
@@ -93,6 +129,7 @@
             inherit packages;
             release-mode = true;
           };
-        });
+        }
+      );
     };
 }