diff --git a/pkgs/development/compilers/haxe/default.nix b/pkgs/development/compilers/haxe/default.nix
index f673eb6d0340..99fde9c66a59 100644
--- a/pkgs/development/compilers/haxe/default.nix
+++ b/pkgs/development/compilers/haxe/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, coreutils, ocaml-ng, zlib, pcre, neko, mbedtls_2, Security }:
+{ lib, stdenv, fetchFromGitHub, coreutils, ocaml-ng, zlib, pcre, pcre2, neko, mbedtls_2, Security }:
 
 let
   ocamlDependencies = version:
@@ -37,7 +37,8 @@ let
       pname = "haxe";
       inherit version;
 
-      buildInputs = [ zlib pcre neko ]
+      buildInputs = [ zlib neko ]
+        ++ (if lib.versionAtLeast version "4.3" then [pcre2] else [pcre])
         ++ lib.optional (lib.versionAtLeast version "4.1") mbedtls_2
         ++ lib.optional (lib.versionAtLeast version "4.1" && stdenv.isDarwin) Security
         ++ ocamlDependencies version;
@@ -124,8 +125,8 @@ in {
     version = "4.1.5";
     sha256 = "0rns6d28qzkbai6yyws08yzbyvxfn848nj0fsji7chdi0y7pzzj0";
   };
-  haxe_4_2 = generic {
-    version = "4.2.5";
-    sha256 = "sha256-Y0gx6uOQX4OZgg8nK4GJxRR1rKh0S2JUjZQFVQ4cfTs=";
+  haxe_4_3 = generic {
+    version = "4.3.3";
+    sha256 = "sha256-sMklqQkVbWCYCKpOU23AjkuxzcVV7Aa8ljlFpruam9Y=";
   };
 }
diff --git a/pkgs/development/ocaml-modules/luv/default.nix b/pkgs/development/ocaml-modules/luv/default.nix
index da7f9ba1808f..3f2d462fd15e 100644
--- a/pkgs/development/ocaml-modules/luv/default.nix
+++ b/pkgs/development/ocaml-modules/luv/default.nix
@@ -6,12 +6,13 @@
 
 buildDunePackage rec {
   pname = "luv";
-  version = "0.5.11";
-  useDune2 = true;
+  version = "0.5.12";
+
+  minimalOCamlVersion = "4.03";
 
   src = fetchurl {
     url = "https://github.com/aantron/luv/releases/download/${version}/luv-${version}.tar.gz";
-    sha256 = "sha256-zOz0cxGzhLi3Q36qyStNCz8JGXHtECQfZysMKiyKOkM=";
+    sha256 = "sha256-dp9qCIYqSdROIAQ+Jw73F3vMe7hnkDe8BgZWImNMVsA=";
   };
 
   postConfigure = ''
@@ -23,6 +24,7 @@ buildDunePackage rec {
   nativeBuildInputs = [ file ];
   propagatedBuildInputs = [ ctypes result ];
   checkInputs = [ alcotest ];
+  # Alcotest depends on fmt that needs 4.08 or newer
   doCheck = lib.versionAtLeast ocaml.version "4.08";
 
   meta = with lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 363335ce023f..ddf76ff732dc 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16317,12 +16317,12 @@ with pkgs;
   inherit (callPackage ../development/compilers/haxe {
     inherit (darwin.apple_sdk.frameworks) Security;
   })
-    haxe_4_2
+    haxe_4_3
     haxe_4_1
     haxe_4_0
     ;
 
-  haxe = haxe_4_2;
+  haxe = haxe_4_3;
   haxePackages = recurseIntoAttrs (callPackage ./haxe-packages.nix { });
   inherit (haxePackages) hxcpp;