diff --git a/pkgs/development/compilers/mlton/20210117-binary.nix b/pkgs/development/compilers/mlton/20210117-binary.nix
index 40e9482ba1fb..cfff5645bfee 100644
--- a/pkgs/development/compilers/mlton/20210117-binary.nix
+++ b/pkgs/development/compilers/mlton/20210117-binary.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, patchelf, gmp }:
+{ lib, stdenv, fetchpatch, fetchurl, patchelf, gmp }:
 let
   dynamic-linker = stdenv.cc.bintools.dynamicLinker;
 in
@@ -9,17 +9,31 @@ stdenv.mkDerivation rec {
   src =
     if stdenv.hostPlatform.system == "x86_64-linux" then
       (fetchurl {
-        url = "https://github.com/MLton/mlton/releases/download/on-${version}-release/${pname}-${version}-1.amd64-linux-glibc2.31.tgz.tgz";
-        sha256 = "0f4q575yfm5dpg4a2wsnqn4l2zrar96p6rlsk0dw10ggyfwvsjlf";
+        url = "https://github.com/MLton/mlton/releases/download/on-${version}-release/${pname}-${version}-1.amd64-linux-glibc2.31.tgz";
+        sha256 = "1lj51xg9p75qj1x5036lvjvd4a2j21kfi6vh8d0n9kdcdffvb73l";
       })
     else if stdenv.hostPlatform.system == "x86_64-darwin" then
       (fetchurl {
         url = "https://github.com/MLton/mlton/releases/download/on-${version}-release/${pname}-${version}-1.amd64-darwin-19.6.gmp-static.tgz";
-        sha256 = "1cw7yhw48qp12q0adwf8srpjzrgkp84kmlkqw3pz8vkxz4p9hbdv";
+        sha256 = "0xndr2awlxdqr81j6snl9zqjx8r6f5fy9x65j1w899kf2dh9zsjv";
+      })
+    else if stdenv.hostPlatform.system == "aarch64-darwin" then
+      (fetchurl {
+        url = "https://projects.laas.fr/tina/software/mlton-${version}-1.arm64-darwin-21.6-gmp-static.tgz";
+        sha256 = "1s61ayk3yj2xw8ilqk3fhb03x5x1wcakkmbhhvcsfb2hdw2c932x";
       })
     else
       throw "Architecture not supported";
 
+  patches = [
+    (fetchpatch {
+      name = "remove-duplicate-if.patch";
+      url = "https://github.com/MLton/mlton/commit/22002cd0a53a1ab84491d74cb8dc6a4e50c1f7b7.patch";
+      decode = "sed -e 's|Makefile\.binary|Makefile|g'";
+      hash = "sha256-Gtmc+OIh+m7ordSn74fpOKVDQDtYyLHe6Le2snNCBYQ=";
+    })
+  ];
+
   buildInputs = [ gmp ];
   nativeBuildInputs = lib.optional stdenv.hostPlatform.isLinux patchelf;
 
diff --git a/pkgs/development/compilers/mlton/default.nix b/pkgs/development/compilers/mlton/default.nix
index d2704a4093d0..a74d1d85455b 100644
--- a/pkgs/development/compilers/mlton/default.nix
+++ b/pkgs/development/compilers/mlton/default.nix
@@ -15,14 +15,14 @@ rec {
   mlton20210117Binary = callPackage ./20210117-binary.nix { };
 
   mlton20210117 = callPackage ./from-git-source.nix {
-    mltonBootstrap = mlton20180207Binary;
+    mltonBootstrap = mlton20210117Binary;
     version = "20210117";
     rev = "on-20210117-release";
     sha256 = "sha256-rqL8lnzVVR+5Hc7sWXK8dCXN92dU76qSoii3/4StODM=";
   };
 
   mltonHEAD = callPackage ./from-git-source.nix {
-    mltonBootstrap = mlton20180207Binary;
+    mltonBootstrap = mlton20210117Binary;
     version = "HEAD";
     rev = "875f7912a0b135a9a7e86a04ecac9cacf0bfe5e5";
     sha256 = "sha256-/MIoVqqv8qrJPehU7VRFpXtAAo8UUzE3waEvB7WnS9A=";
diff --git a/pkgs/development/compilers/mlton/meta.nix b/pkgs/development/compilers/mlton/meta.nix
index 1e4c0aacfc3c..afb11847adb6 100644
--- a/pkgs/development/compilers/mlton/meta.nix
+++ b/pkgs/development/compilers/mlton/meta.nix
@@ -11,5 +11,5 @@
 
   homepage = "http://mlton.org/";
   license = "bsd";
-  platforms = [ "i686-linux" "x86_64-linux" "x86_64-darwin"];
+  platforms = [ "i686-linux" "x86_64-linux" "x86_64-darwin" "aarch64-darwin"];
 }