diff --git a/pkgs/development/compilers/koka/default.nix b/pkgs/development/compilers/koka/default.nix
index 901830ffb70..aec856e47d6 100644
--- a/pkgs/development/compilers/koka/default.nix
+++ b/pkgs/development/compilers/koka/default.nix
@@ -4,19 +4,18 @@
 , parsec, process, regex-compat, text, time }:
 
 let
-  version = "2.4.0";
+  version = "2.4.2";
   src = fetchFromGitHub {
     owner = "koka-lang";
     repo = "koka";
     rev = "v${version}";
-    sha256 = "sha256-+evs5g0qrplUMr8zC51GvUx2JXQBYJb39IaI4rC6CSA=";
+    sha256 = "sha256-sVjaIzOxNuBtDswpDl5gLB10Sw945TQAf2ywrKumqqk=";
     fetchSubmodules = true;
   };
   kklib = stdenv.mkDerivation {
     pname = "kklib";
     inherit version;
     src = "${src}/kklib";
-    patches = [ ./kklib-mimalloc-macos-fix.diff ];
     nativeBuildInputs = [ cmake ];
     outputs = [ "out" "dev" ];
     postInstall = ''
diff --git a/pkgs/development/compilers/koka/kklib-mimalloc-macos-fix.diff b/pkgs/development/compilers/koka/kklib-mimalloc-macos-fix.diff
deleted file mode 100644
index 7d77bfd18af..00000000000
--- a/pkgs/development/compilers/koka/kklib-mimalloc-macos-fix.diff
+++ /dev/null
@@ -1,10 +0,0 @@
---- kklib/mimalloc/src/random.c	1969-12-31 18:00:01.000000000 -0600
-+++ kklib/mimalloc/src/random.c.new	2022-01-16 19:43:54.000000000 -0600
-@@ -195,6 +195,7 @@
- #elif defined(__APPLE__)
- #include <AvailabilityMacros.h>
- #if defined(MAC_OS_X_VERSION_10_10) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_10
-+#include <CommonCrypto/CommonCryptoError.h>
- #include <CommonCrypto/CommonRandom.h>
- #endif
- static bool os_random_buf(void* buf, size_t buf_len) {