diff --git a/pkgs/by-name/mi/mimalloc/package.nix b/pkgs/by-name/mi/mimalloc/package.nix
index 6f4c2362a33e..810596fdfe03 100644
--- a/pkgs/by-name/mi/mimalloc/package.nix
+++ b/pkgs/by-name/mi/mimalloc/package.nix
@@ -12,13 +12,13 @@ let
 in
 stdenv.mkDerivation (finalAttrs: {
   pname = "mimalloc";
-  version = "3.3.2";
+  version = "3.4.5";
 
   src = fetchFromGitHub {
     owner = "microsoft";
     repo = "mimalloc";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-GZ37qQVDe9jgMb4Coe5oKvgaLTspZDlSkS5rdy1MfUU=";
+    hash = "sha256-vNVZw2YsDkf0GcdFTNb/fXMQLQYvoc8P425LupPShpo=";
   };
 
   doCheck = !stdenv.hostPlatform.isStatic;