diff --git a/pkgs/tools/package-management/harmonia/default.nix b/pkgs/tools/package-management/harmonia/default.nix
index 267b04a700aa..f3c121c7c734 100644
--- a/pkgs/tools/package-management/harmonia/default.nix
+++ b/pkgs/tools/package-management/harmonia/default.nix
@@ -11,16 +11,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "harmonia";
-  version = "0.6.3";
+  version = "0.6.4";
 
   src = fetchFromGitHub {
     owner = "nix-community";
     repo = pname;
     rev = "refs/tags/${pname}-v${version}";
-    hash = "sha256-erBmPXMyIYxRLbYG35vH67MypJoXomUEFOVu6IhmEWs=";
+    hash = "sha256-JH0tdUCadvovAJclpx7Fn1oD+POFpBFHdullRTcFaVQ=";
   };
 
-  cargoHash = "sha256-Gq7U+Uy3psuPVY0wGM90KA5u5Wc2s4hVJma7B11Ag5g=";
+  cargoHash = "sha256-Wa+7Vo5VWmx47Uf6YtlzHReoWY44SxdOnscSFu74OSM=";
 
   nativeBuildInputs = [
     pkg-config nix