diff --git a/flake.nix b/flake.nix
index 21fc952..d952a6d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -515,7 +515,7 @@
 
         msys2-offline-installer = pkgs.stdenv.mkDerivation {
           name = "msys2-offline-installer";
-          buildInputs = with pkgs; [ p7zip wine64 ];
+          buildInputs = with pkgs; [ p7zip ];
           src = ./.;
           msys2_qt_ifw = pkgs.stdenvNoCC.mkDerivation rec {
             name = "msys2_qt_ifw";
@@ -564,7 +564,7 @@
              # needed for sed and 7z
              chmod -R 700 qt-ifw
              sed -i "s|@DATE@|$(date +'%Y-%m-%d')|g" qt-ifw/config/config.xml qt-ifw/packages/com.msys2.root/meta/package.xml ;
-             sed -i "s|@VERSION@|$(date +'%Y%m%d')|g" qt-ifw/config/config.xml qt-ifw/packages/com.msys2.root/meta/package.xml ;
+             sed -i "s|@VERSION@|${artiqpkgs.packages.x86_64-linux.artiq.version}|g" qt-ifw/config/config.xml qt-ifw/packages/com.msys2.root/meta/package.xml ;
 
              7z a -mx9 -md128m "qt-ifw/packages/com.msys2.root/data/msys64.7z" "$msys2_artiq_root/"*
              ${pkgs.wineWowPackages.stable}/bin/wine64 $msys2_qt_ifw/mingw64/bin/binarycreator.exe \