diff --git a/flake.nix b/flake.nix
index 039da0b..a05d49f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -30,16 +30,14 @@
     ...
   }:
     flake-utils.lib.eachDefaultSystem (system: let
-      gunicornPort = 8001;
-
       pkgs = import nixpkgs {inherit system;};
 
       appDeps = with pkgs.python3Packages; [django_5 django-compressor];
       runtimeDeps = with pkgs; appDeps ++ [python3Packages.geoip2 libmaxminddb];
       buildDeps = with pkgs; appDeps ++ [dart-sass];
 
-      geoip = pkgs.stdenv.mkDerivation {
-        name = "geoip";
+      geoip-archive = pkgs.stdenv.mkDerivation {
+        name = "geoip-archive";
         srcs = [geoip2-asn geoip2-city geoip2-country];
         dontUnpack = true;
         installPhase = ''
@@ -68,39 +66,8 @@
         '';
         installPhase = ''mv static $out'';
       };
-      packages.e11sync = pkgs.stdenv.mkDerivation {
-        name = "e11sync";
-        propagatedBuildInputs = [runtimeDeps];
-        nativeBuildInputs = [pkgs.makeWrapper];
-        src = self;
-        dontUnpack = true;
-        buildPhase = ''
-          mkdir -p $out;
-          cp -r ${self}/app $out
-          makeWrapper ${pkgs.python3Packages.gunicorn}/bin/gunicorn $out/bin/e11sync-gunicorn \
-            --chdir $out/app \
-            --set-default E11SYNC_HTTP_PORT ${toString gunicornPort} \
-            --set E11SYNC_DEBUG "" \
-            --set E11SYNC_COMPRESS_OFFLINE 1 \
-            --set GEOIP_PATH "${geoip}" \
-            --add-flags --bind=127.0.0.1:\$E11SYNC_HTTP_PORT \
-            --add-flags e11sync.wsgi
-
-          makeWrapper $out/app/manage.py $out/bin/e11sync \
-            --set GEOIP_PATH "${geoip}"
-        '';
-        passthru.tests = {
-          simple =
-            pkgs.runCommand "e11sync-test" {
-              src = self;
-              buildInputs = runtimeDeps ++ buildDeps;
-            } ''
-              mkdir -p $out
-              cd ${self}/app
-              export GEOIP_PATH="${geoip}"
-              ${pkgs.python3}/bin/python3 ./manage.py test
-            '';
-        };
+      packages.e11sync = pkgs.callPackage ./pkgs/e11sync.nix {
+        inherit self geoip-archive;
       };
 
       checks.e11sync = packages.e11sync.passthru.tests.simple;
@@ -113,13 +80,13 @@
             export E11SYNC_DATABASE_PATH=$PWD/db.sqlite3
             exec ${packages.e11sync}/bin/e11sync-gunicorn
           '';
-          in "${wrapper}";
+        in "${wrapper}";
       };
 
       devShells.default = pkgs.mkShellNoCC {
         packages = [pkgs.python3Packages.django-debug-toolbar] ++ runtimeDeps ++ buildDeps;
 
-        GEOIP_PATH = "${geoip}";
+        GEOIP_PATH = "${geoip-archive}";
         E11SYNC_DEBUG = "1";
         LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
       };
diff --git a/pkgs/e11sync.nix b/pkgs/e11sync.nix
new file mode 100644
index 0000000..bf5721d
--- /dev/null
+++ b/pkgs/e11sync.nix
@@ -0,0 +1,57 @@
+{
+  self,
+  stdenv,
+  runCommand,
+  makeWrapper,
+  python3,
+  python3Packages,
+  libmaxminddb,
+  dart-sass,
+  gunicornPort ? 8001,
+  geoip-archive,
+}:
+stdenv.mkDerivation {
+  name = "e11sync";
+  propagatedBuildInputs = [
+    python3Packages.django_5
+    python3Packages.django-compressor
+    python3Packages.geoip2
+    libmaxminddb
+  ];
+  nativeBuildInputs = [makeWrapper];
+  src = self;
+  dontUnpack = true;
+  buildPhase = ''
+    mkdir -p $out;
+    cp -r ${self}/app $out
+    makeWrapper ${python3Packages.gunicorn}/bin/gunicorn $out/bin/e11sync-gunicorn \
+      --chdir $out/app \
+      --set-default E11SYNC_HTTP_PORT ${toString gunicornPort} \
+      --set E11SYNC_DEBUG "" \
+      --set E11SYNC_COMPRESS_OFFLINE 1 \
+      --set GEOIP_PATH "${geoip-archive}" \
+      --add-flags --bind=127.0.0.1:\$E11SYNC_HTTP_PORT \
+      --add-flags e11sync.wsgi
+
+    makeWrapper $out/app/manage.py $out/bin/e11sync \
+      --set GEOIP_PATH "${geoip-archive}"
+  '';
+  passthru.tests = {
+    simple =
+      runCommand "e11sync-test" {
+        src = self;
+        buildInputs = [
+          python3Packages.django_5
+          python3Packages.django-compressor
+          python3Packages.geoip2
+          libmaxminddb
+          dart-sass
+        ];
+      } ''
+        mkdir -p $out
+        cd ${self}/app
+        export GEOIP_PATH="${geoip-archive}"
+        ${python3}/bin/python3 ./manage.py test
+      '';
+  };
+}