diff --git a/pkgs/servers/varnish/dynamic.nix b/pkgs/servers/varnish/dynamic.nix
index 637380a5abd4..78fd4d106412 100644
--- a/pkgs/servers/varnish/dynamic.nix
+++ b/pkgs/servers/varnish/dynamic.nix
@@ -1,14 +1,14 @@
-{ lib, stdenv, fetchFromGitHub, autoreconfHook269, pkg-config, varnish, docutils }:
+{ lib, stdenv, fetchFromGitHub, autoreconfHook269, pkg-config, varnish, docutils, version, sha256 }:
 
-stdenv.mkDerivation rec {
-  version = "0.4";
+stdenv.mkDerivation {
   pname = "${varnish.name}-dynamic";
+  inherit version;
 
   src = fetchFromGitHub {
     owner = "nigoroll";
     repo = "libvmod-dynamic";
     rev = "v${version}";
-    sha256 = "1n94slrm6vn3hpymfkla03gw9603jajclg84bjhwb8kxsk3rxpmk";
+    inherit sha256;
   };
 
   nativeBuildInputs = [ pkg-config docutils autoreconfHook269 varnish.python ];
diff --git a/pkgs/servers/varnish/packages.nix b/pkgs/servers/varnish/packages.nix
index 1932561be8ad..9876f131ff0d 100644
--- a/pkgs/servers/varnish/packages.nix
+++ b/pkgs/servers/varnish/packages.nix
@@ -1,12 +1,19 @@
-{ callPackage, varnish60, varnish65 }:
-
-{
+{ callPackage, varnish60, varnish65, fetchFromGitHub }: {
   varnish60Packages = {
     varnish = varnish60;
     digest  = callPackage ./digest.nix   { varnish = varnish60; };
-    dynamic = callPackage ./dynamic.nix  { varnish = varnish60; };
+    dynamic = callPackage ./dynamic.nix  {
+      varnish = varnish60;
+      version = "0.4";
+      sha256 = "1n94slrm6vn3hpymfkla03gw9603jajclg84bjhwb8kxsk3rxpmk";
+    };
   };
   varnish65Packages = {
     varnish = varnish65;
+    dynamic = callPackage ./dynamic.nix  {
+      varnish = varnish65;
+      version = "2.3.1";
+      sha256 = "060vkba7jwcvx5704hh6ds0g0kfzpkdrg8548frvkrkz2s5j9y88";
+    };
   };
 }