diff --git a/pkgs/applications/emulators/dynamips/default.nix b/pkgs/applications/emulators/dynamips/default.nix
index 9c7261f09301..80910700da93 100644
--- a/pkgs/applications/emulators/dynamips/default.nix
+++ b/pkgs/applications/emulators/dynamips/default.nix
@@ -4,17 +4,18 @@
 , cmake
 , libelf
 , libpcap
+, nix-update-script
 }:
 
 stdenv.mkDerivation rec {
   pname = "dynamips";
-  version = "0.2.22";
+  version = "0.2.23";
 
   src = fetchFromGitHub {
     owner = "GNS3";
     repo = pname;
     rev = "v${version}";
-    sha256 = "1fjjjdaxlw1k95kyq73fndn21qfhrm4cn79av0i4sn7anhg8m83f";
+    hash = "sha256-+h+WsZ/QrDd+dNrR6CJb2uMG+vbUvK8GTxFJZOxknL0=";
   };
 
   nativeBuildInputs = [ cmake ];
@@ -22,6 +23,10 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [ "-DDYNAMIPS_CODE=stable" ];
 
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
   meta = with lib; {
     inherit (src.meta) homepage;
     description = "A Cisco router emulator";