diff --git a/pkgs/applications/virtualization/dynamips/default.nix b/pkgs/applications/virtualization/dynamips/default.nix
index 9419939d1c7..cce5a674f7c 100644
--- a/pkgs/applications/virtualization/dynamips/default.nix
+++ b/pkgs/applications/virtualization/dynamips/default.nix
@@ -3,13 +3,13 @@
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
   pname = "dynamips";
-  version = "0.2.20";
+  version = "0.2.21";
 
   src = fetchFromGitHub {
     owner = "GNS3";
     repo = pname;
     rev = "v${version}";
-    sha256 = "1841h0m0k0p3c3ify4imafjk7jigcj2zlr8rn3iyp7jnafkxqik7";
+    sha256 = "0pvdqs6kjz0x0wqb5f1k3r25dg82wssm7wz4psm0m6bxsvf5l0i5";
   };
 
   nativeBuildInputs = [ cmake ];