diff --git a/pkgs/tools/networking/whois/default.nix b/pkgs/tools/networking/whois/default.nix
index 1fd5cb97383e..1b29b0889b64 100644
--- a/pkgs/tools/networking/whois/default.nix
+++ b/pkgs/tools/networking/whois/default.nix
@@ -1,14 +1,14 @@
 { lib, stdenv, fetchFromGitHub, fetchpatch, perl, gettext, pkg-config, libidn2, libiconv }:
 
 stdenv.mkDerivation rec {
-  version = "5.5.20";
+  version = "5.5.21";
   pname = "whois";
 
   src = fetchFromGitHub {
     owner = "rfc1036";
     repo = "whois";
     rev = "v${version}";
-    hash = "sha256-0vQ6GBBtNA6Phlqhl3NZvEJqoyZ1um7VdkpsIRKhsm4=";
+    hash = "sha256-iVt/4rxOgF1wZBy+Lnh7jR7HDk2Y7hwljt9FrFuXdHg=";
   };
 
   patches = [