diff --git a/pkgs/by-name/bi/bind/package.nix b/pkgs/by-name/bi/bind/package.nix
index c49ae029d7fa..0c4a7dd86461 100644
--- a/pkgs/by-name/bi/bind/package.nix
+++ b/pkgs/by-name/bi/bind/package.nix
@@ -29,11 +29,11 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "bind";
-  version = "9.20.18";
+  version = "9.20.21";
 
   src = fetchurl {
     url = "https://downloads.isc.org/isc/bind9/${finalAttrs.version}/bind-${finalAttrs.version}.tar.xz";
-    hash = "sha256-38VGyZCsRRVSnNRcTdmVhisYrootDLKSCOiJal0yUzE=";
+    hash = "sha256-FeG1oifSiQ98ToI6bqAY3nDuLzoOhZy/89gqrYWQ3gM=";
   };
 
   outputs = [