diff --git a/pkgs/development/libraries/ngtcp2/gnutls.nix b/pkgs/development/libraries/ngtcp2/gnutls.nix
index 17e1f569f8c6..62b03f8b230e 100644
--- a/pkgs/development/libraries/ngtcp2/gnutls.nix
+++ b/pkgs/development/libraries/ngtcp2/gnutls.nix
@@ -13,13 +13,13 @@
 
 stdenv.mkDerivation rec {
   pname = "ngtcp2";
-  version = "1.20.0";
+  version = "1.21.0";
 
   src = fetchFromGitHub {
     owner = "ngtcp2";
     repo = "ngtcp2";
     rev = "v${version}";
-    hash = "sha256-8enkRWmPLZXBtlD9v8N7zuZB+Fv+igl30W7q2UqI2ZE=";
+    hash = "sha256-8dfktmiiwJ0CVB5BCNBLmTYuUG9Y9Ik2esJNmynJvCU=";
   };
 
   outputs = [