diff --git a/pkgs/by-name/li/libtasn1/package.nix b/pkgs/by-name/li/libtasn1/package.nix
index c8e506d2bd53..7de5f9bc2b74 100644
--- a/pkgs/by-name/li/libtasn1/package.nix
+++ b/pkgs/by-name/li/libtasn1/package.nix
@@ -11,13 +11,13 @@
   qemu,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "libtasn1";
-  version = "4.20.0";
+  version = "4.21.0";
 
   src = fetchurl {
-    url = "mirror://gnu/libtasn1/libtasn1-${version}.tar.gz";
-    sha256 = "sha256-kuDjvUwC1K7udgNrLd2D8McyukzaXLcdWDJysjWHp2w=";
+    url = "mirror://gnu/libtasn1/libtasn1-${finalAttrs.version}.tar.gz";
+    hash = "sha256-HYpESiI8xUZCQHdzRuEl3lHY5qvwuLrHQqyEYJFn3Ic=";
   };
 
   outputs = [
@@ -50,6 +50,6 @@ stdenv.mkDerivation rec {
     '';
     license = lib.licenses.lgpl2Plus;
     platforms = lib.platforms.all;
-    changelog = "https://gitlab.com/gnutls/libtasn1/-/blob/v${version}/NEWS";
+    changelog = "https://gitlab.com/gnutls/libtasn1/-/blob/v${finalAttrs.version}/NEWS.md";
   };
-}
+})