diff --git a/pkgs/applications/science/astronomy/gnuastro/default.nix b/pkgs/applications/science/astronomy/gnuastro/default.nix
index 69f4011f2737..a1fef6404e46 100644
--- a/pkgs/applications/science/astronomy/gnuastro/default.nix
+++ b/pkgs/applications/science/astronomy/gnuastro/default.nix
@@ -3,11 +3,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gnuastro";
-  version = "0.20";
+  version = "0.21";
 
   src = fetchurl {
     url = "mirror://gnu/gnuastro/gnuastro-${version}.tar.gz";
-    sha256 = "sha256-kkuLtqwc0VFj3a3Dqb/bi4jKx7UJnV+CHs7bw/Cwac0=";
+    sha256 = "sha256-L7qZPYQiORUXtV9+tRF4iUbXqIaqFYSYT9Rni90nU38=";
   };
 
   nativeBuildInputs = [ libtool ];