diff --git a/pkgs/applications/science/astronomy/gildas/default.nix b/pkgs/applications/science/astronomy/gildas/default.nix
index 5767efab733c..3b31f069b0e4 100644
--- a/pkgs/applications/science/astronomy/gildas/default.nix
+++ b/pkgs/applications/science/astronomy/gildas/default.nix
@@ -7,8 +7,8 @@ let
 in
 
 stdenv.mkDerivation rec {
-  srcVersion = "apr24a";
-  version = "20240401_a";
+  srcVersion = "sep24a";
+  version = "20240901_a";
   pname = "gildas";
 
   src = fetchurl {
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
     # source code of the previous release to a different directory
     urls = [ "http://www.iram.fr/~gildas/dist/gildas-src-${srcVersion}.tar.xz"
       "http://www.iram.fr/~gildas/dist/archive/gildas/gildas-src-${srcVersion}.tar.xz" ];
-    sha256 = "sha256-Eq6S5S8xrhkCo6O2wUaHnoMDVG9WeiSurGvOc+2JKbM=";
+    sha256 = "sha256-dZ03J3I1dgoSgSc9yGfO13ZvNawCSYKN3+SGvp1eyGA=";
   };
 
   nativeBuildInputs = [ pkg-config groff perl getopt gfortran which ];