diff --git a/pkgs/applications/science/chemistry/gwyddion/default.nix b/pkgs/applications/science/chemistry/gwyddion/default.nix
index a4b1cd943e1b..c379e432bdeb 100644
--- a/pkgs/applications/science/chemistry/gwyddion/default.nix
+++ b/pkgs/applications/science/chemistry/gwyddion/default.nix
@@ -16,10 +16,10 @@
 
 stdenv.mkDerivation rec {
   pname = "gwyddion";
-   version = "2.65";
+   version = "2.66";
   src = fetchurl {
     url = "mirror://sourceforge/gwyddion/gwyddion-${version}.tar.xz";
-    sha256 = "sha256-kRX7CoPJY8YkYNode5g0OCyWmL+5sM8puCmk9ZE2nqM=";
+    sha256 = "sha256-N3vtzSsNjRM6MpaG2p9fkYB/8dR5N/mZEZXx6GN5LVI=";
   };
 
   nativeBuildInputs = [ pkg-config file ];