diff --git a/pkgs/tools/misc/grass-sass/default.nix b/pkgs/tools/misc/grass-sass/default.nix
index 0ca638e0768e..4b67a1cc3e5c 100644
--- a/pkgs/tools/misc/grass-sass/default.nix
+++ b/pkgs/tools/misc/grass-sass/default.nix
@@ -5,14 +5,14 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "grass";
-  version = "0.12.4";
+  version = "0.13.0";
 
   src = fetchCrate {
     inherit pname version;
-    hash = "sha256-tp3L8TDIG/92RupRAyRWSiALqE1XBK8jespKcSdSzsM=";
+    hash = "sha256-TRBbRKNr+/12dk8z7NAxAj/s+cGEQddXXuY2xmguLD8=";
   };
 
-  cargoHash = "sha256-hxVcHD5k1YwXCOq1UdiivPLwtY2egGvf/T3NrZTAB/k=";
+  cargoHash = "sha256-Kr/zTtZWAR0ZinhrlimoEtRMT+BrlO0MvhEJVlheXeM=";
 
   # tests require rust nightly
   doCheck = false;