Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: fontc 0.3.0 -> 0.6.0 https://github.com/googlefonts/fontc/releases
attrpath: fontc
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/by-name/fo/fontc/package.nix b/pkgs/by-name/fo/fontc/package.nix
index 6fab082752d5..519ab9e37d0d 100644
--- a/pkgs/by-name/fo/fontc/package.nix
+++ b/pkgs/by-name/fo/fontc/package.nix
@@ -6,13 +6,13 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "fontc";
-  version = "0.3.0";
+  version = "0.6.0";
 
   src = fetchFromGitHub {
     owner = "googlefonts";
     repo = "fontc";
     tag = "fontc-v${version}";
-    hash = "sha256-Zr2nJRNY1vLGhVOGC3KSWbd4cQReO/F8Wgzx3y/qPFc=";
+    hash = "sha256-EWDAU+hNNpOrGeEy4pUQI5HIcnS2mjjoZrvKnimBLpc=";
   };
   buildAndTestSubdir = "fontc";
 

Received ExitFailure 1 when running
Raw command: nix-build --option sandbox true --arg config "{ allowUnfree = true; allowAliases = false; }" --arg overlays "[ ]" -A fontc
nix build failed.
got build log for 'fontc' from 'daemon'
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/55krwxxc4zvzdxshas567wh361jcifm8-source
source root is source
Executing cargoSetupPostUnpackHook
Finished cargoSetupPostUnpackHook
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
Executing cargoSetupPostPatchHook
Validating consistency between /build/source/Cargo.lock and /build/cargo-vendor-dir/Cargo.lock
Finished cargoSetupPostPatchHook
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: configurePhase
@nix { "action": "setPhase", "phase": "configurePhase" }
Running phase: buildPhase
@nix { "action": "setPhase", "phase": "buildPhase" }
Executing cargoBuildHook
/build/source/fontc /build/source
cargoBuildHook flags: -j 16 --target x86_64-unknown-linux-gnu --offline --profile release
error: failed to select a version for the requirement `kurbo = "^0.12.0"`
candidate versions found which didn't match: 0.11.3
location searched: directory source `/build/cargo-vendor-dir` (which is replacing registry `crates-io`)
required by package `fontdrasil v0.4.0 (/build/source/fontdrasil)`
perhaps a crate was updated and forgotten to be re-vendored?
As a reminder, you're using offline mode (--offline) which can sometimes cause surprising resolution failures, if this error is too confusing you may wish to retry without `--offline`.