diff --git a/nix_update/eval.py b/nix_update/eval.py
index 8f6636f9..ee1bda6c 100644
--- a/nix_update/eval.py
+++ b/nix_update/eval.py
@@ -49,8 +49,7 @@ class Package:
     changelog: Optional[str]
     rev: str
     hash: Optional[str]
-    vendor_hash: Optional[str]
-    vendor_sha256: Optional[str]
+    go_modules: Optional[str]
     cargo_deps: Optional[str]
     npm_deps: Optional[str]
     tests: List[str]
@@ -141,8 +140,7 @@ def eval_expression(
   url = pkg.src.url or null;
   rev = pkg.src.rev or null;
   hash = pkg.src.outputHash or null;
-  vendor_hash = pkg.vendorHash or null;
-  vendor_sha256 = pkg.vendorSha256 or null;
+  go_modules = pkg.go-modules.outputHash or null;
   cargo_deps = pkg.cargoDeps.outputHash or null;
   raw_cargo_lock =
     if pkg ? cargoDeps.lockFile then
diff --git a/nix_update/update.py b/nix_update/update.py
index fd93de72..ddb2dbbd 100644
--- a/nix_update/update.py
+++ b/nix_update/update.py
@@ -332,11 +332,8 @@ def update(opts: Options) -> Package:
 
     # if no package.hash was provided we just update the other hashes unconditionally
     if update_hash or not package.hash:
-        if package.vendor_hash and package.vendor_sha256 == "_unset":
-            update_go_modules_hash(opts, package.filename, package.vendor_hash)
-
-        if package.vendor_sha256 and package.vendor_hash == "_unset":
-            update_go_modules_hash(opts, package.filename, package.vendor_sha256)
+        if package.go_modules:
+            update_go_modules_hash(opts, package.filename, package.go_modules)
 
         if package.cargo_deps:
             update_cargo_deps_hash(opts, package.filename, package.cargo_deps)