diff --git a/nix_update/__init__.py b/nix_update/__init__.py
index 89bbe45..93f9322 100644
--- a/nix_update/__init__.py
+++ b/nix_update/__init__.py
@@ -124,6 +124,12 @@ def parse_args(args: list[str]) -> Options:
         default=[],
     )
 
+    parser.add_argument(
+        "--src-attr",
+        help="Src attribute",
+        default="src",
+    )
+
     a = parser.parse_args(args)
     extra_flags = ["--extra-experimental-features", "flakes nix-command"]
     if a.system:
@@ -146,6 +152,7 @@ def parse_args(args: list[str]) -> Options:
         version=a.version,
         version_preference=VersionPreference.from_str(a.version),
         attribute=a.attribute,
+        source_attribute=a.src_attr,
         test=a.test,
         version_regex=a.version_regex,
         review=a.review,
diff --git a/nix_update/eval.py b/nix_update/eval.py
index 1767056..f85ea69 100644
--- a/nix_update/eval.py
+++ b/nix_update/eval.py
@@ -105,12 +105,19 @@ class Package:
 def eval_expression(
     escaped_import_path: str,
     attr: str,
+    source_attr: str,
     flake: bool,
     system: str | None,
     override_filename: str | None,
 ) -> str:
     system = f'"{system}"' if system else "builtins.currentSystem"
 
+    source_attrs = source_attr.rpartition(".")
+    source_attr_last = source_attrs[-1] or source_attr
+    source_attr_all_but_last = (
+        f".{source_attrs[0]}" if source_attr_last != source_attr else ""
+    )
+
     if flake:
         sanitize_position = (
             f"""
@@ -164,8 +171,8 @@ let
     raw_version_position
   else if pkg ? isPhpExtension then
     raw_version_position
-  else if (builtins.unsafeGetAttrPos "src" pkg) != null then
-    sanitizePosition (builtins.unsafeGetAttrPos "src" pkg)
+  else if (builtins.unsafeGetAttrPos "{source_attr_last}" pkg) != null then
+    sanitizePosition (builtins.unsafeGetAttrPos "{source_attr_last}" pkg{source_attr_all_but_last})
   else
     sanitizePosition (positionFromMeta pkg);
 in {{
@@ -174,11 +181,11 @@ in {{
   inherit raw_version_position;
   filename = position.file;
   line = position.line;
-  urls = pkg.src.urls or null;
-  url = pkg.src.url or null;
-  rev = pkg.src.rev or null;
-  tag = pkg.src.tag or null;
-  hash = pkg.src.outputHash or null;
+  urls = pkg.{source_attr}.urls or null;
+  url = pkg.{source_attr}.url or null;
+  rev = pkg.{source_attr}.rev or null;
+  tag = pkg.{source_attr}.tag or null;
+  hash = pkg.{source_attr}.outputHash or null;
   go_modules = pkg.goModules.outputHash or null;
   go_modules_old = pkg.go-modules.outputHash or null;
   cargo_deps = pkg.cargoDeps.outputHash or null;
@@ -205,7 +212,7 @@ in {{
   mix_deps = pkg.mixFodDeps.outputHash or null;
   tests = builtins.attrNames (pkg.passthru.tests or {{}});
   has_update_script = {has_update_script};
-  src_homepage = pkg.src.meta.homepage or null;
+  src_homepage = pkg.{source_attr}.meta.homepage or null;
   changelog = pkg.meta.changelog or null;
   maintainers = pkg.meta.maintainers or null;
 }}"""
@@ -215,6 +222,7 @@ def eval_attr(opts: Options) -> Package:
     expr = eval_expression(
         opts.escaped_import_path,
         opts.escaped_attribute,
+        opts.source_attribute,
         opts.flake,
         opts.system,
         opts.override_filename,
diff --git a/nix_update/options.py b/nix_update/options.py
index 2d07b77..ab5c305 100644
--- a/nix_update/options.py
+++ b/nix_update/options.py
@@ -8,6 +8,7 @@ from .version.version import VersionPreference
 @dataclass
 class Options:
     attribute: str
+    source_attribute: str = "src"
     flake: bool = False
     version: str = "stable"
     version_preference: VersionPreference = VersionPreference.STABLE
@@ -33,4 +34,7 @@ class Options:
 
     def __post_init__(self) -> None:
         self.escaped_attribute = ".".join(map(json.dumps, self.attribute.split(".")))
+        self.escaped_source_attribute = ".".join(
+            map(json.dumps, self.source_attribute.split("."))
+        )
         self.escaped_import_path = json.dumps(self.import_path)
diff --git a/nix_update/update.py b/nix_update/update.py
index 82b7bc5..464bf3d 100644
--- a/nix_update/update.py
+++ b/nix_update/update.py
@@ -155,7 +155,7 @@ def git_prefetch(x: tuple[str, tuple[str, str]]) -> tuple[str, str]:
 
 
 def update_src_hash(opts: Options, filename: str, current_hash: str) -> None:
-    target_hash = nix_prefetch(opts, "src")
+    target_hash = nix_prefetch(opts, opts.source_attribute)
     replace_hash(filename, current_hash, target_hash)