diff --git a/cachi2/core/package_managers/yarn_classic/resolver.py b/cachi2/core/package_managers/yarn_classic/resolver.py
index bb747c68a..4949bd11b 100644
--- a/cachi2/core/package_managers/yarn_classic/resolver.py
+++ b/cachi2/core/package_managers/yarn_classic/resolver.py
@@ -218,8 +218,8 @@ def _get_workspace_packages(
     """Return a WorkspacePackage for each Workspace."""
     return [
         WorkspacePackage(
-            name=ws.package_contents["name"],
-            version=ws.package_contents.get("version"),
+            name=ws.package_json.data.get("name"),
+            version=ws.package_json.data.get("version"),
             relpath=ws.path.relative_to(source_dir.path),
         )
         for ws in workspaces
diff --git a/cachi2/core/package_managers/yarn_classic/workspaces.py b/cachi2/core/package_managers/yarn_classic/workspaces.py
index b5f558498..02f091c3c 100644
--- a/cachi2/core/package_managers/yarn_classic/workspaces.py
+++ b/cachi2/core/package_managers/yarn_classic/workspaces.py
@@ -6,20 +6,27 @@
 import pydantic
 
 from cachi2.core.errors import PackageRejected
+from cachi2.core.package_managers.yarn_classic.project import PackageJson
 from cachi2.core.rooted_path import RootedPath
 
 
 class Workspace(pydantic.BaseModel):
-    """Workspace model."""
+    """
+    Workspace model.
+
+    Attributes:
+        path: Path to workspace directory.
+        package_json: Content of package.json file.
+    """
 
-    path: Path  # path to a workspace.
-    package_contents: dict  # package data extracted from path/"package.json".
+    path: Path
+    package_json: PackageJson
 
-    @pydantic.field_validator("package_contents")
-    def _ensure_package_is_named(cls, package_contents: dict) -> dict:
-        if "name" not in package_contents:
+    @pydantic.field_validator("package_json")
+    def _ensure_package_is_named(cls, package_json: PackageJson) -> PackageJson:
+        if "name" not in package_json.data:
             raise ValueError("Workspaces must contain 'name' field.")
-        return package_contents
+        return package_json
 
 
 def ensure_no_path_leads_out(
@@ -83,21 +90,23 @@ def _read_package_from(path: RootedPath) -> dict[str, Any]:
     return json.loads(path.join_within_root("package.json").path.read_text())
 
 
-def extract_workspace_metadata(
-    package_path: RootedPath,
-) -> list[Workspace]:
+def extract_workspace_metadata(package_path: RootedPath) -> list[Workspace]:
     """Extract workspace metadata from a package."""
-    processed_package = _read_package_from(package_path)
-    workspaces_globs = _extract_workspaces_globs(processed_package)
+    package_json = PackageJson.from_file(package_path.join_within_root("package.json"))
+    workspaces_globs = _extract_workspaces_globs(package_json.data)
     workspaces_paths = _get_workspace_paths(workspaces_globs, package_path)
     ensure_no_path_leads_out(workspaces_paths, package_path)
     _ensure_workspaces_are_well_formed(workspaces_paths)
+
     parsed_workspaces = []
     for wp in workspaces_paths:
         parsed_workspaces.append(
             Workspace(
                 path=wp,
-                package_contents=_read_package_from(package_path.join_within_root(wp)),
+                package_json=PackageJson.from_file(
+                    package_path.join_within_root(wp, "package.json")
+                ),
             )
         )
+
     return parsed_workspaces
diff --git a/tests/unit/package_managers/yarn_classic/test_resolver.py b/tests/unit/package_managers/yarn_classic/test_resolver.py
index 1b5ec44b2..af96349a5 100644
--- a/tests/unit/package_managers/yarn_classic/test_resolver.py
+++ b/tests/unit/package_managers/yarn_classic/test_resolver.py
@@ -324,16 +324,23 @@ def test__get_main_package_no_name(rooted_tmp_path: RootedPath) -> None:
 
 
 def test__get_workspace_packages(rooted_tmp_path: RootedPath) -> None:
-    workspace_path = rooted_tmp_path.join_within_root("foo").path
+    workspace_path = rooted_tmp_path.join_within_root("foo")
+    workspace_path.path.mkdir()
+
+    package_json_path = workspace_path.join_within_root("package.json")
+    package_json_path.path.write_text('{"name": "foo", "version": "1.0.0"}')
+
+    package_json = PackageJson.from_file(package_json_path)
     workspace = Workspace(
-        path=workspace_path,
-        package_contents={"name": "foo", "version": "1.0.0"},
+        path=workspace_path.path,
+        package_json=package_json,
     )
+
     expected = [
         WorkspacePackage(
             name="foo",
             version="1.0.0",
-            relpath=workspace_path.relative_to(rooted_tmp_path.path),
+            relpath=workspace_path.path.relative_to(rooted_tmp_path.path),
         )
     ]
 
diff --git a/tests/unit/package_managers/yarn_classic/test_workspaces.py b/tests/unit/package_managers/yarn_classic/test_workspaces.py
index 31623484c..3b16ebfcd 100644
--- a/tests/unit/package_managers/yarn_classic/test_workspaces.py
+++ b/tests/unit/package_managers/yarn_classic/test_workspaces.py
@@ -4,6 +4,7 @@
 import pytest
 
 from cachi2.core.errors import PathOutsideRoot
+from cachi2.core.package_managers.yarn_classic.project import PackageJson
 from cachi2.core.package_managers.yarn_classic.workspaces import (
     Workspace,
     _extract_workspaces_globs,
@@ -13,21 +14,19 @@
 from cachi2.core.rooted_path import RootedPath
 
 
-@mock.patch("cachi2.core.package_managers.yarn_classic.workspaces._read_package_from")
 @mock.patch("cachi2.core.package_managers.yarn_classic.workspaces._get_workspace_paths")
 def test_packages_with_workspaces_outside_source_dir_are_rejected(
     mock_get_ws_paths: mock.Mock,
-    mock_read_package_from: mock.Mock,
+    rooted_tmp_path: RootedPath,
 ) -> None:
-    mock_read_package_from.return_value = {"workspaces": ["../../usr"]}
-    mock_get_ws_paths.return_value = [Path("/tmp/foo/bar"), Path("/usr")]
-    package_path = RootedPath("/tmp/foo")
+    package_json_path = rooted_tmp_path.join_within_root("package.json")
+    package_json_path.path.write_text('{"workspaces": ["../../usr"]}')
+    mock_get_ws_paths.return_value = [Path("/usr")]
 
     with pytest.raises(PathOutsideRoot):
-        extract_workspace_metadata(package_path)
+        extract_workspace_metadata(rooted_tmp_path)
 
 
-@mock.patch("cachi2.core.package_managers.yarn_classic.workspaces._read_package_from")
 @mock.patch("cachi2.core.package_managers.yarn_classic.workspaces._get_workspace_paths")
 @mock.patch(
     "cachi2.core.package_managers.yarn_classic.workspaces._ensure_workspaces_are_well_formed"
@@ -35,19 +34,25 @@ def test_packages_with_workspaces_outside_source_dir_are_rejected(
 def test_workspaces_could_be_parsed(
     mock_workspaces_ok: mock.Mock,
     mock_get_ws_paths: mock.Mock,
-    mock_read_package_from: mock.Mock,
+    rooted_tmp_path: RootedPath,
 ) -> None:
-    mock_read_package_from.side_effect = [{"workspaces": ["quux"]}, {"name": "inner_package"}]
-    mock_get_ws_paths.return_value = [Path("/tmp/foo/bar")]
-    package_path = RootedPath("/tmp/foo")
+    package_json_path = rooted_tmp_path.join_within_root("package.json")
+    package_json_path.path.write_text('{"name": "outer_package", "workspaces": ["foo"]}')
+
+    workspace_path = rooted_tmp_path.join_within_root("foo")
+    workspace_path.path.mkdir()
+    workspace_package_json_path = workspace_path.join_within_root("package.json")
+    workspace_package_json_path.path.write_text('{"name": "inner_package"}')
+
+    mock_get_ws_paths.return_value = [workspace_path.path]
 
     expected_result = [
         Workspace(
-            path="/tmp/foo/bar",
-            package_contents={"name": "inner_package"},
+            path=workspace_path.path,
+            package_json=PackageJson.from_file(workspace_package_json_path),
         ),
     ]
-    result = extract_workspace_metadata(package_path)
+    result = extract_workspace_metadata(rooted_tmp_path)
 
     assert result == expected_result