diff --git a/gitlab/mixins.py b/gitlab/mixins.py
index c02f4c027..fa426aa8d 100644
--- a/gitlab/mixins.py
+++ b/gitlab/mixins.py
@@ -527,7 +527,7 @@ def _get_updated_data(self) -> Dict[str, Any]:
 
         return updated_data
 
-    def save(self, **kwargs: Any) -> None:
+    def save(self, **kwargs: Any) -> Optional[Dict[str, Any]]:
         """Save the changes made to the object to the server.
 
         The object is updated to match what the server returns.
@@ -542,15 +542,18 @@ def save(self, **kwargs: Any) -> None:
         updated_data = self._get_updated_data()
         # Nothing to update. Server fails if sent an empty dict.
         if not updated_data:
-            return
+            return None
 
         # call the manager
         obj_id = self.get_id()
         if TYPE_CHECKING:
             assert isinstance(self.manager, UpdateMixin)
+        if isinstance(obj_id, str):
+            obj_id = utils._url_encode(obj_id)
         server_data = self.manager.update(obj_id, updated_data, **kwargs)
         if server_data is not None:
             self._update_attrs(server_data)
+        return server_data
 
 
 class ObjectDeleteMixin(_RestObjectBase):
diff --git a/tests/functional/api/test_wikis.py b/tests/functional/api/test_wikis.py
new file mode 100644
index 000000000..26ac244ec
--- /dev/null
+++ b/tests/functional/api/test_wikis.py
@@ -0,0 +1,15 @@
+"""
+GitLab API:
+https://docs.gitlab.com/ee/api/wikis.html
+"""
+
+
+def test_wikis(project):
+
+    page = project.wikis.create({"title": "title/subtitle", "content": "test content"})
+    page.content = "update content"
+    page.title = "subtitle"
+
+    page.save()
+
+    page.delete()