diff --git a/.changeset/gantt-config-passthrough.md b/.changeset/gantt-config-passthrough.md
new file mode 100644
index 0000000000..3959f029a6
--- /dev/null
+++ b/.changeset/gantt-config-passthrough.md
@@ -0,0 +1,15 @@
+---
+"@objectstack/spec": patch
+---
+
+fix(spec): make `GanttConfigSchema` forward-compatible via `.passthrough()`.
+
+The gantt renderer (objectui plugin-gantt) keeps adding view-config knobs
+(e.g. `lockField`, `defaultCollapsedDepth`) ahead of this schema. Without
+passthrough, the console — which validates the view config against a bundled
+copy of this schema before handing it to the renderer — strips any field not
+declared here, so every new renderer knob needs a spec release + console
+rebuild before it can take effect. Adding `.passthrough()` lets unknown fields
+flow through to the renderer, decoupling renderer releases from spec releases.
+Known fields keep their validation; the renderer still only reads what it
+understands.
diff --git a/packages/spec/src/ui/view.test.ts b/packages/spec/src/ui/view.test.ts
index cb39c124f8..646f40d5ec 100644
--- a/packages/spec/src/ui/view.test.ts
+++ b/packages/spec/src/ui/view.test.ts
@@ -237,6 +237,20 @@ describe('GanttConfigSchema', () => {
     expect(() => GanttConfigSchema.parse(config)).not.toThrow();
     expect(GanttConfigSchema.parse(config)).toMatchObject({ parentField: 'parent_id', typeField: 'row_type' });
   });
+
+  it('should passthrough unknown renderer fields ahead of this schema', () => {
+    const config = {
+      startDateField: 'start_date',
+      endDateField: 'end_date',
+      titleField: 'name',
+      // Newer renderer knobs not yet declared here (e.g. objectui plugin-gantt).
+      lockField: 'is_locked',
+      defaultCollapsedDepth: 2,
+    };
+
+    expect(() => GanttConfigSchema.parse(config)).not.toThrow();
+    expect(GanttConfigSchema.parse(config)).toMatchObject({ lockField: 'is_locked', defaultCollapsedDepth: 2 });
+  });
 });
 
 describe('ListViewSchema', () => {
diff --git a/packages/spec/src/ui/view.zod.ts b/packages/spec/src/ui/view.zod.ts
index f769f86898..7c5e5261c5 100644
--- a/packages/spec/src/ui/view.zod.ts
+++ b/packages/spec/src/ui/view.zod.ts
@@ -427,7 +427,11 @@ export const GanttConfigSchema = lazySchema(() => z.object({
   ])).optional().describe('Fields to surface in the hover tooltip, in display order'),
   quickFilters: z.array(GanttQuickFilterSchema).optional().describe('Multi-select filter dropdowns rendered above the chart'),
   autoZoomToFilter: z.boolean().optional().describe('When true (default), filtering zooms the range to the filtered tasks'),
-}));
+// Forward-compatible: the gantt renderer (objectui plugin-gantt) keeps adding
+// config knobs (e.g. lockField / defaultCollapsedDepth) ahead of this schema.
+// Passthrough lets those extra fields reach the renderer instead of being
+// stripped here, so a renderer release no longer has to wait on a spec release.
+}).passthrough());
 
 /**
  * Navigation Mode Enum