diff --git a/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.test.ts b/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.test.ts
index ee11f6323..a68a1d52f 100644
--- a/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.test.ts
+++ b/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.test.ts
@@ -101,6 +101,14 @@ describe("useChatTitleGenerator", () => {
         title: "Fix login bug",
       });
     });
+    expect(mockSetQueriesData).toHaveBeenCalledWith(
+      { queryKey: ["tasks", "list"] },
+      expect.any(Function),
+    );
+    expect(mockSetQueriesData).toHaveBeenCalledWith(
+      { queryKey: ["tasks", "summaries"] },
+      expect.any(Function),
+    );
   });
 
   it.each([
diff --git a/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.ts b/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.ts
index 048436046..22f748019 100644
--- a/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.ts
+++ b/apps/code/src/renderer/features/sessions/hooks/useChatTitleGenerator.ts
@@ -4,6 +4,7 @@ import {
   sessionStoreSetters,
   useSessionStore,
 } from "@features/sessions/stores/sessionStore";
+import type { Schemas } from "@renderer/api/generated";
 import type { Task } from "@shared/types";
 import {
   enrichDescriptionWithFileContent,
@@ -88,6 +89,13 @@ export function useChatTitleGenerator(taskId: string): void {
                     task.id === taskId ? { ...task, title } : task,
                   ),
               );
+              queryClient.setQueriesData<Schemas.TaskSummary[]>(
+                { queryKey: ["tasks", "summaries"] },
+                (old) =>
+                  old?.map((task) =>
+                    task.id === taskId ? { ...task, title } : task,
+                  ),
+              );
               getSessionService().updateSessionTaskTitle(taskId, title);
               log.debug("Updated task title from conversation", {
                 taskId,
diff --git a/apps/code/src/renderer/features/sidebar/components/SidebarMenu.tsx b/apps/code/src/renderer/features/sidebar/components/SidebarMenu.tsx
index 05fb194af..8edd66f80 100644
--- a/apps/code/src/renderer/features/sidebar/components/SidebarMenu.tsx
+++ b/apps/code/src/renderer/features/sidebar/components/SidebarMenu.tsx
@@ -18,6 +18,7 @@ import { useWorkspaces } from "@features/workspace/hooks/useWorkspace";
 import { useTaskContextMenu } from "@hooks/useTaskContextMenu";
 import { ScrollArea, Separator } from "@posthog/quill";
 import { Box, Flex } from "@radix-ui/themes";
+import type { Schemas } from "@renderer/api/generated";
 import type { Task } from "@shared/types";
 import { useNavigationStore } from "@stores/navigationStore";
 import { useRendererWindowFocusStore } from "@stores/rendererWindowFocusStore";
@@ -273,6 +274,13 @@ function SidebarMenuComponent() {
               : task,
           ),
       );
+      queryClient.setQueriesData<Schemas.TaskSummary[]>(
+        { queryKey: ["tasks", "summaries"] },
+        (old) =>
+          old?.map((task) =>
+            task.id === taskId ? { ...task, title: newTitle } : task,
+          ),
+      );
 
       // Sync to session store so notifications use the updated title
       getSessionService().updateSessionTaskTitle(taskId, newTitle);
@@ -286,6 +294,7 @@ function SidebarMenuComponent() {
         log.error("Failed to rename task", error);
         // Refetch to revert optimistic update on failure
         queryClient.invalidateQueries({ queryKey: ["tasks", "list"] });
+        queryClient.invalidateQueries({ queryKey: ["tasks", "summaries"] });
       }
     },
     [setEditingTaskId, updateTask, queryClient, log],
diff --git a/apps/code/src/renderer/features/tasks/hooks/useTasks.ts b/apps/code/src/renderer/features/tasks/hooks/useTasks.ts
index 07c5f7e6b..32491e6b5 100644
--- a/apps/code/src/renderer/features/tasks/hooks/useTasks.ts
+++ b/apps/code/src/renderer/features/tasks/hooks/useTasks.ts
@@ -136,6 +136,9 @@ export function useUpdateTask() {
       onSuccess: (_, { taskId }) => {
         queryClient.invalidateQueries({ queryKey: taskKeys.lists() });
         queryClient.invalidateQueries({ queryKey: taskKeys.detail(taskId) });
+        queryClient.invalidateQueries({
+          queryKey: [...taskKeys.all, "summaries"],
+        });
       },
     },
   );