diff --git a/CHANGELOG.md b/CHANGELOG.md
index 812a18b..58447fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog - project.linkedcorp.net
 
+## [1.12.4] - 2026-09-14
+### Added
+- Botón "Editar" (lápiz) en cada tarea de una actividad — el backend ya soportaba renombrar una
+  tarea (`PUT /api/tasks/:id`), solo faltaba el botón en la UI. Edición en línea (input + guardar
+  con Enter o el ícono, cancelar con Escape o el ícono).
+
 ## [1.12.3] - 2026-09-14
 ### Added
 - Fecha del documento en la lista de Documentos (proyecto/actividad) — el dato ya lo devolvía el
diff --git a/VERSION b/VERSION
index 81f3632..89c881b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.12.3
+1.12.4
diff --git a/backend/package.json b/backend/package.json
index 870bb22..cc4a2c3 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "project-linkedcorp-backend",
-  "version": "1.12.3",
+  "version": "1.12.4",
   "private": true,
   "type": "module",
   "main": "src/server.js",
diff --git a/frontend/package.json b/frontend/package.json
index 8332969..1f75507 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "project-linkedcorp-frontend",
   "private": true,
-  "version": "1.12.3",
+  "version": "1.12.4",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx b/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
index ae7e18c..eb174f4 100644
--- a/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
+++ b/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
@@ -3,7 +3,7 @@ import { Pencil, Save, X, Plus, Trash2, Link2, Repeat } from 'lucide-react';
 import { useUi } from '../../context/ui-context.jsx';
 import { useAsync, useAction } from '../../hooks/useAsync.js';
 import { updateActivity, addDependency, removeDependency } from '../../services/activities.js';
-import { listTasks, createTask, setTaskDone, deleteTask } from '../../services/tasks.js';
+import { listTasks, createTask, updateTask, setTaskDone, deleteTask } from '../../services/tasks.js';
 import { promoteTaskToRecurring } from '../../services/recurringTasks.js';
 import { listCatalog } from '../../services/catalogs.js';
 import { listUsers } from '../../services/users.js';
@@ -39,6 +39,8 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
   const [editing, setEditing] = useState(false);
   const [form, setForm] = useState(() => toForm(activity));
   const [newTask, setNewTask] = useState('');
+  const [editingTaskId, setEditingTaskId] = useState(null);
+  const [editingTaskName, setEditingTaskName] = useState('');
   const [addingDep, setAddingDep] = useState('');
   const [promoting, setPromoting] = useState(null);
   const [promoteForm, setPromoteForm] = useState(null);
@@ -80,6 +82,26 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
     await runAction(async () => { await deleteTask(task.id); await reloadTasks(); onChanged(); });
   }
 
+  function startEditTask(task) {
+    setEditingTaskId(task.id);
+    setEditingTaskName(task.name);
+  }
+
+  function cancelEditTask() {
+    setEditingTaskId(null);
+    setEditingTaskName('');
+  }
+
+  async function saveEditTask() {
+    if (!editingTaskName.trim()) return;
+    await runAction(async () => {
+      await updateTask(editingTaskId, { name: editingTaskName.trim() });
+      cancelEditTask();
+      await reloadTasks();
+      onChanged();
+    });
+  }
+
   function startPromote(task) {
     setPromoting(task);
     setPromoteForm({
@@ -208,10 +230,25 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
         <div>
           {(tasks || []).map((task) => (
             <div key={task.id} style={{ display: 'flex', alignItems: 'center', gap: 8, padding: '5px 0' }}>
-              <input type="checkbox" checked={!!task.is_done} onChange={() => toggleTask(task)} />
-              <span style={{ flex: 1, fontSize: '.8rem', textDecoration: task.is_done ? 'line-through' : 'none', opacity: task.is_done ? .6 : 1 }}>{task.name}</span>
-              <button className="icon-btn" title={t('recurring_task_promote')} onClick={() => startPromote(task)}><Repeat size={15} /></button>
-              <button className="icon-btn" onClick={() => removeTaskItem(task)}><Trash2 size={15} /></button>
+              {editingTaskId === task.id ? (
+                <>
+                  <input
+                    className="input" style={{ flex: 1 }} value={editingTaskName} autoFocus
+                    onChange={(e) => setEditingTaskName(e.target.value)}
+                    onKeyDown={(e) => { if (e.key === 'Enter') saveEditTask(); if (e.key === 'Escape') cancelEditTask(); }}
+                  />
+                  <button className="icon-btn" title={t('common_save')} onClick={saveEditTask}><Save size={15} /></button>
+                  <button className="icon-btn" title={t('common_cancel')} onClick={cancelEditTask}><X size={15} /></button>
+                </>
+              ) : (
+                <>
+                  <input type="checkbox" checked={!!task.is_done} onChange={() => toggleTask(task)} />
+                  <span style={{ flex: 1, fontSize: '.8rem', textDecoration: task.is_done ? 'line-through' : 'none', opacity: task.is_done ? .6 : 1 }}>{task.name}</span>
+                  <button className="icon-btn" title={t('common_edit')} onClick={() => startEditTask(task)}><Pencil size={15} /></button>
+                  <button className="icon-btn" title={t('recurring_task_promote')} onClick={() => startPromote(task)}><Repeat size={15} /></button>
+                  <button className="icon-btn" onClick={() => removeTaskItem(task)}><Trash2 size={15} /></button>
+                </>
+              )}
             </div>
           ))}
           {(!tasks || tasks.length === 0) && <div className="text-muted" style={{ fontSize: '.78rem' }}>{t('common_empty')}</div>}