diff --git a/prompt-profiles.js b/prompt-profiles.js
index 0490533..8e52307 100644
--- a/prompt-profiles.js
+++ b/prompt-profiles.js
@@ -443,6 +443,19 @@ function getDefaultTaskProfileTemplate(taskType) {
   return cloneJson(template);
 }
 
+function getDefaultTaskProfileTemplateStamp(taskType) {
+  const template = getDefaultTaskProfileTemplate(taskType);
+  return {
+    version: Number.isFinite(Number(template?.version))
+      ? Number(template.version)
+      : DEFAULT_TASK_PROFILE_VERSION,
+    updatedAt:
+      typeof template?.updatedAt === "string" && template.updatedAt
+        ? template.updatedAt
+        : "",
+  };
+}
+
 function buildDefaultTaskBlockTripletsFromTemplate(taskType) {
   const template = getDefaultTaskProfileTemplate(taskType);
   const blocks = Array.isArray(template?.blocks) ? template.blocks : [];
@@ -775,8 +788,45 @@ function mergeDefaultTaskProfileBlocks(taskType, existingBlocks = []) {
   return [...merged, ...extraBlocks];
 }
 
+function shouldRefreshBuiltinDefaultProfile(taskType, profile = {}) {
+  if (String(profile?.id || "") !== DEFAULT_PROFILE_ID || profile?.builtin === false) {
+    return false;
+  }
+
+  const expectedStamp = getDefaultTaskProfileTemplateStamp(taskType);
+  const metadata = profile?.metadata || {};
+  const currentVersion = Number.isFinite(Number(metadata?.defaultTemplateVersion))
+    ? Number(metadata.defaultTemplateVersion)
+    : Number.isFinite(Number(profile?.version))
+      ? Number(profile.version)
+      : 0;
+  const currentUpdatedAt =
+    typeof metadata?.defaultTemplateUpdatedAt === "string"
+      ? metadata.defaultTemplateUpdatedAt
+      : "";
+
+  if (currentVersion < expectedStamp.version) {
+    return true;
+  }
+
+  if (
+    expectedStamp.updatedAt &&
+    currentUpdatedAt &&
+    currentUpdatedAt !== expectedStamp.updatedAt
+  ) {
+    return true;
+  }
+
+  if (expectedStamp.updatedAt && !currentUpdatedAt) {
+    return true;
+  }
+
+  return false;
+}
+
 function createFallbackDefaultTaskProfile(taskType) {
   const legacyPromptField = LEGACY_PROMPT_FIELD_MAP[taskType];
+  const templateStamp = getDefaultTaskProfileTemplateStamp(taskType);
   return {
     id: DEFAULT_PROFILE_ID,
     name: "默认预设",
@@ -834,6 +884,8 @@ function createFallbackDefaultTaskProfile(taskType) {
     metadata: {
       migratedFromLegacy: false,
       legacyPromptField,
+      defaultTemplateVersion: templateStamp.version,
+      defaultTemplateUpdatedAt: templateStamp.updatedAt,
     },
   };
 }
@@ -846,6 +898,7 @@ export function createDefaultTaskProfile(taskType) {
 
   const legacyPromptField = LEGACY_PROMPT_FIELD_MAP[taskType];
   const fallback = createFallbackDefaultTaskProfile(taskType);
+  const templateStamp = getDefaultTaskProfileTemplateStamp(taskType);
   return {
     ...fallback,
     ...template,
@@ -891,6 +944,8 @@ export function createDefaultTaskProfile(taskType) {
       ...(template?.metadata || {}),
       migratedFromLegacy: false,
       legacyPromptField,
+      defaultTemplateVersion: templateStamp.version,
+      defaultTemplateUpdatedAt: templateStamp.updatedAt,
     },
   };
 }
@@ -985,13 +1040,25 @@ export function ensureTaskProfiles(settings = {}) {
   for (const taskType of TASK_TYPES) {
     const current = existing[taskType] || {};
     const defaultBucket = defaults[taskType];
-    const profiles =
+    let profiles =
       Array.isArray(current.profiles) && current.profiles.length > 0
         ? current.profiles.map((profile) =>
             normalizeTaskProfile(taskType, profile, settings),
           )
         : defaultBucket.profiles;
 
+    const defaultIndex = profiles.findIndex(
+      (profile) => String(profile?.id || "") === DEFAULT_PROFILE_ID,
+    );
+    if (defaultIndex >= 0 && shouldRefreshBuiltinDefaultProfile(taskType, profiles[defaultIndex])) {
+      const refreshedDefault = createDefaultTaskProfile(taskType);
+      profiles = [
+        ...profiles.slice(0, defaultIndex),
+        refreshedDefault,
+        ...profiles.slice(defaultIndex + 1),
+      ];
+    }
+
     const activeProfileId =
       typeof current.activeProfileId === "string" &&
       profiles.some((profile) => profile.id === current.activeProfileId)
diff --git a/tests/task-profile-migration.mjs b/tests/task-profile-migration.mjs
index 4f5a1f8..0186751 100644
--- a/tests/task-profile-migration.mjs
+++ b/tests/task-profile-migration.mjs
@@ -1,6 +1,7 @@
 import assert from "node:assert/strict";
 import {
   createDefaultTaskProfiles,
+  ensureTaskProfiles,
   getActiveTaskProfile,
   migrateLegacyTaskProfiles,
 } from "../prompt-profiles.js";
@@ -218,6 +219,119 @@ assert.equal(upgradedLegacyDefault.blocks[10].content, "保留我自己的输出
 assert.equal(upgradedLegacyDefault.blocks[11].content, "保留我自己的行为规则");
 assert.equal(upgradedLegacyDefault.blocks[10].role, "user");
 assert.equal(upgradedLegacyDefault.blocks[11].role, "user");
+
+const currentDefaults = createDefaultTaskProfiles();
+const currentDefaultExtract = currentDefaults.extract.profiles[0];
+
+const staleBuiltinDefaults = ensureTaskProfiles({
+  taskProfilesVersion: 3,
+  taskProfiles: {
+    extract: {
+      activeProfileId: "default",
+      profiles: [
+        {
+          ...currentDefaultExtract,
+          updatedAt: "2000-01-01T00:00:00.000Z",
+          blocks: currentDefaultExtract.blocks.map((block) =>
+            block.id === "default-role"
+              ? { ...block, content: "这是过期的默认角色定义" }
+              : block,
+          ),
+          metadata: {
+            ...(currentDefaultExtract.metadata || {}),
+            defaultTemplateVersion:
+              Number(currentDefaultExtract.metadata?.defaultTemplateVersion || 3),
+            defaultTemplateUpdatedAt: "2000-01-01T00:00:00.000Z",
+          },
+        },
+        {
+          id: "extract-custom-1",
+          taskType: "extract",
+          builtin: false,
+          name: "我的自定义预设",
+          promptMode: "block-based",
+          enabled: true,
+          updatedAt: "2026-04-05T00:00:00.000Z",
+          blocks: [
+            {
+              id: "custom-block-1",
+              name: "自定义块",
+              type: "custom",
+              enabled: true,
+              role: "system",
+              sourceKey: "",
+              sourceField: "",
+              content: "保留我的自定义内容",
+              injectionMode: "append",
+              order: 0,
+            },
+          ],
+          generation: { ...(currentDefaultExtract.generation || {}) },
+          regex: {
+            ...(currentDefaultExtract.regex || {}),
+            localRules: [],
+          },
+          metadata: {
+            note: "custom-profile-should-stay",
+          },
+        },
+      ],
+    },
+  },
+});
+const refreshedDefaultExtract = staleBuiltinDefaults.extract.profiles.find(
+  (profile) => profile.id === "default",
+);
+const preservedCustomExtract = staleBuiltinDefaults.extract.profiles.find(
+  (profile) => profile.id === "extract-custom-1",
+);
+
+assert.ok(refreshedDefaultExtract);
+assert.equal(
+  refreshedDefaultExtract.blocks.find((block) => block.id === "default-role")
+    ?.content,
+  currentDefaultExtract.blocks.find((block) => block.id === "default-role")
+    ?.content,
+);
+assert.equal(
+  refreshedDefaultExtract.metadata.defaultTemplateUpdatedAt,
+  currentDefaultExtract.metadata.defaultTemplateUpdatedAt,
+);
+assert.ok(preservedCustomExtract);
+assert.equal(
+  preservedCustomExtract.blocks[0].content,
+  "保留我的自定义内容",
+);
+
+const sameStampBuiltinDefault = ensureTaskProfiles({
+  taskProfilesVersion: 3,
+  taskProfiles: {
+    extract: {
+      activeProfileId: "default",
+      profiles: [
+        {
+          ...currentDefaultExtract,
+          blocks: currentDefaultExtract.blocks.map((block) =>
+            block.id === "default-role"
+              ? { ...block, content: "同版本下保留我的默认预设修改" }
+              : block,
+          ),
+          metadata: {
+            ...(currentDefaultExtract.metadata || {}),
+          },
+        },
+      ],
+    },
+  },
+});
+const sameStampDefaultExtract = sameStampBuiltinDefault.extract.profiles.find(
+  (profile) => profile.id === "default",
+);
+assert.equal(
+  sameStampDefaultExtract.blocks.find((block) => block.id === "default-role")
+    ?.content,
+  "同版本下保留我的默认预设修改",
+);
 assert.deepEqual(
   upgradedLegacyDefault.blocks
     .slice(6, 10)