diff --git a/.claude/settings.local.json.template b/.claude/settings.local.json.template
index c1fe321c..06b86a73 100644
--- a/.claude/settings.local.json.template
+++ b/.claude/settings.local.json.template
@@ -8,7 +8,7 @@
   "hooks": {
     "PreToolUse": [
       {
-        "matcher": "Bash|Write|Edit",
+        "matcher": "Bash|Write|Edit|Replace",
         "hooks": [
           {
             "type": "command",
@@ -20,7 +20,7 @@
     ],
     "PostToolUse": [
       {
-        "matcher": "Write|Edit",
+        "matcher": "Write|Edit|Replace",
         "hooks": [
           {
             "type": "command",
diff --git a/scripts/deploy-hooks.js b/scripts/deploy-hooks.js
index b6a4df14..bd4f8e1d 100644
--- a/scripts/deploy-hooks.js
+++ b/scripts/deploy-hooks.js
@@ -84,17 +84,43 @@ function deployTo(targetDir) {
   if (fs.existsSync(templateSrc)) {
     copyFile(templateSrc, path.join(targetClaude, SETTINGS_TEMPLATE));
 
-    // settings.local.json を生成 (テンプレートの {{PROJECT_DIR}} を置換)
+    // settings.local.json を生成 (hooks のみ更新、既存 permissions 等は保持)
     const template = fs.readFileSync(templateSrc, "utf8");
     const resolved = template.replace(
       /\{\{PROJECT_DIR\}\}/g,
       targetDir.replace(/\\/g, "\\\\")
     );
-    fs.writeFileSync(
-      path.join(targetClaude, "settings.local.json"),
-      resolved
-    );
-    console.log("  generated: settings.local.json");
+    const newSettings = JSON.parse(resolved);
+    if (
+      !newSettings ||
+      typeof newSettings !== "object" ||
+      Array.isArray(newSettings) ||
+      !newSettings.hooks ||
+      typeof newSettings.hooks !== "object" ||
+      Array.isArray(newSettings.hooks)
+    ) {
+      throw new Error("Invalid settings template: `hooks` object is required");
+    }
+    const settingsDest = path.join(targetClaude, "settings.local.json");
+
+    if (fs.existsSync(settingsDest)) {
+      try {
+        const parsed = JSON.parse(fs.readFileSync(settingsDest, "utf8"));
+        const existing =
+          parsed && typeof parsed === "object" && !Array.isArray(parsed)
+            ? parsed
+            : {};
+        existing.hooks = newSettings.hooks;
+        fs.writeFileSync(settingsDest, JSON.stringify(existing, null, 2) + "\n");
+        console.log("  updated: settings.local.json (hooks merged, permissions preserved)");
+      } catch {
+        fs.writeFileSync(settingsDest, JSON.stringify(newSettings, null, 2) + "\n");
+        console.log("  WARN: existing settings.local.json was invalid, regenerated");
+      }
+    } else {
+      fs.writeFileSync(settingsDest, JSON.stringify(newSettings, null, 2) + "\n");
+      console.log("  generated: settings.local.json");
+    }
   }
 
   return true;