diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48769cd..d42e858 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 ----
 
-## 3.0.0-alpha.6 (2022-09-21)
+## 3.0.0-alpha.7 (2023-11-20)
+
+- feat: dynamic import optional dependencies.
+
+## 3.0.0-alpha.6 (2023-11-12)
 
 - feat: support [Intl.Segmenter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Segmenter) for segment.
 - dict: 雪茄
diff --git a/babel.config.js b/babel.config.js
index 325997f..8301a4c 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -1,7 +1,7 @@
 module.exports = {
   presets: [
-    [ '@babel/preset-env', {targets: {node: 'current'}} ],
-    [ '@babel/preset-typescript', {allExtensions: true}],
+    [ "@babel/preset-env", {targets: {node: "current"}} ],
+    [ "@babel/preset-typescript", {allExtensions: true}],
   ],
-  'compact': true,
+  "compact": true,
 };
diff --git a/package.json b/package.json
index 2ab1c7c..78a5c37 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pinyin",
-  "version": "3.0.0-alpha.6",
+  "version": "3.0.0-alpha.7",
   "description": "汉语拼音转换工具。",
   "main": "./lib/pinyin.js",
   "module": "./esm/pinyin.js",
diff --git a/src/segment.ts b/src/segment.ts
index 9435df9..e39cc19 100644
--- a/src/segment.ts
+++ b/src/segment.ts
@@ -1,7 +1,3 @@
-import nodejieba from "nodejieba";
-import { load, cut /*, tag */ } from "@node-rs/jieba";
-// @ts-ignore
-import { Segment, useDefault } from "segmentit";
 import type { IPinyinSegment } from "./declare";
 
 let nodeRsJiebaLoaded = false; // @node-rs/jieba 加载词典。
@@ -13,41 +9,50 @@ let hansIntlSegmenter: any; // Intl.Segmenter
  * 分词并标注词性。
  */
 export function segment(hans: string, segment?: IPinyinSegment): string[] {
-  // @node-rs/jieba (Rust)
-  if (segment === "@node-rs/jieba") {
-    if (!nodeRsJiebaLoaded) {
-      nodeRsJiebaLoaded = true;
-      load();
+  try {
+    // @node-rs/jieba (Rust)
+    if (segment === "@node-rs/jieba") {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      const { load, cut /*, tag */ } = require("@node-rs/jieba");
+      if (!nodeRsJiebaLoaded) {
+        nodeRsJiebaLoaded = true;
+        load();
+      }
+      return cut(hans, false);
+      // return tag(hans);
     }
-    return cut(hans, false);
-    // return tag(hans);
-  }
 
-  // segmentit (Node.js)
-  if (segment === "segmentit") {
-    if (!segmentit) {
-      segmentit = useDefault(new Segment());
+    // segmentit (Node.js)
+    if (segment === "segmentit") {
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      const { Segment, useDefault } = require("segmentit");
+      if (!segmentit) {
+        segmentit = useDefault(new Segment());
+      }
+      return segmentit.doSegment(hans, {
+        simple: true,
+      });
     }
-    return segmentit.doSegment(hans, {
-      simple: true,
-    });
-  }
 
-  // Intl.Segmenter
-  if (segment === "Intl.Segmenter") {
-    if (typeof Intl?.Segmenter === "function") {
-      if (!hansIntlSegmenter) {
-        hansIntlSegmenter = new Intl.Segmenter("zh-Hans-CN", {
-          granularity: "word",
-        });
+    // Intl.Segmenter
+    if (segment === "Intl.Segmenter") {
+      if (typeof Intl?.Segmenter === "function") {
+        if (!hansIntlSegmenter) {
+          hansIntlSegmenter = new Intl.Segmenter("zh-Hans-CN", {
+            granularity: "word",
+          });
+        }
+        return [...hansIntlSegmenter.segment(hans)].map((s) => s.segment);
       }
-      return [...hansIntlSegmenter.segment(hans)].map((s) => s.segment);
     }
-  }
 
-  // 默认使用 nodejieba (C++)
-  // return nodejieba.tag(hans);
-  // nodejieba 定义的类型返回值错误，先忽略。
-  // @ts-ignore
-  return nodejieba.cutSmall(hans, 4);
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const nodejieba = require("nodejieba");
+    // 默认使用 nodejieba (C++)
+    // return nodejieba.tag(hans);
+    // nodejieba 定义的类型返回值错误，先忽略。
+    return nodejieba.cutSmall(hans, 4) as unknown as string[];
+  } catch (ex) {
+    return [hans];
+  }
 }