diff --git a/packages/vant/src/locale/README.md b/packages/vant/src/locale/README.md
index 2e7d8ee80..bccc76e19 100644
--- a/packages/vant/src/locale/README.md
+++ b/packages/vant/src/locale/README.md
@@ -48,6 +48,7 @@ Current supported languages:
 | German (formal)          | de-DE-formal | -        |
 | Greek                    | el-GR        | `v3.5.0` |
 | English                  | en-US        | -        |
+| Esperanto                | eo-EO        | `v4.0.9` |
 | Spanish (Spain)          | es-ES        | -        |
 | Farsi                    | fa-IR        | `v3.5.0` |
 | French                   | fr-FR        | -        |
diff --git a/packages/vant/src/locale/README.zh-CN.md b/packages/vant/src/locale/README.zh-CN.md
index 767d4a8ab..296219149 100644
--- a/packages/vant/src/locale/README.zh-CN.md
+++ b/packages/vant/src/locale/README.zh-CN.md
@@ -49,6 +49,7 @@ Locale.add(messages);
 | 德语（正式）         | de-DE-formal | -        |
 | 希腊语               | el-GR        | `v3.5.0` |
 | 英语                 | en-US        | -        |
+| 世界语               | eo-EO        | `v4.0.9` |
 | 西班牙语             | es-ES        | -        |
 | 波斯语               | fa-IR        | `v3.5.0` |
 | 法语                 | fr-FR        | -        |
diff --git a/packages/vant/src/locale/lang/eo_EO.ts b/packages/vant/src/locale/lang/eo-EO.ts
similarity index 100%
rename from packages/vant/src/locale/lang/eo_EO.ts
rename to packages/vant/src/locale/lang/eo-EO.ts