diff --git a/public/locales/en-US/dashboard.json b/public/locales/en-US/dashboard.json
index 5f3b9ee..16baa5f 100644
--- a/public/locales/en-US/dashboard.json
+++ b/public/locales/en-US/dashboard.json
@@ -437,6 +437,8 @@
     "capKeyIDDes": "The key ID from your Cap server dashboard.",
     "capKeySecret": "Key Secret",
     "capKeySecretDes": "The key secret from your Cap server dashboard.",
+    "capVersion": "Cap Version",
+    "capVersionDes": "Select the version of your Cap server (1.x for legacy compatibility, 2.x for latest features).",
     "captchaProvider": "Captcha provider",
     "captchaWidth": "Width",
     "captchaHeight": "Height",
diff --git a/public/locales/ja-JP/dashboard.json b/public/locales/ja-JP/dashboard.json
index 3ffa102..cf3393c 100644
--- a/public/locales/ja-JP/dashboard.json
+++ b/public/locales/ja-JP/dashboard.json
@@ -435,6 +435,8 @@
     "capKeyIDDes": "Cap サーバーダッシュボードから取得したキー ID。",
     "capKeySecret": "キーシークレット",
     "capKeySecretDes": "Cap サーバーダッシュボードから取得したキーシークレット。",
+    "capVersion": "Cap バージョン",
+    "capVersionDes": "Cap サーバーのバージョンを選択してください（1.x は旧バージョン互換、2.x は最新機能）。",
     "captchaProvider": "認証コードタイプ",
     "captchaWidth": "幅",
     "captchaHeight": "高さ",
diff --git a/public/locales/zh-CN/dashboard.json b/public/locales/zh-CN/dashboard.json
index cba5119..e5a1460 100644
--- a/public/locales/zh-CN/dashboard.json
+++ b/public/locales/zh-CN/dashboard.json
@@ -435,6 +435,8 @@
     "capKeyIDDes": "从 Cap 服务器控制面板获取的密钥 ID。",
     "capKeySecret": "密钥密码",
     "capKeySecretDes": "从 Cap 服务器控制面板获取的密钥密码。",
+    "capVersion": "Cap 版本",
+    "capVersionDes": "选择你的 Cap 服务器版本（1.x 用于兼容旧版本，2.x 为最新版本）。",
     "captchaProvider": "验证码类型",
     "captchaWidth": "宽度",
     "captchaHeight": "高度",
diff --git a/public/locales/zh-TW/dashboard.json b/public/locales/zh-TW/dashboard.json
index e25dc8f..a3e2515 100644
--- a/public/locales/zh-TW/dashboard.json
+++ b/public/locales/zh-TW/dashboard.json
@@ -432,6 +432,8 @@
     "capKeyIDDes": "從 Cap 伺服器控制面板獲取的金鑰 ID。",
     "capKeySecret": "金鑰密碼",
     "capKeySecretDes": "從 Cap 伺服器控制面板獲取的金鑰密碼。",
+    "capVersion": "Cap 版本",
+    "capVersionDes": "選擇你的 Cap 伺服器版本（1.x 用於相容舊版本，2.x 為最新版本）。",
     "captchaProvider": "驗證碼型別",
     "captchaWidth": "寬度",
     "captchaHeight": "高度",
diff --git a/src/api/site.ts b/src/api/site.ts
index aecb4fd..ed12332 100644
--- a/src/api/site.ts
+++ b/src/api/site.ts
@@ -26,6 +26,7 @@ export interface SiteConfig {
   captcha_cap_instance_url?: string;
   captcha_cap_key_id?: string;
   captcha_cap_key_secret?: string;
+  captcha_cap_version?: string;
   register_enabled?: boolean;
   logo?: string;
   logo_light?: string;
diff --git a/src/component/Admin/Settings/Captcha/CapCaptcha.tsx b/src/component/Admin/Settings/Captcha/CapCaptcha.tsx
index d6c27dd..0055cc8 100644
--- a/src/component/Admin/Settings/Captcha/CapCaptcha.tsx
+++ b/src/component/Admin/Settings/Captcha/CapCaptcha.tsx
@@ -1,5 +1,5 @@
 import { Trans, useTranslation } from "react-i18next";
-import { FormControl, Link, Stack } from "@mui/material";
+import { FormControl, Link, Stack, MenuItem, Select, InputLabel } from "@mui/material";
 import SettingForm from "../../../Pages/Setting/SettingForm.tsx";
 import { DenseFilledTextField } from "../../../Common/StyledComponents.tsx";
 import * as React from "react";
@@ -16,6 +16,24 @@ const CapCaptcha = ({ values, setSettings }: CapCaptchaProps) => {
   const { t } = useTranslation("dashboard");
   return (
     <Stack spacing={3}>
+      <SettingForm title={t("settings.capVersion")} lgWidth={5}>
+        <FormControl fullWidth>
+          <InputLabel>{t("settings.capVersion")}</InputLabel>
+          <Select
+            value={values.captcha_cap_version || "1.x"}
+            onChange={(e) =>
+              setSettings({
+                captcha_cap_version: e.target.value,
+              })
+            }
+            label={t("settings.capVersion")}
+          >
+            <MenuItem value="1.x">1.x (Legacy)</MenuItem>
+            <MenuItem value="2.x">2.x (Latest)</MenuItem>
+          </Select>
+          <NoMarginHelperText>{t("settings.capVersionDes")}</NoMarginHelperText>
+        </FormControl>
+      </SettingForm>
       <SettingForm title={t("settings.capInstanceURL")} lgWidth={5}>
         <FormControl fullWidth>
           <DenseFilledTextField
diff --git a/src/component/Common/Captcha/CapCaptcha.tsx b/src/component/Common/Captcha/CapCaptcha.tsx
index 2f4d87a..dc8d3d1 100644
--- a/src/component/Common/Captcha/CapCaptcha.tsx
+++ b/src/component/Common/Captcha/CapCaptcha.tsx
@@ -22,6 +22,7 @@ const CapCaptcha = ({ onStateChange, generation, fullWidth, ...rest }: CapProps
 
   const capInstanceURL = useAppSelector((state) => state.siteConfig.basic.config.captcha_cap_instance_url);
   const capKeyID = useAppSelector((state) => state.siteConfig.basic.config.captcha_cap_key_id);
+  const capVersion = useAppSelector((state) => state.siteConfig.basic.config.captcha_cap_version);
 
   // Keep callback reference up to date
   useEffect(() => {
@@ -87,7 +88,18 @@ const CapCaptcha = ({ onStateChange, generation, fullWidth, ...rest }: CapProps
 
     if (typeof window !== "undefined" && (window as any).Cap) {
       const widget = document.createElement("cap-widget");
-      widget.setAttribute("data-cap-api-endpoint", `${capInstanceURL.replace(/\/$/, "")}/${capKeyID}/api/`);
+
+      // Build API endpoint based on Cap version
+      let apiEndpoint;
+      if (capVersion === "1.x") {
+        // Version 1.x: {instanceURL}/api/{keyID}/
+        apiEndpoint = `${capInstanceURL.replace(/\/$/, "")}/api/${capKeyID}/`;
+      } else {
+        // Version 2.x (default): {instanceURL}/{siteKey}/
+        apiEndpoint = `${capInstanceURL.replace(/\/$/, "")}/${capKeyID}/`;
+      }
+
+      widget.setAttribute("data-cap-api-endpoint", apiEndpoint);
       widget.id = "cap-widget";
 
       // Set internationalization attributes (Cap official i18n format)
@@ -117,7 +129,7 @@ const CapCaptcha = ({ onStateChange, generation, fullWidth, ...rest }: CapProps
     if (generation > 0) {
       createWidget();
     }
-  }, [generation, t]);
+  }, [generation, capVersion, t]);
 
   useEffect(() => {
     if (!capInstanceURL || !capKeyID) {
@@ -163,7 +175,7 @@ const CapCaptcha = ({ onStateChange, generation, fullWidth, ...rest }: CapProps
         captchaRef.current.innerHTML = "";
       }
     };
-  }, [capInstanceURL, capKeyID, t]);
+  }, [capInstanceURL, capKeyID, capVersion, t]);
 
   if (!capInstanceURL || !capKeyID) {
     return null;