diff --git a/middleware/captcha.go b/middleware/captcha.go
index 8c55ded..9169d5f 100644
--- a/middleware/captcha.go
+++ b/middleware/captcha.go
@@ -147,24 +147,11 @@ func CaptchaRequired(enabled func(c *gin.Context) bool) gin.HandlerFunc {
 					request2.WithHeader(http.Header{"Content-Type": []string{"application/json"}}),
 				)
 
-				var capEndpoint string
-				var requestBody map[string]string
-
-				// Support both 1.x and 2.x API formats
-				if captchaSetting.Version == "1.x" {
-					// Version 1.x: /api/{keyID}/siteverify
-					capEndpoint = strings.TrimSuffix(captchaSetting.InstanceURL, "/") + "/api/" + captchaSetting.SiteKey + "/siteverify"
-					requestBody = map[string]string{
-						"secret":   captchaSetting.SecretKey,
-						"response": service.Ticket,
-					}
-				} else {
-					// Version 2.x (default): /{siteKey}/siteverify
-					capEndpoint = strings.TrimSuffix(captchaSetting.InstanceURL, "/") + "/" + captchaSetting.SiteKey + "/siteverify"
-					requestBody = map[string]string{
-						"secret":   captchaSetting.SecretKey,
-						"response": service.Ticket,
-					}
+				// Cap 2.0 API format: /{siteKey}/siteverify
+				capEndpoint := strings.TrimSuffix(captchaSetting.InstanceURL, "/") + "/" + captchaSetting.SiteKey + "/siteverify"
+				requestBody := map[string]string{
+					"secret":   captchaSetting.SecretKey,
+					"response": service.Ticket,
 				}
 				requestData, err := json.Marshal(requestBody)
 				if err != nil {
diff --git a/pkg/setting/provider.go b/pkg/setting/provider.go
index 71271ab..1fdb03f 100644
--- a/pkg/setting/provider.go
+++ b/pkg/setting/provider.go
@@ -671,7 +671,6 @@ func (s *settingProvider) CapCaptcha(ctx context.Context) *Cap {
 		InstanceURL: s.getString(ctx, "captcha_cap_instance_url", ""),
 		SiteKey:     s.getString(ctx, "captcha_cap_key_id", ""),
 		SecretKey:   s.getString(ctx, "captcha_cap_key_secret", ""),
-		Version:     s.getString(ctx, "captcha_cap_version", "1.x"),
 	}
 }
 
diff --git a/pkg/setting/types.go b/pkg/setting/types.go
index e74193e..69ecfba 100644
--- a/pkg/setting/types.go
+++ b/pkg/setting/types.go
@@ -52,7 +52,6 @@ type Cap struct {
 	InstanceURL string
 	SiteKey     string
 	SecretKey   string
-	Version     string // "1.x" or "2.x"
 }
 
 type SMTP struct {
diff --git a/service/basic/site.go b/service/basic/site.go
index 8f006a5..779f374 100644
--- a/service/basic/site.go
+++ b/service/basic/site.go
@@ -31,7 +31,6 @@ type SiteConfig struct {
 	TurnstileSiteID  string              `json:"turnstile_site_id,omitempty"`
 	CapInstanceURL   string              `json:"captcha_cap_instance_url,omitempty"`
 	CapKeyID         string              `json:"captcha_cap_key_id,omitempty"`
-	CapVersion       string              `json:"captcha_cap_version,omitempty"`
 	RegisterEnabled  bool                `json:"register_enabled,omitempty"`
 	TosUrl           string              `json:"tos_url,omitempty"`
 	PrivacyPolicyUrl string              `json:"privacy_policy_url,omitempty"`
@@ -139,7 +138,6 @@ func (s *GetSettingService) GetSiteConfig(c *gin.Context) (*SiteConfig, error) {
 		ReCaptchaKey:    reCaptcha.Key,
 		CapInstanceURL:  capCaptcha.InstanceURL,
 		CapKeyID:        capCaptcha.SiteKey,
-		CapVersion:      capCaptcha.Version,
 		AppPromotion:    appSetting.Promotion,
 	}, nil
 }