diff --git a/config/captcha.php b/config/captcha.php
index 162db3d..a640364 100644
--- a/config/captcha.php
+++ b/config/captcha.php
@@ -28,8 +28,8 @@ return [
         ],
     ],
     'image_head' => [
-        'width' => 150,
-        'height' => 40,
+        'width' => 500,
+        'height' => 75,
         'text_padding_top'  => 5,
         'text_padding_left' => 10,
         'backgrounds' => [
@@ -86,8 +86,8 @@ return [
         'line_colors' => [],
     ],
     'image_body' => [
-        'width' => 300,
-        'height' => 240,
+        'width' => 500,
+        'height' => 500,
         'backgrounds' => [
             resource_path('captcha/backgrounds-body/1.jpg'),
             resource_path('captcha/backgrounds-body/2.jpg'),