diff --git a/app/captcha.php b/app/captcha.php
index 038d77b..066b7ab 100644
--- a/app/captcha.php
+++ b/app/captcha.php
@@ -30,14 +30,15 @@ $font_size = 24;
 
 /*字体文件位置*/
 $fontfile = APP_ROOT . $config['textFont'];
+/* floor() 修复php>8.0精度丢失 v2.8.4 */
 for ($i = 0; $i < $count; $i++) {
     $font_color = imagecolorallocate($img, mt_rand(0, 100), mt_rand(0, 50), mt_rand(0, 255));
     imagettftext(
         $img,
         $font_size,
-        mt_rand(0, 20) - mt_rand(0, 25),
-        ($img_w * $i / 4) + mt_rand(0, 15),
-        mt_rand($img_h / 2, $img_h),
+        floor(mt_rand(0, 20) - mt_rand(0, 25)),
+        floor($img_w * $i / 4) + floor(mt_rand(0, 15)),
+        floor(mt_rand($img_h / 2, $img_h)),
         $font_color,
         realpath($fontfile),
         $code[$i]
diff --git a/docs/update.md b/docs/update.md
index 8900443..2772ab1 100644
--- a/docs/update.md
+++ b/docs/update.md
@@ -1,6 +1,7 @@
 * 2024-01-20 v2.8.4
 - Fix [#163](https://github.com/icret/EasyImages2.0/pull/163)
-- 增加检测FTP
+- Fix [#159](https://github.com/icret/EasyImages2.0/pull/159)
+- 增加上传至FTP
 - 增加自定义时区
 - 增加大文件分片上传
 - 增加重置OPcache缓存