diff --git a/vendor/composer/installed.json b/vendor/composer/installed.json
index 2a815509a..235fad98e 100644
--- a/vendor/composer/installed.json
+++ b/vendor/composer/installed.json
@@ -401,12 +401,12 @@
         "source": {
             "type": "git",
             "url": "https://github.com/zoujingli/ThinkLibrary.git",
-            "reference": "df2aa0872d2da7d3b37dd76f0816500c15280626"
+            "reference": "7f20352fb92f249f64f9299cfdb9eda386adca86"
         },
         "dist": {
             "type": "zip",
-            "url": "https://api.github.com/repos/zoujingli/ThinkLibrary/zipball/df2aa0872d2da7d3b37dd76f0816500c15280626",
-            "reference": "df2aa0872d2da7d3b37dd76f0816500c15280626",
+            "url": "https://api.github.com/repos/zoujingli/ThinkLibrary/zipball/7f20352fb92f249f64f9299cfdb9eda386adca86",
+            "reference": "7f20352fb92f249f64f9299cfdb9eda386adca86",
             "shasum": "",
             "mirrors": [
                 {
@@ -426,7 +426,7 @@
             "qiniu/php-sdk": "^7.2",
             "topthink/framework": "5.1.*"
         },
-        "time": "2019-11-27T12:45:33+00:00",
+        "time": "2019-11-28T03:18:19+00:00",
         "type": "library",
         "installation-source": "dist",
         "autoload": {
diff --git a/vendor/zoujingli/think-library/src/service/CaptchaService.php b/vendor/zoujingli/think-library/src/service/CaptchaService.php
index 96872b871..c56dd6231 100644
--- a/vendor/zoujingli/think-library/src/service/CaptchaService.php
+++ b/vendor/zoujingli/think-library/src/service/CaptchaService.php
@@ -146,7 +146,11 @@ class CaptchaService extends Service
         $_x = $this->width / $this->codelen;
         for ($i = 0; $i < $this->codelen; $i++) {
             $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
-            imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
+            if (function_exists('imagettftext')) {
+                imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
+            } else {
+                imagestring($this->img, 15, $_x * $i + mt_rand(0, 25), mt_rand(15, 20), $this->code[$i], $this->fontcolor);
+            }
         }
         ob_start();
         imagepng($this->img);
diff --git a/vendor/zoujingli/think-library/src/service/ProcessService.php b/vendor/zoujingli/think-library/src/service/ProcessService.php
index e58fbd923..5fa8f5a6e 100644
--- a/vendor/zoujingli/think-library/src/service/ProcessService.php
+++ b/vendor/zoujingli/think-library/src/service/ProcessService.php
@@ -55,7 +55,7 @@ class ProcessService extends Service
         if ($this->iswin()) {
             $this->exec(__DIR__ . "/bin/console.exe {$command}");
         } else {
-            $this->exec("{$command} &");
+            $this->exec("{$command} > /dev/null &");
         }
         return $this;
     }