diff --git a/application/common.php b/application/common.php
index b7b12a9..00c32ca 100644
--- a/application/common.php
+++ b/application/common.php
@@ -792,7 +792,7 @@ function my_doiToFrag2($data)
         // $year = $math[0];
         // $qbj=trim(substr($frag,0,stripos($frag,$year))) ;
         if (mb_substr_count($frag, '.') != 3) {
-            $f = $frag . " Available at: " . PHP_EOL . "http://doi.org/" . $data['refer_doi'];
+            $f = $frag . " Available at: " . PHP_EOL . "https://doi.org/" . $data['refer_doi'];
             $update['refer_type'] = "other";
             $update['refer_frag'] = $f;
             $update['cs'] = 1;
@@ -809,7 +809,7 @@ function my_doiToFrag2($data)
             $update['refer_type'] = "journal";
             $update['is_ja'] = $joura == trim($bj[0]) ? 0 : 1;
             $update['dateno'] = str_replace(' ', '', str_replace('-', '–', trim($bj[1])));
-            $update['doilink'] = strpos($data['refer_doi'],"http")===false?"http://doi.org/" . $data['refer_doi']:$data['refer_doi'];
+            $update['doilink'] = strpos($data['refer_doi'],"http")===false?"https://doi.org/" . $data['refer_doi']:$data['refer_doi'];
             $update['cs'] = 1;
         }
     }