diff --git a/app/bot.php b/app/bot.php
index 61fbd39..c8c92b4 100644
--- a/app/bot.php
+++ b/app/bot.php
@@ -605,6 +605,7 @@ class Bot
             $this->shutdownClient();
             $this->checkVersion();
             $this->checkBackup();
+            $this->checkCert();
             sleep(10);
         }
     }
@@ -675,6 +676,23 @@ class Bot
         }
     }
 
+    public function checkCert()
+    {
+        try {
+            require __DIR__ . '/config.php';
+            if (!empty($c['admin']) && (empty($this->time2) || ((time() - $this->time2) > 3600))) {
+                $this->time2 = time();
+                $cert = $this->expireCert();
+                if (!empty($cert) && $cert - 60 * 60 * 24 * 14 < time()) {
+                    foreach ($c['admin'] as $k => $v) {
+                        $this->send($v, "certificate expire: " . date('Y-m-d H:i:s', $cert));
+                    }
+                }
+            }
+        } catch (Exception $e) {
+        }
+    }
+
     public function getTime(int $seconds)
     {
         $seconds = ($seconds - time()) > 0 ? $seconds - time() : 0;
@@ -2867,6 +2885,12 @@ DNS-over-HTTPS with IP:
         ];
     }
 
+    public function expireCert()
+    {
+        $c = openssl_x509_read(file_get_contents("/certs/cert_public"));
+        return openssl_x509_parse($c)["validTo_time_t"] ?: false;
+    }
+
     public function configMenu()
     {
         $conf = $this->getPacConf();
@@ -2885,7 +2909,7 @@ DNS-over-HTTPS with IP:
                     case 'letsencrypt':
                         $data[] = [
                             [
-                                'text'          => $this->i18n('renew SSL'),
+                                'text'          => $this->i18n('renew SSL') . ': ' . date('Y-m-d H:i:s', $this->expireCert()),
                                 'callback_data' => "/setSSL letsencrypt",
                             ],
                             [
diff --git a/dockerfile/php.dockerfile b/dockerfile/php.dockerfile
index 16f001f..7ab06d4 100644
--- a/dockerfile/php.dockerfile
+++ b/dockerfile/php.dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18.2
 RUN apk add --no-cache --update php81 \
     php81-mbstring \
     php81-session \
diff --git a/version b/version
index 110b555..b5e2497 100644
--- a/version
+++ b/version
@@ -1,3 +1,6 @@
+17.11.2023 уведомление о скорой просрочке сертификата
+<code>git pull</code>
+<code>make r</code>
 12.11.2023 AdGuardHome latest docker image
 <code>git pull</code>
 <code>make r</code>