diff --git a/core/modules/update/src/UpdateFetcher.php b/core/modules/update/src/UpdateFetcher.php
index e97870b..28cba15 100644
--- a/core/modules/update/src/UpdateFetcher.php
+++ b/core/modules/update/src/UpdateFetcher.php
@@ -59,6 +59,25 @@ public function __construct(ConfigFactoryInterface $config_factory, ClientInterf
    */
   public function fetchProjectData(array $project, $site_key = '') {
     $url = $this->buildFetchUrl($project, $site_key);
+    return $this->doRequestWithHTTPFallback($url, ['headers' => ['Accept' => 'text/xml']], TRUE);
+  }
+
+  /**
+   * Applies a GET request with a non https fallback.
+   *
+   * This method falls back to not https in case there was some certificate
+   * problem.
+   *
+   * @param string $url
+   *   The URL.
+   * @param array $options.
+   *   The guzzle client options.
+   * @param bool $with_non_ssl_fallback
+   *   Should the function callback to NON ssl.
+   *
+   * @return string
+   */
+  protected function doRequestWithHTTPFallback($url, array $options, $with_non_ssl_fallback) {
     $data = '';
     try {
       $data = (string) $this->httpClient
@@ -67,6 +86,11 @@ public function fetchProjectData(array $project, $site_key = '') {
     }
     catch (RequestException $exception) {
       watchdog_exception('update', $exception);
+
+      if ($with_non_ssl_fallback && strpos($exception->getMessage(), 'SSL certificate problem: Invalid') !== FALSE) {
+        $url = str_replace('https://', 'http', $url);
+        return $this->doRequestWithHTTPFallback($url, $options, FALSE);
+      }
     }
     return $data;
   }