diff --git a/admin/environment.xml b/admin/environment.xml
index 4ed9863efe9..f87521126df 100644
--- a/admin/environment.xml
+++ b/admin/environment.xml
@@ -1914,7 +1914,7 @@
     <DATABASE level="required">
       <VENDOR name="mariadb" version="5.5.31" />
       <VENDOR name="mysql" version="5.5.31" />
-      <VENDOR name="postgres" version="9.1" />
+      <VENDOR name="postgres" version="9.3" />
       <VENDOR name="mssql" version="10.0" />
       <VENDOR name="oracle" version="10.2" />
     </DATABASE>
@@ -1941,9 +1941,9 @@
           <ON_ERROR message="curlrequired" />
         </FEEDBACK>
       </PHP_EXTENSION>
-      <PHP_EXTENSION name="openssl" level="optional">
+      <PHP_EXTENSION name="openssl" level="required">
         <FEEDBACK>
-          <ON_CHECK message="opensslrecommended" />
+          <ON_ERROR message="opensslrequired" />
         </FEEDBACK>
       </PHP_EXTENSION>
       <PHP_EXTENSION name="tokenizer" level="optional">
@@ -2068,6 +2068,16 @@
           <ON_ERROR message="unsupporteddblargeprefix" />
         </FEEDBACK>
       </CUSTOM_CHECK>
+      <CUSTOM_CHECK file="lib/upgradelib.php" function="check_is_https" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="ishttpswarning" />
+        </FEEDBACK>
+      </CUSTOM_CHECK>
+      <CUSTOM_CHECK file="lib/upgradelib.php" function="check_mysql_incomplete_unicode_support" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="incompleteunicodesupport" />
+        </FEEDBACK>
+      </CUSTOM_CHECK>
     </CUSTOM_CHECKS>
   </MOODLE>
 </COMPATIBILITY_MATRIX>
diff --git a/lang/en/admin.php b/lang/en/admin.php
index e56047e97b7..5698dc087c1 100644
--- a/lang/en/admin.php
+++ b/lang/en/admin.php
@@ -599,6 +599,7 @@ $string['iplookupinfo'] = 'By default Moodle uses the free online NetGeo (The In
 It is recommended to install local copy of free GeoLite City database from MaxMind.<br />
 IP address location is displayed on simple map or using Google Maps. Please note that you need to have a Google account and apply for free Google Maps API key to enable interactive maps.';
 $string['iplookupmaxmindnote'] = 'This product includes GeoLite data created by MaxMind, available from <a href="http://www.maxmind.com/">http://www.maxmind.com/</a>.';
+$string['ishttpswarning'] = 'It has been detected that your site is not secured using HTTPS. For increased security and improved integrations with other systems is highly recommended to migrate your site to HTTPS.';
 $string['keeptagnamecase'] = 'Keep tag name casing';
 $string['lang'] = 'Default language';
 $string['langcache'] = 'Cache language menu';
@@ -769,6 +770,7 @@ $string['numberofmissingstrings'] = 'Number of missing strings: {$a}';
 $string['numberofstrings'] = 'Total number of strings: {$a->strings}<br />Missing: {$a->missing} ({$a->missingpercent}&nbsp;%)';
 $string['opcacherecommended'] = 'PHP opcode caching improves performance and lowers memory requirements, OPcache extension is recommended and fully supported.';
 $string['opensslrecommended'] = 'Installing the optional OpenSSL library is highly recommended -- it enables Moodle Networking functionality.';
+$string['opensslrequired'] = 'The OpenSSL PHP extension is now required by Moodle to provide stronger cryptographic services.';
 $string['opentogoogle'] = 'Open to Google';
 $string['optionalmaintenancemessage'] = 'Optional maintenance message';
 $string['order1'] = 'First';
diff --git a/lib/upgradelib.php b/lib/upgradelib.php
index ab65f2d5bf1..03afa73f00f 100644
--- a/lib/upgradelib.php
+++ b/lib/upgradelib.php
@@ -2240,6 +2240,27 @@ function check_mysql_incomplete_unicode_support(environment_results $result) {
     return null;
 }
 
+/**
+ * Check if the site is being served using an ssl url.
+ *
+ * Note this does not really perform any request neither looks for proxies or
+ * other situations. Just looks to wwwroot and warn if it's not using https.
+ *
+ * @param  environment_results $result $result
+ * @return environment_results|null updated results object, or null if the site is https.
+ */
+function check_is_https(environment_results $result) {
+    global $CFG;
+
+    // Only if is defined, non-empty and whatever core tell us.
+    if (!empty($CFG->wwwroot) && !is_https()) {
+        $result->setInfo('site not https');
+        $result->setStatus(false);
+        return $result;
+    }
+    return null;
+}
+
 /**
  * Upgrade the minmaxgrade setting.
  *