diff --git a/admin/environment.xml b/admin/environment.xml
index b420be3d5f0..3492941c23d 100644
--- a/admin/environment.xml
+++ b/admin/environment.xml
@@ -2094,7 +2094,7 @@
       <VENDOR name="mssql" version="10.0" />
       <VENDOR name="oracle" version="10.2" />
     </DATABASE>
-    <PHP version="5.6.5" level="required">
+    <PHP version="7.0.0" level="required">
     </PHP>
     <PCREUNICODE level="optional">
       <FEEDBACK>
@@ -2172,9 +2172,9 @@
       </PHP_EXTENSION>
       <PHP_EXTENSION name="xmlreader" level="required">
       </PHP_EXTENSION>
-      <PHP_EXTENSION name="intl" level="optional">
+      <PHP_EXTENSION name="intl" level="required">
         <FEEDBACK>
-          <ON_CHECK message="intlrecommended" />
+          <ON_ERROR message="intlrequired" />
         </FEEDBACK>
       </PHP_EXTENSION>
       <PHP_EXTENSION name="json" level="required">
diff --git a/lang/en/admin.php b/lang/en/admin.php
index dca2305d5fe..64b41324631 100644
--- a/lang/en/admin.php
+++ b/lang/en/admin.php
@@ -616,6 +616,7 @@ $string['indexinginfo'] = 'The recommended way to index your site\'s contents is
 $string['installhijacked'] = 'Installation must be finished from the original IP address, sorry.';
 $string['installsessionerror'] = 'Can not initialise PHP session, please verify that your browser accepts cookies.';
 $string['intlrecommended'] = 'Intl extension is used to improve internationalization support, such as locale aware sorting.';
+$string['intlrequired'] = 'Intl extension is required to improve internationalization support, such as locale aware sorting and international domain names.';
 $string['invalidsection'] = 'Invalid section.';
 $string['invaliduserchangeme'] = 'Username "changeme" is reserved -- you cannot create an account with it.';
 $string['ipblocked'] = 'This site is not available currently.';
diff --git a/lib/phpminimumversionlib.php b/lib/phpminimumversionlib.php
index 38284efb3ca..7beeac0e393 100644
--- a/lib/phpminimumversionlib.php
+++ b/lib/phpminimumversionlib.php
@@ -48,8 +48,8 @@ function moodle_minimum_php_version_is_met($haltexecution = false) {
     // PLEASE NOTE THIS FUNCTION MUST BE COMPATIBLE WITH OLD UNSUPPORTED VERSIONS OF PHP.
     // Do not use modern php features or Moodle convenience functions (e.g. localised strings).
 
-    $minimumversion = '5.6.5';
-    $moodlerequirementchanged = '3.2';
+    $minimumversion = '7.0.0';
+    $moodlerequirementchanged = '3.4';
 
     if (version_compare(PHP_VERSION, $minimumversion) < 0) {
         if ($haltexecution) {