diff --git a/.htaccess b/.htaccess
index 99d25b71e..16ffb0902 100644
--- a/.htaccess
+++ b/.htaccess
@@ -8,10 +8,7 @@ php_value   upload_max_filesize   5M
 php_value   post_max_size         6M
 php_value   memory_limit          64M
 
-php_flag    register_globals            Off
 php_flag    zlib.output_compression     Off
-php_flag    magic_quotes_gpc            Off
-php_flag    magic_quotes_runtime        Off
 php_flag    suhosin.session.encrypt     Off
 
 #php_value   session.cookie_path     /
diff --git a/installer/check.php b/installer/check.php
index 674277471..8dfa3b37a 100644
--- a/installer/check.php
+++ b/installer/check.php
@@ -44,15 +44,12 @@ $ini_checks = array(
     'session.auto_start'            => 0,
     'mbstring.func_overload'        => 0,
     'suhosin.session.encrypt'       => 0,
-    'magic_quotes_runtime'          => 0,
-    'magic_quotes_sybase'           => 0,
 );
 
 $optional_checks = array(
     // required for utils/modcss.inc, should we require this?
     'allow_url_fopen'  => 1,
     'date.timezone'    => '-VALID-',
-    'register_globals' => 0, // #1489157
 );
 
 $source_urls = array(
@@ -89,7 +86,7 @@ echo '<input type="hidden" name="_step" value="' . ($RCI->configured ? 3 : 2) .
 <h3>Checking PHP version</h3>
 <?php
 
-define('MIN_PHP_VERSION', '5.3.7');
+define('MIN_PHP_VERSION', '5.4.0');
 if (version_compare(PHP_VERSION, MIN_PHP_VERSION, '>=')) {
     $RCI->pass('Version', 'PHP ' . PHP_VERSION . ' detected');
 } else {
diff --git a/program/lib/Roundcube/bootstrap.php b/program/lib/Roundcube/bootstrap.php
index 65685d96e..b5283374a 100644
--- a/program/lib/Roundcube/bootstrap.php
+++ b/program/lib/Roundcube/bootstrap.php
@@ -30,8 +30,6 @@ $config = array(
     // critical PHP settings here. Only these, which doesn't provide
     // an error/warning in the logs later. See (#1486307).
     'mbstring.func_overload'  => 0,
-    'magic_quotes_runtime'    => false,
-    'magic_quotes_sybase'     => false, // #1488506
 );
 
 // check these additional ini settings if not called via CLI
diff --git a/program/lib/Roundcube/rcube_utils.php b/program/lib/Roundcube/rcube_utils.php
index f5b80b12c..66d735852 100644
--- a/program/lib/Roundcube/rcube_utils.php
+++ b/program/lib/Roundcube/rcube_utils.php
@@ -314,11 +314,6 @@ class rcube_utils
             return $value;
         }
 
-        // strip slashes if magic_quotes enabled
-        if (get_magic_quotes_gpc() || get_magic_quotes_runtime()) {
-            $value = stripslashes($value);
-        }
-
         // remove HTML tags if not allowed
         if (!$allow_html) {
             $value = strip_tags($value);
diff --git a/program/steps/utils/html2text.inc b/program/steps/utils/html2text.inc
index 251eaf7c4..20869da12 100644
--- a/program/steps/utils/html2text.inc
+++ b/program/steps/utils/html2text.inc
@@ -21,11 +21,6 @@
 
 $html = stream_get_contents(fopen('php://input', 'r'));
 
-// strip slashes if magic_quotes enabled
-if (get_magic_quotes_gpc() || get_magic_quotes_runtime()) {
-    $html = stripslashes($html);
-}
-
 $params['links'] = (bool) rcube_utils::get_input_value('_do_links', rcube_utils::INPUT_GET);
 $params['width'] = (int) rcube_utils::get_input_value('_width', rcube_utils::INPUT_GET);
 
diff --git a/program/steps/utils/text2html.inc b/program/steps/utils/text2html.inc
index fdfb69621..6b964b776 100644
--- a/program/steps/utils/text2html.inc
+++ b/program/steps/utils/text2html.inc
@@ -21,11 +21,6 @@
 
 $text = stream_get_contents(fopen('php://input', 'r'));
 
-// strip slashes if magic_quotes enabled
-if (get_magic_quotes_gpc() || get_magic_quotes_runtime()) {
-    $html = stripslashes($html);
-}
-
 $converter = new rcube_text2html($text, false, array('wrap' => true));
 
 header('Content-Type: text/html; charset=' . RCUBE_CHARSET);