diff --git a/INSTALL b/INSTALL
index dc089424a..e4ae1bd61 100644
--- a/INSTALL
+++ b/INSTALL
@@ -12,7 +12,7 @@ REQUIREMENTS
 * An IMAP, HTTP and SMTP server
 * .htaccess support allowing overrides for DirectoryIndex
 * PHP Version 7.3 or greater including:
-   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Filter, Ctype, Intl (required)
+   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Filter, Intl (required)
    - PHP PDO with driver for either MySQL, PostgreSQL or SQLite (required)
    - Iconv, Zip, Fileinfo, Exif (recommended)
    - LDAP for LDAP addressbook support (optional)
diff --git a/composer.json-dist b/composer.json-dist
index d97293403..5196db187 100644
--- a/composer.json-dist
+++ b/composer.json-dist
@@ -18,7 +18,7 @@
         "pear/net_sieve": "~1.4.5",
         "roundcube/plugin-installer": "~0.3.1",
         "roundcube/rtf-html-php": "~2.1",
-        "masterminds/html5": "~2.7.0",
+        "masterminds/html5": "~2.8.0",
         "bacon/bacon-qr-code": "^2.0.0",
         "guzzlehttp/guzzle": "^7.3.0"
     },
diff --git a/installer/check.php b/installer/check.php
index 2eb012baa..dd65118f7 100644
--- a/installer/check.php
+++ b/installer/check.php
@@ -29,7 +29,6 @@ $required_php_exts = [
     'Multibyte' => 'mbstring',
     'OpenSSL'   => 'openssl',
     'Filter'    => 'filter',
-    'Ctype'     => 'ctype',
 ];
 
 $optional_php_exts = [
@@ -88,7 +87,6 @@ $source_urls = [
     'XMLWriter' => 'https://www.php.net/manual/en/book.xmlwriter.php',
     'Zip'       => 'https://www.php.net/manual/en/book.zip.php',
     'Filter'    => 'https://www.php.net/manual/en/book.filter.php',
-    'Ctype'     => 'https://www.php.net/manual/en/book.ctype.php',
     'pdo_mysql'   => 'https://www.php.net/manual/en/ref.pdo-mysql.php',
     'pdo_pgsql'   => 'https://www.php.net/manual/en/ref.pdo-pgsql.php',
     'pdo_sqlite'  => 'https://www.php.net/manual/en/ref.pdo-sqlite.php',
diff --git a/program/lib/Roundcube/README.md b/program/lib/Roundcube/README.md
index caf0109f3..cce07febe 100644
--- a/program/lib/Roundcube/README.md
+++ b/program/lib/Roundcube/README.md
@@ -19,7 +19,7 @@ tasks:
 REQUIREMENTS
 ------------
 PHP Version 7.3 or greater including:
-   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Filter, Ctype, Intl (required)
+   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Filter, Intl (required)
    - PHP PDO with driver for either MySQL, PostgreSQL, or SQLite (required)
    - Iconv, Zip, Fileinfo, Exif (recommended)
    - LDAP for LDAP addressbook support (optional)