diff --git a/README.md b/README.md
index 6efa2c5c44..f9e660ee61 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,21 @@
 ## EspoCRM
 
-<a href='https://www.espocrm.com'>EspoCRM is an Open Source CRM</a> (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type. People, companies or opportunities - all in an easy and intuitive interface.
+[EspoCRM is an Open Source CRM](https://www.espocrm.com) (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type. People, companies or opportunities - all in an easy and intuitive interface.
 
-It's a web application with a frontend designed as a single page application based on backbone.js and a REST API backend written in PHP.
+It's a web application with a frontend designed as a single page application and REST API backend written in PHP.
 
-Download the latest release from our [website](https://www.espocrm.com).
+[Download](https://www.espocrm.com/download/) the latest release from our website.
 
 ### Requirements
 
 * PHP 7.2 and later (with pdo, json, gd, openssl, zip, imap, mbstring, curl extensions);
 * MySQL 5.7 (and later), or MariaDB 10.1 (and later).
 
-For more information about server configuration see [this article](https://www.espocrm.com/documentation/administration/server-configuration/).
+For more information about server configuration see [this article](https://docs.espocrm.com/administration/server-configuration/).
 
 ### Documentation
 
-Documentation for administrators, users and developers is available [here](https://www.espocrm.com/documentation/).
+Documentation for administrators, users and developers is available [here](https://docs.espocrm.com).
 
 ### How to report a bug
 
@@ -23,13 +23,13 @@ Create an issue [here](https://github.com/espocrm/espocrm/issues) or post on our
 
 ### How to install a stable version
 
-[Download](https://www.espocrm.com/download/) the latest version. See the [instructions](https://www.espocrm.com/documentation/administration/installation/) about installation.
+[Download](https://www.espocrm.com/download/) the latest version. See the [instructions](https://docs.espocrm.com/administration/installation/) about installation.
 
 ### Development
 
-* [Getting started](https://github.com/espocrm/documentation/blob/master/development/how-to-start.md)
-* [Running tests](https://github.com/espocrm/documentation/blob/master/development/tests.md)
-* [Making translation](https://github.com/espocrm/documentation/blob/master/development/translation.md)
+* [Getting started](https://docs.espocrm.com/development/how-to-start)
+* [Running tests](https://docs.espocrm.com/development/tests)
+* [Making translation](https://docs.espocrm.com/development/translation)
 
 ### How to contribute
 
diff --git a/SECURITY.md b/SECURITY.md
index e835ef2d23..5325e8d538 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -6,4 +6,4 @@ If you believe you have discovered a vulnerability in EspoCRM please contacts us
 
 ## Supported versions
 
-For severe vulnerabilities we provide fixes for 5 minor versions (the second number in the version string) back from the current stable version.
+For severe vulnerabilities we provide fixes for 2 minor versions (the second number in the version string) back from the current stable version. Separate patches or manual fix guidelines will be provided for more old versions.
diff --git a/application/Espo/Core/Console/Commands/Upgrade.php b/application/Espo/Core/Console/Commands/Upgrade.php
index 38d61c821a..8219e729c8 100644
--- a/application/Espo/Core/Console/Commands/Upgrade.php
+++ b/application/Espo/Core/Console/Commands/Upgrade.php
@@ -261,6 +261,8 @@ class Upgrade extends Base
 
         try {
             foreach ($stepList as $stepName) {
+                fwrite(\STDOUT, ".");
+
                 $upgradeManager = $this->getUpgradeManager(true);
                 $upgradeManager->runInstallStep($stepName, ['id' => $upgradeId]);
             }
@@ -277,8 +279,9 @@ class Upgrade extends Base
         $phpExecutablePath = $this->getPhpExecutablePath();
 
         foreach ($stepList as $stepName) {
-            $command = $phpExecutablePath . " command.php upgrade-step --step=". ucfirst($stepName) ." --id=". $upgradeId;
+            fwrite(\STDOUT, ".");
 
+            $command = $phpExecutablePath . " command.php upgrade-step --step=". ucfirst($stepName) ." --id=". $upgradeId;
             $shellResult = shell_exec($command);
             if ($shellResult !== 'true') {
                 $GLOBALS['log']->error('Upgrade Error: ' . $shellResult);
diff --git a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonArrayType.php b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonArrayType.php
index d963273004..36550886d4 100644
--- a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonArrayType.php
+++ b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonArrayType.php
@@ -29,7 +29,7 @@
 
 namespace Espo\Core\Utils\Database\DBAL\FieldTypes;
 
-class JsonArrayType extends \Doctrine\DBAL\Types\TextType
+class JsonArrayType extends TextType
 {
     const JSON_ARRAY = 'jsonArray';
 
@@ -37,10 +37,4 @@ class JsonArrayType extends \Doctrine\DBAL\Types\TextType
     {
         return self::JSON_ARRAY;
     }
-
-    public static function getDbTypeName()
-    {
-        return 'TEXT';
-    }
-
 }
diff --git a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonObjectType.php b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonObjectType.php
index f112af8d88..26daf8d5e0 100644
--- a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonObjectType.php
+++ b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/JsonObjectType.php
@@ -29,7 +29,7 @@
 
 namespace Espo\Core\Utils\Database\DBAL\FieldTypes;
 
-class JsonObjectType extends \Doctrine\DBAL\Types\TextType
+class JsonObjectType extends TextType
 {
     const JSON_OBJECT = 'jsonObject';
 
@@ -37,10 +37,4 @@ class JsonObjectType extends \Doctrine\DBAL\Types\TextType
     {
         return self::JSON_OBJECT;
     }
-
-    public static function getDbTypeName()
-    {
-        return 'TEXT';
-    }
-
 }
diff --git a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/LongtextType.php b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/LongtextType.php
new file mode 100644
index 0000000000..fb430322d6
--- /dev/null
+++ b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/LongtextType.php
@@ -0,0 +1,52 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Utils\Database\DBAL\FieldTypes;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+
+class LongtextType extends TextType
+{
+    const LONGTEXT = 'longtext';
+
+    public function getName()
+    {
+        return self::LONGTEXT;
+    }
+
+    public static function getDbTypeName()
+    {
+        return 'longtext';
+    }
+
+    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
+    {
+        return 'LONGTEXT';
+    }
+}
diff --git a/application/Espo/Core/Utils/Database/DBAL/FieldTypes/TextType.php b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/TextType.php
new file mode 100644
index 0000000000..9a9dd286b2
--- /dev/null
+++ b/application/Espo/Core/Utils/Database/DBAL/FieldTypes/TextType.php
@@ -0,0 +1,45 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Utils\Database\DBAL\FieldTypes;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+
+class TextType extends \Doctrine\DBAL\Types\TextType
+{
+    public static function getDbTypeName()
+    {
+        return 'mediumtext';
+    }
+
+    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
+    {
+        return 'MEDIUMTEXT';
+    }
+}
diff --git a/application/Espo/Core/Utils/Database/DBAL/Schema/Comparator.php b/application/Espo/Core/Utils/Database/DBAL/Schema/Comparator.php
index 30e88721f5..6a78e5fff3 100644
--- a/application/Espo/Core/Utils/Database/DBAL/Schema/Comparator.php
+++ b/application/Espo/Core/Utils/Database/DBAL/Schema/Comparator.php
@@ -39,6 +39,7 @@ class Comparator extends \Doctrine\DBAL\Schema\Comparator
     public function diffColumn(Column $column1, Column $column2)
     {
         $changedProperties = array();
+
         if ( $column1->getType() != $column2->getType() ) {
 
             //espo: fix problem with executing query for custom types
@@ -82,15 +83,6 @@ class Comparator extends \Doctrine\DBAL\Schema\Comparator
             }
         }
 
-        if ($column1->getType() instanceof \Doctrine\DBAL\Types\TextType) {
-            $length1 = $column1->getLength() ?: 16777215/* mediumtext length*/;
-            $length2 = $column2->getLength() ?: 16777215;
-
-            if ($length1 != -1 && $length2 != -1 && $length2 > $length1) {
-                $changedProperties[] = 'length';
-            }
-        }
-
         if ($column1->getType() instanceof \Doctrine\DBAL\Types\DecimalType) {
             if (($column1->getPrecision()?:10) != ($column2->getPrecision()?:10)) {
                 $changedProperties[] = 'precision';
@@ -124,7 +116,7 @@ class Comparator extends \Doctrine\DBAL\Schema\Comparator
 
         $changedProperties = array_merge($changedProperties, $diffKeys);
 
-        /** Espo: do not change a field length while changing other parameters */
+        /** Espo: do not change a field length downwards */
         if (!empty($changedProperties) && !in_array('length', $changedProperties) && $column1->getType() instanceof \Doctrine\DBAL\Types\StringType) {
             $length1 = $column1->getLength() ?: 255;
             $length2 = $column2->getLength() ?: 255;
@@ -134,6 +126,15 @@ class Comparator extends \Doctrine\DBAL\Schema\Comparator
                 $column2->setLength($length1);
             }
         }
+
+        if (in_array('type', $changedProperties) && $column1->getType() instanceof \Doctrine\DBAL\Types\TextType && isset($column1DbTypeName) && isset($column2DbTypeName)) {
+            $constName1 = '\Espo\Core\Utils\Database\DBAL\Platforms\MySqlPlatform::LENGTH_LIMIT_' . strtoupper($column1DbTypeName);
+            $constName2 = '\Espo\Core\Utils\Database\DBAL\Platforms\MySqlPlatform::LENGTH_LIMIT_' . strtoupper($column2DbTypeName);
+
+            if (defined($constName1) && defined($constName2) && constant($constName1) >= constant($constName2)) {
+                $changedProperties = array_diff($changedProperties, ['type']);
+            }
+        }
         /** Espo: end */
 
         return $changedProperties;
diff --git a/application/Espo/Core/Utils/Database/DBAL/Schema/MySqlSchemaManager.php b/application/Espo/Core/Utils/Database/DBAL/Schema/MySqlSchemaManager.php
index bd70317930..96e5fad554 100644
--- a/application/Espo/Core/Utils/Database/DBAL/Schema/MySqlSchemaManager.php
+++ b/application/Espo/Core/Utils/Database/DBAL/Schema/MySqlSchemaManager.php
@@ -209,7 +209,7 @@ class MySqlSchemaManager extends \Doctrine\DBAL\Schema\MySqlSchemaManager
             case 'text':
             case 'mediumtext':
             case 'longtext':
-                $length = $this->_platform->getClobTypeLength($dbType);
+                $length = null;
                 break;
             /* Espo: end */
         }
diff --git a/application/Espo/Core/Utils/Database/Schema/tables/preferences.php b/application/Espo/Core/Utils/Database/Schema/tables/preferences.php
index b6a5fe06fc..b777c52395 100644
--- a/application/Espo/Core/Utils/Database/Schema/tables/preferences.php
+++ b/application/Espo/Core/Utils/Database/Schema/tables/preferences.php
@@ -46,8 +46,7 @@ return [
                 'type' => 'id',
             ],
             'data' => [
-                'type' => 'text',
-                'len' => 16777216,
+                'type' => 'text'
             ]
         ]
     ],