2 added 2301 characters in body
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It's Simple like you just need to Copy 2.2.6 Version Composer.JsonOpen your root composer.Json and replace whole code with 2below.2

{
    "name": "magento/project-community-edition",
    "description": "eCommerce Platform for Growth (Community Edition)",
    "type": "project",
    "version": "2.2.6",
    "license": [
        "OSL-3.0",
        "AFL-3.0"
    ],
    "require": {
        "magento/product-community-edition": "2.2.6",
        "composer/composer": "@alpha"
    },
    "require-dev": {
        "phpunit/phpunit": "~6.2.0",
        "squizlabs/php_codesniffer": "3.2.2",
        "phpmd/phpmd": "@stable",
        "pdepend/pdepend": "2.5.2",
        "friendsofphp/php-cs-fixer": "~2.2.1",
        "lusitanian/oauth": "~0.8.10",
        "sebastian/phpcpd": "2.0.4"
    },
    "autoload": {
        "psr-4": {
            "Magento\\Framework\\": "lib/internal/Magento/Framework/",
            "Magento\\Setup\\": "setup/src/Magento/Setup/",
            "Magento\\": "app/code/Magento/"
        },
        "psr-0": {
            "": [
                "app/code/",
                "generated/code/"
            ]
        },
        "files": [
            "app/etc/NonComposerComponentRegistration.php"
        ],
        "exclude-from-classmap": [
            "**/dev/**",
            "**/update/**",
            "**/Test/**"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Magento\\Sniffs\\": "dev/tests/static/framework/Magento/Sniffs/",
            "Magento\\Tools\\": "dev/tools/Magento/Tools/",
            "Magento\\Tools\\Sanity\\": "dev/build/publication/sanity/Magento/Tools/Sanity/",
            "Magento\\TestFramework\\Inspection\\": "dev/tests/static/framework/Magento/TestFramework/Inspection/",
            "Magento\\TestFramework\\Utility\\": "dev/tests/static/framework/Magento/TestFramework/Utility/"
        }
    },
    "minimum-stability": "stable",
    "repositories": [
        {
            "type": "composer",
            "url": "https://repo.magento.com/"
        }
    ],
    "extra": {
        "magento-force": "override"
    }
}

After update composer.5 version then Runjson need to run below command.

 composer update
 php bin/magento s:up
 php bin/magento s:s:d -f
 php bin/magento c:c
 rm -rf var/cache/* generated/*

Note:: If you have uploaded any extension using composer command then you need to add lib in a composer.json

It's Simple like you just need to Copy 2.2.6 Version Composer.Json replace with 2.2.5 version then Run below command

 composer update
 php bin/magento s:up
 php bin/magento s:s:d -f
 rm -rf var/cache/* generated/*

Open your root composer.Json and replace whole code with below.

{
    "name": "magento/project-community-edition",
    "description": "eCommerce Platform for Growth (Community Edition)",
    "type": "project",
    "version": "2.2.6",
    "license": [
        "OSL-3.0",
        "AFL-3.0"
    ],
    "require": {
        "magento/product-community-edition": "2.2.6",
        "composer/composer": "@alpha"
    },
    "require-dev": {
        "phpunit/phpunit": "~6.2.0",
        "squizlabs/php_codesniffer": "3.2.2",
        "phpmd/phpmd": "@stable",
        "pdepend/pdepend": "2.5.2",
        "friendsofphp/php-cs-fixer": "~2.2.1",
        "lusitanian/oauth": "~0.8.10",
        "sebastian/phpcpd": "2.0.4"
    },
    "autoload": {
        "psr-4": {
            "Magento\\Framework\\": "lib/internal/Magento/Framework/",
            "Magento\\Setup\\": "setup/src/Magento/Setup/",
            "Magento\\": "app/code/Magento/"
        },
        "psr-0": {
            "": [
                "app/code/",
                "generated/code/"
            ]
        },
        "files": [
            "app/etc/NonComposerComponentRegistration.php"
        ],
        "exclude-from-classmap": [
            "**/dev/**",
            "**/update/**",
            "**/Test/**"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Magento\\Sniffs\\": "dev/tests/static/framework/Magento/Sniffs/",
            "Magento\\Tools\\": "dev/tools/Magento/Tools/",
            "Magento\\Tools\\Sanity\\": "dev/build/publication/sanity/Magento/Tools/Sanity/",
            "Magento\\TestFramework\\Inspection\\": "dev/tests/static/framework/Magento/TestFramework/Inspection/",
            "Magento\\TestFramework\\Utility\\": "dev/tests/static/framework/Magento/TestFramework/Utility/"
        }
    },
    "minimum-stability": "stable",
    "repositories": [
        {
            "type": "composer",
            "url": "https://repo.magento.com/"
        }
    ],
    "extra": {
        "magento-force": "override"
    }
}

After update composer.json need to run below command.

 composer update
 php bin/magento s:up
 php bin/magento s:s:d -f
 php bin/magento c:c
 rm -rf var/cache/* generated/*

Note:: If you have uploaded any extension using composer command then you need to add lib in a composer.json

1
source | link

It's Simple like you just need to Copy 2.2.6 Version Composer.Json replace with 2.2.5 version then Run below command

 composer update
 php bin/magento s:up
 php bin/magento s:s:d -f
 rm -rf var/cache/* generated/*