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Unable to Update to latest core

Update from 8.5.0 to 8.5.1 is failing on one of my drupal instance. 

>composer update drupal/core --with-dependencies Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages.    Problem 1     - The requested package symfony/debug (locked at v4.0.6, required as ^3.4.0)  is satisfiable by symfony/debug[v4.0.6] but these conflict with your  requirements or minimum-stability.

What does this mean? What should I do?

PS: Please find below some more related information

>composer outdated consolidation/output-formatters       3.1.13       3.2.0 dflydev/dot-access-data               v1.1.0       v2.0.0 drupal/core                           8.5.0        8.5.1 drupal/metatag                        1.4.0        1.5.0 egulias/email-validator               1.2.14       2.1.3 guzzlehttp/guzzle                     6.3.0        6.3.2 nikic/php-parser                      v3.1.5       v4.0.1 psy/psysh                             v0.8.17      v0.8.18 symfony-cmf/routing                   1.4.1        2.0.3 symfony/config                        v3.4.6       v4.0.6 symfony/console                       v3.4.6       v4.0.6 symfony/dependency-injection          v3.4.6       v4.0.6 symfony/event-dispatcher              v3.4.6       v4.0.6 symfony/filesystem                    v3.4.6       v4.0.6 symfony/finder                        v3.4.6       v4.0.6 symfony/http-foundation               v3.4.6       v4.0.6 symfony/http-kernel                   v3.4.6       v4.0.6 symfony/process                       v3.4.6       v4.0.6 symfony/routing                       v3.4.6       v4.0.6 symfony/serializer                    v3.4.6       v4.0.6 symfony/translation                   v3.4.6       v4.0.6 symfony/validator                     v3.4.6       v4.0.6 symfony/var-dumper                    v3.4.6       v4.0.6 symfony/yaml                          v3.4.6       v4.0.6 twig/twig                             v1.35.2      v2.4.7

composer.json file:

    "name": "drupal/drupal",     "description": "Drupal is an open source content management platform powering millions of websites and applications.",     "type": "project",     "license": "GPL-2.0+",     "require": {         "composer/installers": "^1.0.24",         "wikimedia/composer-merge-plugin": "^1.4",         "drush/drush": "^9.2",         "drupal/ctools": "^3.0",         "drupal/devel": "^1.2",         "drupal/ds": "^3.1",         "drupal/conditional_fields": "^1.0@alpha",         "drupal/field_group": "^1.0",         "drupal/filefield_paths": "^1.0@beta",         "drupal/bootstrap_layouts": "^5.1",         "drupal/page_manager": "^4.0@beta",         "drupal/page_manager_ui": "^4.0@beta",         "drupal/magnific_popup": "^1.3",         "drupal/config_update": "^1.5",         "drupal/config_update_ui": "^1.5",         "drupal/duration_field": "^1.1",         "drupal/pathauto": "^1.1",         "drupal/token": "^1.1",         "drupal/metatag": "^1.4",         "drupal/bootstrap": "^3.10",         "drupal/features": "^3.7",         "drupal/admin_toolbar": "^1.23",         "drupal/linked_field": "^1.1",         "drupal/core": "^8.5",         "drupal/bootstrap_paragraphs": "^2.0@beta",         "drupal/entity_reference_revisions": "^1.4",         "drupal/paragraphs": "^1.2",         "drupal/eva": "^1.3",         "drupal/slick_views": "^1.0@RC",         "drupal/yaml_editor": "^1.0"     },     "replace": {     },     "minimum-stability": "dev",     "prefer-stable": true,     "config": {         "preferred-install": "dist",         "autoloader-suffix": "Drupal8"     },     "extra": {         "_readme": [             "By default Drupal loads the autoloader from ./vendor/autoload.php.",             "To change the autoloader you can edit ./autoload.php.",             "This file specifies the packages.drupal.org repository.",             "You can read more about this composer repository at:",             "https://www.drupal.org/node/2718229"         ],         "merge-plugin": {             "include": [                 "core/composer.json"             ],            ],             "recurse": false,             "replace": false,             "merge-extra": false         },         "installer-paths": {             "core": [                 "type:drupal-core"             ],             "modules/contrib/{$name}": [                 "type:drupal-module"             ],             "profiles/contrib/{$name}": [                 "type:drupal-profile"             ],             "themes/contrib/{$name}": [                 "type:drupal-theme"             ],             "drush/contrib/{$name}": [                 "type:drupal-drush"             ],             "modules/custom/{$name}": [                 "type:drupal-custom-module"             ],             "themes/custom/{$name}": [                 "type:drupal-custom-theme"             ]         }     },     "autoload": {         "psr-4": {             "Drupal\Core\Composer\": "core/lib/Drupal/Core/Composer"         }     },     "scripts": {         "pre-autoload-dump": "Drupal\Core\Composer\Composer::preAutoloadDump",         "post-autoload-dump": [             "Drupal\Core\Composer\Composer::ensureHtaccess"         ],         "post-package-install": "Drupal\Core\Composer\Composer::vendorTestCodeCleanup",         "post-package-update": "Drupal\Core\Composer\Composer::vendorTestCodeCleanup"     },     "repositories": {         "0": {             "type": "composer",             "url": "https://packages.drupal.org/8"         },         "drupal": {             "type": "composer",             "url": "https://packages.drupal.org/8"         }     } }
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