diff --git a/composer.json b/composer.json
index e626e7c8f..95430909d 100644
--- a/composer.json
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diff --git a/composer.lock b/composer.lock
index 659991d6a..2bfcd5d62 100644
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-                "symfony/event-dispatcher": "~2.7|^3",
-                "symfony/finder": "~2.7|^3",
-                "symfony/process": "~2.7|^3",
-                "symfony/var-dumper": "~2.7|^3|^4",
-                "symfony/yaml": "~2.3|^3",
-                "webflo/drupal-finder": "^1.1",
-                "webmozart/path-util": "^2.1.0"
-            },
-            "require-dev": {
-                "composer/installers": "^1.2",
-                "cweagans/composer-patches": "~1.0",
-                "drupal/alinks": "1.0.0",
-                "drupal/devel": "^1.0@RC",
-                "drupal/empty_theme": "1.0",
-                "g1a/composer-test-scenarios": "^2.2.0",
-                "lox/xhprof": "dev-master",
-                "phpunit/phpunit": "^4.8.36|^5.5.4",
-                "squizlabs/php_codesniffer": "^2.7",
-                "webflo/drupal-core-strict": "8.6.x-dev"
-            },
-            "bin": [
-                "drush"
-            ],
-            "type": "library",
-            "extra": {
-                "installer-paths": {
-                    "sut/core": [
-                        "type:drupal-core"
-                    ],
-                    "sut/libraries/{$name}": [
-                        "type:drupal-library"
-                    ],
-                    "sut/modules/unish/{$name}": [
-                        "drupal/devel"
-                    ],
-                    "sut/themes/unish/{$name}": [
-                        "drupal/empty_theme"
-                    ],
-                    "sut/modules/contrib/{$name}": [
-                        "type:drupal-module"
-                    ],
-                    "sut/profiles/contrib/{$name}": [
-                        "type:drupal-profile"
-                    ],
-                    "sut/themes/contrib/{$name}": [
-                        "type:drupal-theme"
-                    ],
-                    "sut/drush/contrib/{$name}": [
-                        "type:drupal-drush"
-                    ]
-                },
-                "patches": {
-                    "drupal/core": {
-                        "Allow updating modules with new service dependencies https://www.drupal.org/project/drupal/issues/2863986": "https://www.drupal.org/files/issues/2863986-2-49.patch"
-                    }
-                },
-                "branch-alias": {
-                    "dev-master": "9.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Drush\\": "src/",
-                    "Drush\\Internal\\": "internal-copy/",
-                    "Unish\\": "tests/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "GPL-2.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Moshe Weitzman",
-                    "email": "weitzman@tejasa.com"
-                },
-                {
-                    "name": "Owen Barton",
-                    "email": "drupal@owenbarton.com"
-                },
-                {
-                    "name": "Greg Anderson",
-                    "email": "greg.1.anderson@greenknowe.org"
-                },
-                {
-                    "name": "Jonathan Araña Cruz",
-                    "email": "jonhattan@faita.net"
-                },
-                {
-                    "name": "Jonathan Hedstrom",
-                    "email": "jhedstrom@gmail.com"
-                },
-                {
-                    "name": "Christopher Gervais",
-                    "email": "chris@ergonlogic.com"
-                },
-                {
-                    "name": "Dave Reid",
-                    "email": "dave@davereid.net"
-                },
-                {
-                    "name": "Damian Lee",
-                    "email": "damiankloip@googlemail.com"
-                }
-            ],
-            "description": "Drush is a command line shell and scripting interface for Drupal, a veritable Swiss Army knife designed to make life easier for those of us who spend some of our working hours hacking away at the command prompt.",
-            "homepage": "http://www.drush.org",
-            "time": "2018-09-20T17:39:04+00:00"
-        },
         {
             "name": "easyrdf/easyrdf",
             "version": "0.9.1",
@@ -2445,134 +1834,6 @@
             ],
             "time": "2017-02-03T22:48:59+00:00"
         },
-        {
-            "name": "g1a/composer-test-scenarios",
-            "version": "2.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/g1a/composer-test-scenarios.git",
-                "reference": "a166fd15191aceab89f30c097e694b7cf3db4880"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/g1a/composer-test-scenarios/zipball/a166fd15191aceab89f30c097e694b7cf3db4880",
-                "reference": "a166fd15191aceab89f30c097e694b7cf3db4880",
-                "shasum": ""
-            },
-            "bin": [
-                "scripts/create-scenario",
-                "scripts/dependency-licenses",
-                "scripts/install-scenario"
-            ],
-            "type": "library",
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Greg Anderson",
-                    "email": "greg.1.anderson@greenknowe.org"
-                }
-            ],
-            "description": "Useful scripts for testing multiple sets of Composer dependencies.",
-            "time": "2018-08-08T23:37:23+00:00"
-        },
-        {
-            "name": "grasmash/expander",
-            "version": "1.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/grasmash/expander.git",
-                "reference": "95d6037344a4be1dd5f8e0b0b2571a28c397578f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/grasmash/expander/zipball/95d6037344a4be1dd5f8e0b0b2571a28c397578f",
-                "reference": "95d6037344a4be1dd5f8e0b0b2571a28c397578f",
-                "shasum": ""
-            },
-            "require": {
-                "dflydev/dot-access-data": "^1.1.0",
-                "php": ">=5.4"
-            },
-            "require-dev": {
-                "greg-1-anderson/composer-test-scenarios": "^1",
-                "phpunit/phpunit": "^4|^5.5.4",
-                "satooshi/php-coveralls": "^1.0.2|dev-master",
-                "squizlabs/php_codesniffer": "^2.7"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Grasmash\\Expander\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Matthew Grasmick"
-                }
-            ],
-            "description": "Expands internal property references in PHP arrays file.",
-            "time": "2017-12-21T22:14:55+00:00"
-        },
-        {
-            "name": "grasmash/yaml-expander",
-            "version": "1.4.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/grasmash/yaml-expander.git",
-                "reference": "3f0f6001ae707a24f4d9733958d77d92bf9693b1"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/grasmash/yaml-expander/zipball/3f0f6001ae707a24f4d9733958d77d92bf9693b1",
-                "reference": "3f0f6001ae707a24f4d9733958d77d92bf9693b1",
-                "shasum": ""
-            },
-            "require": {
-                "dflydev/dot-access-data": "^1.1.0",
-                "php": ">=5.4",
-                "symfony/yaml": "^2.8.11|^3|^4"
-            },
-            "require-dev": {
-                "greg-1-anderson/composer-test-scenarios": "^1",
-                "phpunit/phpunit": "^4.8|^5.5.4",
-                "satooshi/php-coveralls": "^1.0.2|dev-master",
-                "squizlabs/php_codesniffer": "^2.7"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Grasmash\\YamlExpander\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Matthew Grasmick"
-                }
-            ],
-            "description": "Expands internal property references in a yaml file.",
-            "time": "2017-12-16T16:06:03+00:00"
-        },
         {
             "name": "guzzlehttp/guzzle",
             "version": "6.3.3",
@@ -2841,71 +2102,6 @@
             ],
             "time": "2015-04-20T18:58:01+00:00"
         },
-        {
-            "name": "league/container",
-            "version": "2.4.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/thephpleague/container.git",
-                "reference": "43f35abd03a12977a60ffd7095efd6a7808488c0"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/container/zipball/43f35abd03a12977a60ffd7095efd6a7808488c0",
-                "reference": "43f35abd03a12977a60ffd7095efd6a7808488c0",
-                "shasum": ""
-            },
-            "require": {
-                "container-interop/container-interop": "^1.2",
-                "php": "^5.4.0 || ^7.0"
-            },
-            "provide": {
-                "container-interop/container-interop-implementation": "^1.2",
-                "psr/container-implementation": "^1.0"
-            },
-            "replace": {
-                "orno/di": "~2.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "4.*"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-2.x": "2.x-dev",
-                    "dev-1.x": "1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "League\\Container\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Phil Bennett",
-                    "email": "philipobenito@gmail.com",
-                    "homepage": "http://www.philipobenito.com",
-                    "role": "Developer"
-                }
-            ],
-            "description": "A fast and intuitive dependency injection container.",
-            "homepage": "https://github.com/thephpleague/container",
-            "keywords": [
-                "container",
-                "dependency",
-                "di",
-                "injection",
-                "league",
-                "provider",
-                "service"
-            ],
-            "time": "2017-05-10T09:20:27+00:00"
-        },
         {
             "name": "masterminds/html5",
             "version": "2.3.0",
@@ -5918,6 +5114,37 @@
             ],
             "time": "2017-04-04T11:38:05+00:00"
         },
+        {
+            "name": "container-interop/container-interop",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/container-interop/container-interop.git",
+                "reference": "79cbf1341c22ec75643d841642dd5d6acd83bdb8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/container-interop/container-interop/zipball/79cbf1341c22ec75643d841642dd5d6acd83bdb8",
+                "reference": "79cbf1341c22ec75643d841642dd5d6acd83bdb8",
+                "shasum": ""
+            },
+            "require": {
+                "psr/container": "^1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Interop\\Container\\": "src/Interop/Container/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Promoting the interoperability of container objects (DIC, SL, etc.)",
+            "homepage": "https://github.com/container-interop/container-interop",
+            "time": "2017-02-14T19:40:03+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.0.5",
@@ -7338,18 +6565,10 @@
             "time": "2018-07-26T09:06:28+00:00"
         }
     ],
-    "aliases": [
-        {
-            "alias": "9.5.0",
-            "alias_normalized": "9.5.0.0",
-            "version": "9999999-dev",
-            "package": "drush/drush"
-        }
-    ],
+    "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
-        "drupal/simple_block": 10,
-        "drush/drush": 20
+        "drupal/simple_block": 10
     },
     "prefer-stable": true,
     "prefer-lowest": false,
diff --git a/pantheon.yml b/pantheon.yml
index 48dda62c4..7c40ed502 100644
--- a/pantheon.yml
+++ b/pantheon.yml
@@ -1,6 +1,7 @@
 api_version: 1
 web_docroot: true
 php_version: 7.2
+drush_version: 9
 workflows:
   deploy_product:
     after: