diff --git a/composer.json b/composer.json
index 24b55957..4af9cfe0 100644
--- a/composer.json
+++ b/composer.json
@@ -23,8 +23,7 @@
     "phpro/grumphp": "^0.11.6",
     "jakub-onderka/php-parallel-lint": "^0.9.2",
     "sebastian/phpcpd": "^3.0",
-    "squizlabs/php_codesniffer": "^3.0",
-    "sensiolabs/security-checker": "^4.1"
+    "squizlabs/php_codesniffer": "^3.0"
   },
   "autoload": {
     "psr-4": {"cweagans\\Composer\\": "src"}
diff --git a/composer.lock b/composer.lock
index 4eacb379..ed2df3cb 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "2906b39d0df72b75372bcc241ee77748",
+    "content-hash": "2d57154741f782ce5c35458321c7b3a2",
     "packages": [],
     "packages-dev": [
         {
@@ -3065,51 +3065,6 @@
             ],
             "time": "2015-10-13T18:44:15+00:00"
         },
-        {
-            "name": "sensiolabs/security-checker",
-            "version": "v4.1.5",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sensiolabs/security-checker.git",
-                "reference": "55553c3ad6ae2121c1b1475d4c880d71b31b8f68"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sensiolabs/security-checker/zipball/55553c3ad6ae2121c1b1475d4c880d71b31b8f68",
-                "reference": "55553c3ad6ae2121c1b1475d4c880d71b31b8f68",
-                "shasum": ""
-            },
-            "require": {
-                "composer/ca-bundle": "^1.0",
-                "symfony/console": "~2.7|~3.0"
-            },
-            "bin": [
-                "security-checker"
-            ],
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.1-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "SensioLabs\\Security": ""
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien.potencier@gmail.com"
-                }
-            ],
-            "description": "A security checker for your composer.lock",
-            "time": "2017-08-22T22:18:16+00:00"
-        },
         {
             "name": "squizlabs/php_codesniffer",
             "version": "3.1.1",
diff --git a/composerjson_changes.patch b/composerjson_changes.patch
new file mode 100644
index 00000000..7ff407c5
--- /dev/null
+++ b/composerjson_changes.patch
@@ -0,0 +1,17 @@
+diff --git a/composer.json b/composer.json
+index 24b5595..0e8050b 100644
+--- a/composer.json
++++ b/composer.json
+@@ -24,7 +24,11 @@
+     "jakub-onderka/php-parallel-lint": "^0.9.2",
+     "sebastian/phpcpd": "^3.0",
+     "squizlabs/php_codesniffer": "^3.0",
+-    "sensiolabs/security-checker": "^4.1"
++    "sensiolabs/security-checker": "^4.1",
++      "doctrine/collections": "1.4.0",
++      "doctrine/instantiator": "1.0.5",
++      "ocramius/proxy-manager": "2.0.4",
++      "phpspec/prophecy": "1.6.2"
+   },
+   "autoload": {
+     "psr-4": {"cweagans\\Composer\\": "src"}
diff --git a/grumphp.yml b/grumphp.yml
index 49637a48..f2280b9f 100644
--- a/grumphp.yml
+++ b/grumphp.yml
@@ -6,7 +6,6 @@ parameters:
         yamllint: ~
         composer: ~
         phpcpd: ~
-        securitychecker: ~
         phpcpd:
             directory: './src'
         jsonlint: