diff --git a/composer.json b/composer.json
index 578808d..12251d7 100644
--- a/composer.json
+++ b/composer.json
@@ -56,6 +56,9 @@
         ]
     },
     "config": {
+        "platform": {
+            "php": "7.1.23"
+        },
         "preferred-install": {
             "*": "dist"
         },
diff --git a/composer.lock b/composer.lock
index e99a25f..8afaff8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "fdd4f42890e074443a6a40e031864ff0",
+    "content-hash": "d0b05454f85f820522811cd3cdb03cb8",
     "packages": [
         {
             "name": "doctrine/annotations",
@@ -1342,34 +1342,33 @@
         },
         {
             "name": "ocramius/proxy-manager",
-            "version": "2.2.2",
+            "version": "2.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Ocramius/ProxyManager.git",
-                "reference": "14b137b06b0f911944132df9d51e445a35920ab1"
+                "reference": "e18ac876b2e4819c76349de8f78ccc8ef1554cd7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Ocramius/ProxyManager/zipball/14b137b06b0f911944132df9d51e445a35920ab1",
-                "reference": "14b137b06b0f911944132df9d51e445a35920ab1",
+                "url": "https://api.github.com/repos/Ocramius/ProxyManager/zipball/e18ac876b2e4819c76349de8f78ccc8ef1554cd7",
+                "reference": "e18ac876b2e4819c76349de8f78ccc8ef1554cd7",
                 "shasum": ""
             },
             "require": {
-                "ocramius/package-versions": "^1.1.3",
-                "php": "^7.2.0",
-                "zendframework/zend-code": "^3.3.0"
+                "ocramius/package-versions": "^1.1.1",
+                "php": "^7.1.0",
+                "zendframework/zend-code": "^3.1.0"
             },
             "require-dev": {
-                "couscous/couscous": "^1.6.1",
+                "couscous/couscous": "^1.5.2",
                 "ext-phar": "*",
-                "humbug/humbug": "1.0.0-RC.0@RC",
-                "nikic/php-parser": "^3.1.1",
-                "padraic/phpunit-accelerator": "dev-master@DEV",
+                "humbug/humbug": "dev-master@DEV",
+                "nikic/php-parser": "^3.0.4",
                 "phpbench/phpbench": "^0.12.2",
-                "phpstan/phpstan": "dev-master#856eb10a81c1d27c701a83f167dc870fd8f4236a as 0.9.999",
-                "phpstan/phpstan-phpunit": "dev-master#5629c0a1f4a9c417cb1077cf6693ad9753895761",
-                "phpunit/phpunit": "^6.4.3",
-                "squizlabs/php_codesniffer": "^2.9.1"
+                "phpstan/phpstan": "^0.6.4",
+                "phpunit/phpunit": "^5.6.4",
+                "phpunit/phpunit-mock-objects": "^3.4.1",
+                "squizlabs/php_codesniffer": "^2.7.0"
             },
             "suggest": {
                 "ocramius/generated-hydrator": "To have very fast object to array to object conversion for ghost objects",
@@ -1408,7 +1407,7 @@
                 "proxy pattern",
                 "service proxies"
             ],
-            "time": "2018-09-27T13:45:01+00:00"
+            "time": "2017-05-04T11:12:50+00:00"
         },
         {
             "name": "psr/cache",
@@ -5567,5 +5566,8 @@
     "platform": {
         "php": ">=7.1.0"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "7.1.23"
+    }
 }