diff --git a/composer.lock b/composer.lock
index b055e20..096972c 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": "a4dcebfb359ae2174165b199f26c9ef2",
+    "content-hash": "61f2f934e1828cc882b4efaebc45fe21",
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             "name": "composer/ca-bundle",
@@ -2739,20 +2739,20 @@
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-            "version": "1.9.0",
+            "version": "1.9.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "78af75148f9fdd34ea727c8b529a9b4a8f7b740c"
+                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72"
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             "dist": {
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-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/78af75148f9fdd34ea727c8b529a9b4a8f7b740c",
-                "reference": "78af75148f9fdd34ea727c8b529a9b4a8f7b740c",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
+                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
                 "shasum": ""
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             "require": {
-                "php": "^7.2"
+                "php": "^7.1"
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             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -2760,8 +2760,6 @@
             "require-dev": {
                 "doctrine/collections": "^1.0",
                 "doctrine/common": "^2.6",
-                "phpstan/phpstan": "^0.9.2",
-                "phpstan/phpstan-phpunit": "^0.9.4",
                 "phpunit/phpunit": "^7.1"
             },
             "type": "library",
@@ -2785,7 +2783,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2018-10-30T00:14:44+00:00"
+            "time": "2019-04-07T13:18:21+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -3908,16 +3906,16 @@
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         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.4.1",
+            "version": "3.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "5b4333b4010625d29580eb4a41f1e53251be6baa"
+                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8"
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             "dist": {
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-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/5b4333b4010625d29580eb4a41f1e53251be6baa",
-                "reference": "5b4333b4010625d29580eb4a41f1e53251be6baa",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
+                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
                 "shasum": ""
             },
             "require": {
@@ -3955,7 +3953,7 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2019-03-19T03:22:27+00:00"
+            "time": "2019-04-10T23:49:02+00:00"
         },
         {
             "name": "webmozart/assert",