diff --git a/composer.json b/composer.json
index 588b0918..4495cdd8 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
 
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+      "phpunit/phpunit": "~8.0",
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diff --git a/composer.lock b/composer.lock
index fd103cef..bafbac5d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "e0cf2fba78c25faf3a6a5ab99a826a16",
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@@ -806,40 +806,40 @@
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+            "version": "7.0.3",
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-                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d",
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-                "php": "^7.1",
-                "phpunit/php-file-iterator": "^2.0",
+                "php": "^7.2",
+                "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^3.0",
+                "phpunit/php-token-stream": "^3.0.1",
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-                "sebastian/environment": "^3.1 || ^4.0",
+                "sebastian/environment": "^4.1",
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                 "theseer/tokenizer": "^1.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^7.0"
+                "phpunit/phpunit": "^8.0"
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+                "ext-xdebug": "^2.6.1"
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+                    "dev-master": "7.0-dev"
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@@ -865,7 +865,7 @@
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-            "time": "2018-10-31T16:06:48+00:00"
+            "time": "2019-02-26T07:38:26+00:00"
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@@ -960,16 +960,16 @@
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+            "version": "2.1.1",
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                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "8b8454ea6958c3dee38453d3bd571e023108c91f"
+                "reference": "8b389aebe1b8b0578430bda0c7c95a829608e059"
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-                "reference": "8b8454ea6958c3dee38453d3bd571e023108c91f",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/8b389aebe1b8b0578430bda0c7c95a829608e059",
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@@ -981,7 +981,7 @@
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+                    "dev-master": "2.1-dev"
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@@ -1005,7 +1005,7 @@
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-            "time": "2018-02-01T13:07:23+00:00"
+            "time": "2019-02-20T10:12:59+00:00"
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@@ -1058,16 +1058,16 @@
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-                "reference": "2896657da5fb237bc316bdfc18c2650efeee0dc0",
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@@ -1077,27 +1077,25 @@
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-                "php": "^7.1",
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                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-timer": "^2.0",
+                "phpunit/php-timer": "^2.1",
                 "sebastian/comparator": "^3.0",
                 "sebastian/diff": "^3.0",
-                "sebastian/environment": "^4.0",
+                "sebastian/environment": "^4.1",
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-                "sebastian/global-state": "^2.0",
+                "sebastian/global-state": "^3.0",
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@@ -1112,7 +1110,7 @@
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@@ -1138,7 +1136,7 @@
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-            "time": "2019-02-07T14:15:04+00:00"
+            "time": "2019-03-16T07:33:46+00:00"
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@@ -1659,23 +1657,26 @@
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-                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/edf8a461cf1d4005f19fb0b6b8b95a9f7fa0adc4",
+                "reference": "edf8a461cf1d4005f19fb0b6b8b95a9f7fa0adc4",
                 "shasum": ""
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             "require": {
-                "php": "^7.0"
+                "php": "^7.2",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "ext-dom": "*",
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@@ -1683,7 +1684,7 @@
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@@ -1706,7 +1707,7 @@
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-            "time": "2017-04-27T15:39:26+00:00"
+            "time": "2019-02-01T05:30:01+00:00"
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