diff --git a/composer.lock b/composer.lock
index 50ad107..640085f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -185,12 +185,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/phoice/phlexa.git",
-                "reference": "92cc509b4976a8120d531a869b9afce3d2162bf9"
+                "reference": "71b585867732ce173f7608b40056e1ebefd092d2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phoice/phlexa/zipball/92cc509b4976a8120d531a869b9afce3d2162bf9",
-                "reference": "92cc509b4976a8120d531a869b9afce3d2162bf9",
+                "url": "https://api.github.com/repos/phoice/phlexa/zipball/71b585867732ce173f7608b40056e1ebefd092d2",
+                "reference": "71b585867732ce173f7608b40056e1ebefd092d2",
                 "shasum": ""
             },
             "require": {
@@ -1374,16 +1374,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "7.1.1",
+            "version": "7.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "f7fe5127889519e421600fe0feeb113a5e210f20"
+                "reference": "6a17c170fb92845896e1b3b00fcb462cd4b3c017"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/f7fe5127889519e421600fe0feeb113a5e210f20",
-                "reference": "f7fe5127889519e421600fe0feeb113a5e210f20",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/6a17c170fb92845896e1b3b00fcb462cd4b3c017",
+                "reference": "6a17c170fb92845896e1b3b00fcb462cd4b3c017",
                 "shasum": ""
             },
             "require": {
@@ -1450,20 +1450,20 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2018-04-06T12:39:30+00:00"
+            "time": "2018-04-10T11:40:22+00:00"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
-            "version": "6.1.0",
+            "version": "6.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit-mock-objects.git",
-                "reference": "3f5ca97eee66a07951d018f6726017629c85c86d"
+                "reference": "70c740bde8fd9ea9ea295be1cd875dd7b267e157"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit-mock-objects/zipball/3f5ca97eee66a07951d018f6726017629c85c86d",
-                "reference": "3f5ca97eee66a07951d018f6726017629c85c86d",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit-mock-objects/zipball/70c740bde8fd9ea9ea295be1cd875dd7b267e157",
+                "reference": "70c740bde8fd9ea9ea295be1cd875dd7b267e157",
                 "shasum": ""
             },
             "require": {
@@ -1506,7 +1506,7 @@
                 "mock",
                 "xunit"
             ],
-            "time": "2018-04-06T08:14:40+00:00"
+            "time": "2018-04-11T04:50:36+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
diff --git a/src/Middleware/LogAlexaRequestMiddleware.php b/src/Middleware/LogAlexaRequestMiddleware.php
index 8396582..2d9bb1c 100644
--- a/src/Middleware/LogAlexaRequestMiddleware.php
+++ b/src/Middleware/LogAlexaRequestMiddleware.php
@@ -45,7 +45,7 @@ public function process(Request $request, RequestHandlerInterface $handler): Res
             && $request->getHeaderLine('signaturecertchainurl')
         ) {
             if ($this->logFlag) {
-                $microtime = explode('.', microtime(true));
+                $microtime = explode('.', (string) microtime(true));
 
                 $random = date('Y-m-d-H-i-s-') . $microtime[1];