diff --git a/.travis.yml b/.travis.yml
index cdc77ec6..b0e7f8f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,9 @@ env:
 
 php:
     - 5.6
+    - 7.0
+    - 7.1
+    - 7.2
 
 before_script:
     - composer self-update
diff --git a/src/PHPCR/Shell/Test/CliContext.php b/src/PHPCR/Shell/Test/CliContext.php
index ddb8bd0b..5c0b1923 100644
--- a/src/PHPCR/Shell/Test/CliContext.php
+++ b/src/PHPCR/Shell/Test/CliContext.php
@@ -39,7 +39,7 @@ public function beforeScenario()
 
         $this->rootPath = realpath(__DIR__.'/../../../..');
         $dir = sys_get_temp_dir().DIRECTORY_SEPARATOR.'phpcr-shell'.DIRECTORY_SEPARATOR.
-            md5(microtime() * rand(0, 10000));
+            md5(microtime(true) * rand(0, 10000));
         $this->fixturesDir = realpath(__DIR__.'/../../../../features/fixtures/');
 
         $this->workingDir = $dir;
diff --git a/src/PHPCR/Shell/Test/ContextBase.php b/src/PHPCR/Shell/Test/ContextBase.php
index dc172f28..8385fe86 100644
--- a/src/PHPCR/Shell/Test/ContextBase.php
+++ b/src/PHPCR/Shell/Test/ContextBase.php
@@ -50,7 +50,7 @@ abstract protected function createTester();
     public function beforeScenario()
     {
         $dir = sys_get_temp_dir().DIRECTORY_SEPARATOR.'phpcr-shell'.DIRECTORY_SEPARATOR.
-            md5(microtime() * rand(0, 10000));
+            md5(microtime(true) * rand(0, 10000));
 
         $this->workingDir = $dir;