diff --git a/docker-compose.yml b/docker-compose.yml
index 71991376..4951614b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,8 +3,7 @@ version: '3'
 services:
     php56:
         build:
-            context: .
-            dockerfile: ./docker/php56/Dockerfile
+            context: ./docker/php56
         working_dir: /var/www/html
         command: >
             sh -c "
@@ -17,3 +16,19 @@ services:
         volumes:
             - .:/var/www/html
             - ./docker/php56/php.ini:/usr/local/etc/php/php.ini:ro
+
+    dev_tools:
+        build:
+            context: ./docker/dev-tools
+        working_dir: /var/www/html
+        command: >
+            sh -c "
+                chown -R www-data:www-data /var/www/.composer \
+                && su-exec www-data composer bin all install -o \
+                && echo 'Logs from /var/log/php/error.log:' \
+                && touch /var/log/php/error.log \
+                && tail -f /var/log/php/error.log
+            "
+        volumes:
+            - .:/var/www/html
+            - ./docker/php56/php.ini:/usr/local/etc/php/php.ini:ro
diff --git a/docker/dev-tools/Dockerfile b/docker/dev-tools/Dockerfile
new file mode 100644
index 00000000..452aa5c3
--- /dev/null
+++ b/docker/dev-tools/Dockerfile
@@ -0,0 +1,18 @@
+FROM php:7.2-cli-alpine
+
+RUN apk add --no-cache \
+        su-exec && \
+    docker-php-ext-install -j$(nproc) \
+        opcache
+
+RUN mkdir -p \
+        /var/log/php \
+        /var/www/.composer \
+    && touch /var/log/php/error.log \
+    && chown www-data:www-data \
+        /var/log/php/error.log \
+        /var/www/.composer
+
+COPY --from=composer:1.8 /usr/bin/composer /usr/bin/composer
+ENV COMPOSER_HOME /var/www/.composer
+RUN su-exec www-data composer global require hirak/prestissimo -a && rm -rf /var/www/.composer/cache
diff --git a/docker/php56/Dockerfile b/docker/php56/Dockerfile
index 5bc926d6..4fc7c54a 100644
--- a/docker/php56/Dockerfile
+++ b/docker/php56/Dockerfile
@@ -3,7 +3,8 @@ FROM php:5.6-cli-alpine
 RUN apk add --no-cache \
         su-exec && \
     docker-php-ext-install -j$(nproc) \
-        opcache
+        opcache \
+        sysvsem
 
 RUN mkdir -p \
         /var/log/php \
diff --git a/src/Event.php b/src/Event.php
index a701b77c..cd01819d 100644
--- a/src/Event.php
+++ b/src/Event.php
@@ -12,8 +12,10 @@
 use Crunz\Pinger\PingableInterface;
 use Crunz\Pinger\PingableTrait;
 use SuperClosure\Serializer;
+use Symfony\Component\Lock\Exception\InvalidArgumentException;
 use Symfony\Component\Lock\Factory;
 use Symfony\Component\Lock\Lock;
+use Symfony\Component\Lock\Store\FlockStore;
 use Symfony\Component\Lock\StoreInterface;
 use Symfony\Component\Process\Process;
 
@@ -27,13 +29,6 @@ class Event implements PingableInterface
 {
     use PingableTrait;
 
-    /**
-     * Indicates if the command should not overlap itself.
-     *
-     * @var bool
-     */
-    public $preventOverlapping = false;
-
     /**
      * The location that output should be sent to.
      *
@@ -158,6 +153,13 @@ class Event implements PingableInterface
         'month' => 4,
         'week' => 5,
     ];
+
+    /**
+     * Indicates if the command should not overlap itself.
+     *
+     * @var bool
+     */
+    private $preventOverlapping = false;
     /** @var ClockInterface */
     private static $clock;
 
@@ -168,15 +170,10 @@ class Event implements PingableInterface
      * @var Factory|null
      */
     private $lockFactory;
-
-    /**
-     * Contains the timestamp of the last lock refresh.
-     *
-     * @var int
-     */
-    private $lastLockRefresh = 0;
-
+    /** @var string[] */
     private $wholeOutput = [];
+    /** @var Lock */
+    private $lock;
 
     /**
      * Create a new event instance.
@@ -754,14 +751,16 @@ public function user($user)
      */
     public function preventOverlapping(StoreInterface $store = null)
     {
+        $lockStore = $store ?: $this->createDefaultLockStore();
         $this->preventOverlapping = true;
-        if (null !== $store) {
-            $this->lockFactory = new Factory($store);
-        }
+        $this->lockFactory = new Factory($lockStore);
 
         // Skip the event if it's locked (processing)
         $this->skip(function () {
-            return $this->isLocked();
+            $lock = $this->createLockObject();
+            $lock->acquire();
+
+            return !$lock->isAcquired();
         });
 
         // Delete the lock file when the event is completed
@@ -1047,57 +1046,6 @@ public function afterCallbacks()
         return $this->afterCallbacks;
     }
 
-    /**
-     * Check if another instance of the event is still running.
-     *
-     * @return bool
-     */
-    public function isLocked()
-    {
-        if (null !== $this->lockFactory) {
-            $lock = $this->createLockObject();
-
-            return $lock->isAcquired();
-        }
-
-        // If no symfony lock object is given, fall back to file system locks.
-        $pid = $this->lastPid();
-        $hasPid = (null !== $pid);
-
-        // No POSIX on Windows
-        if ($this->isWindows()) {
-            return $hasPid;
-        }
-
-        return ($hasPid && posix_getsid($pid)) ? true : false;
-    }
-
-    /**
-     * Get the last process Id of the event.
-     *
-     * @return int
-     */
-    public function lastPid()
-    {
-        $lock_file = $this->lockFile();
-
-        return file_exists($lock_file) ? (int) trim(file_get_contents($lock_file)) : null;
-    }
-
-    /**
-     * Get the lock file path for the task.
-     *
-     * @return string
-     */
-    public function lockFile()
-    {
-        if (null !== $this->lockFactory) {
-            throw new \BadMethodCallException('We are not using file based locking, but instead symfony/lock');
-        }
-
-        return rtrim(sys_get_temp_dir(), '/') . '/crunz-' . md5($this->buildCommand());
-    }
-
     /**
      * If this event is prevented from overlapping, this method should be called regularly to refresh the lock.
      */
@@ -1107,14 +1055,18 @@ public function refreshLock()
             return;
         }
 
-        if (null === $this->lockFactory) {
-            // In case of file based locking there is nothing to do.
+        $lock = $this->createLockObject();
+        $remainingLifetime = $lock->getRemainingLifetime();
+
+        // Lock will never expire
+        if (null === $remainingLifetime) {
+            return;
         }
 
-        // Refresh lock every 10s
-        $lockRefreshNeeded = $this->lastLockRefresh < (time() - 10);
+        // Refresh 15s before lock expiration
+        $lockRefreshNeeded = $remainingLifetime < 15;
         if ($lockRefreshNeeded) {
-            $this->createLockObject()->refresh();
+            $lock->refresh();
         }
     }
 
@@ -1125,15 +1077,16 @@ public function refreshLock()
      */
     protected function createLockObject()
     {
-        if (null === $this->lockFactory) {
-            throw new \BadMethodCallException(
-                'No lock factory. Please call preventOverlapping() with lock storage first.'
-            );
-        }
+        $this->checkLockFactory();
+
+        if (null === $this->lock) {
+            $ttl = 30;
 
-        $ttl = 30;
+            $this->lock = $this->lockFactory
+                ->createLock($this->lockKey(), $ttl);
+        }
 
-        return $this->lockFactory->createLock('crunz-' . md5($this->buildCommand()), $ttl);
+        return $this->lock;
     }
 
     /**
@@ -1141,17 +1094,10 @@ protected function createLockObject()
      */
     protected function releaseLock()
     {
-        if (null !== $this->lockFactory) {
-            $lock = $this->createLockObject();
-            $lock->release();
+        $this->checkLockFactory();
 
-            return;
-        }
-
-        $lockfile = $this->lockFile();
-        if (file_exists($lockfile)) {
-            unlink($lockfile);
-        }
+        $lock = $this->createLockObject();
+        $lock->release();
     }
 
     /**
@@ -1271,14 +1217,53 @@ protected function applyMask($unit)
 
     /**
      * Lock the event.
+     */
+    protected function lock()
+    {
+        $lock = $this->createLockObject();
+        $lock->acquire();
+    }
+
+    /**
+     * @return FlockStore
      *
-     * @param \Crunz\Event $event
-     *
+     * @throws Exception\CrunzException
+     */
+    private function createDefaultLockStore()
+    {
+        try {
+            $lockPath = Path::create(
+                [
+                    \sys_get_temp_dir(),
+                    '.crunz',
+                ]
+            );
+
+            $store = new FlockStore($lockPath->toString());
+        } catch (InvalidArgumentException $exception) {
+            // Fallback to system temp dir
+            $lockPath = Path::create([\sys_get_temp_dir()]);
+            $store = new FlockStore($lockPath->toString());
+        }
+
+        return $store;
+    }
+
+    /**
      * @return string
      */
-    protected function lock()
+    private function lockKey()
     {
-        file_put_contents($this->lockFile(), $this->process->getPid());
+        return 'crunz-' . \md5($this->buildCommand());
+    }
+
+    private function checkLockFactory()
+    {
+        if (null === $this->lockFactory) {
+            throw new \BadMethodCallException(
+                'No lock factory. Please call preventOverlapping() first.'
+            );
+        }
     }
 
     /** @return ClockInterface */
diff --git a/src/EventRunner.php b/src/EventRunner.php
index 35dc7743..107e8ce2 100644
--- a/src/EventRunner.php
+++ b/src/EventRunner.php
@@ -147,10 +147,14 @@ protected function manageStartedEvents()
         while ($this->schedules) {
             foreach ($this->schedules as $scheduleKey => $schedule) {
                 $events = $schedule->events();
+                // 10% chance that refresh will be called
+                $refreshLocks = (\rand(1, 100) <= 10);
 
                 /** @var Event $event */
                 foreach ($events as $eventKey => $event) {
-                    $event->refreshLock();
+                    if ($refreshLocks) {
+                        $event->refreshLock();
+                    }
 
                     $proc = $event->getProcess();
                     if ($proc->isRunning()) {
diff --git a/tests/Unit/EventTest.php b/tests/Unit/EventTest.php
index c7df1eaa..b6802a66 100644
--- a/tests/Unit/EventTest.php
+++ b/tests/Unit/EventTest.php
@@ -7,6 +7,8 @@
 use Crunz\Tests\TestCase\TestClock;
 use PHPUnit\Framework\TestCase;
 use SuperClosure\Serializer;
+use Symfony\Component\Lock\Store\SemaphoreStore;
+use Symfony\Component\Lock\StoreInterface;
 
 class EventTest extends TestCase
 {
@@ -371,6 +373,43 @@ public function wholeOutputCatchesStdoutAndStderr()
         );
     }
 
+    /** @test */
+    public function taskWillPreventOverlappingWithDefaultStore()
+    {
+        $this->assertPreventOverlapping();
+    }
+
+    /** @test */
+    public function taskWillPreventOverlappingWithSemaphoreStore()
+    {
+        if (!\extension_loaded('sysvsem')) {
+            $this->markTestSkipped('Semaphore extension not installed.');
+        }
+
+        $this->assertPreventOverlapping(new SemaphoreStore());
+    }
+
+    private function assertPreventOverlapping(StoreInterface $store = null)
+    {
+        $event = $this->createPreventOverlappingEvent($store);
+        $event2 = $this->createPreventOverlappingEvent($store);
+
+        $event->start();
+
+        $this->assertFalse($event2->isDue(new \DateTimeZone('UTC')));
+    }
+
+    private function createPreventOverlappingEvent(StoreInterface $store = null)
+    {
+        $command = "php -r 'sleep(2);'";
+
+        $event = new Event(\uniqid('c', true), $command);
+        $event->preventOverlapping($store);
+        $event->everyMinute();
+
+        return $event;
+    }
+
     private function setClockNow(\DateTimeImmutable $dateTime)
     {
         $testClock = new TestClock($dateTime);
diff --git a/tests/Unit/PreventOverlappingTest.php b/tests/Unit/PreventOverlappingTest.php
deleted file mode 100644
index 6e90b7b3..00000000
--- a/tests/Unit/PreventOverlappingTest.php
+++ /dev/null
@@ -1,143 +0,0 @@
-<?php
-
-namespace Crunz\Tests\Unit;
-
-use Crunz\Configuration\Configuration;
-use Crunz\Event;
-use Crunz\EventRunner;
-use Crunz\HttpClient\HttpClientInterface;
-use Crunz\Invoker;
-use Crunz\Logger\ConsoleLoggerInterface;
-use Crunz\Logger\LoggerFactory;
-use Crunz\Mailer;
-use Crunz\Schedule;
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Output\NullOutput;
-use Symfony\Component\Lock\Store\FlockStore;
-use Symfony\Component\Lock\Store\SemaphoreStore;
-use Symfony\Component\Lock\StoreInterface;
-
-final class PreventOverlappingTest extends TestCase
-{
-    /**
-     * @dataProvider lockDataProvider
-     * @test
-     *
-     * @param StoreInterface|null $store
-     */
-    public function testPreventOverlapping(StoreInterface $store = null)
-    {
-        $command = PHP_BINARY . ' -r "usleep(250000);"';
-
-        $schedule1 = new Schedule();
-        $event1 = $schedule1->run($command)
-            ->description('Show PHP version')
-            ->preventOverlapping()
-            ->everyMinute();
-
-        // Exact same event, might come from another schedule:run
-        $schedule2 = new Schedule();
-        $event2 = $schedule2->run($command)
-            ->description('Show PHP version')
-            ->preventOverlapping()
-            ->everyMinute();
-
-        $eventRunner = new MyEventRunner(
-            new Invoker(),
-            $this->createMock(Configuration::class),
-            $this->createMock(Mailer::class),
-            $this->createMock(LoggerFactory::class),
-            $this->createMock(HttpClientInterface::class),
-            $this->createMock(ConsoleLoggerInterface::class)
-        );
-
-        // Both events are due, none is locked yet
-        $this->assertEquals([$event1], $schedule1->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-        $this->assertEquals([$event2], $schedule2->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-
-        // Start schedule1, so that event1 will be locked
-        $eventRunner->handle(new NullOutput(), [$schedule1]);
-
-        // Event is locked and therefore not due (even over the boundaries of multiple independent events and schedules)
-        $this->assertEquals([], $schedule1->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-        $this->assertEquals([], $schedule2->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-
-        // Assert only one process is running
-        $this->assertTrue($event1->getProcess()->isRunning());
-        $this->assertNull($event2->getProcess(), 'Event 2 should not be running');
-
-        // Assert lock on both events
-        $this->assertTrue($event1->isLocked());
-        $this->assertTrue($event2->isLocked());
-
-        // Wait until the process finished
-        $start = time();
-        while ($event1->isLocked()) {
-            // Verify the events are still locked while the process is running
-            $this->assertEquals([], $schedule1->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-            $this->assertEquals([], $schedule2->dueEvents(new \DateTimeZone(date_default_timezone_get())));
-            $this->assertTrue($event1->isLocked());
-            $this->assertTrue($event2->isLocked());
-
-            $eventRunner->manageStartedEvents();
-            usleep(50000);
-
-            if (time() - $start > 5) {
-                $this->fail('Lock was not released after 5 seconds, something is wrong here.');
-            }
-        }
-
-        // Assert both locks were removed
-        $this->assertFalse($event1->isLocked());
-        $this->assertFalse($event2->isLocked());
-    }
-
-    public function lockDataProvider()
-    {
-        // File based lock storage in sys_get_temp_dir()
-        yield [null];
-
-        // Symfony lock with file based lock store
-        yield [new FlockStore()];
-
-        if (extension_loaded('sysvsem')) {
-            // Symfony lock with semaphore store
-            yield [new SemaphoreStore()];
-        }
-    }
-}
-
-class MyEventRunner extends EventRunner
-{
-    /**
-     * Manage the running processes.
-     *
-     * This is a simplified version that checks whether the processes are still running and returns afterwards.
-     *
-     * This adoption is non-blocking / does not wait for all processes to finish, because otherwise we could not test
-     * the locking in a single threaded manner.
-     */
-    public function manageStartedEvents()
-    {
-        foreach ($this->schedules as $scheduleKey => $schedule) {
-            $events = $schedule->events();
-
-            /** @var Event $event */
-            foreach ($events as $eventKey => $event) {
-                $proc = $event->getProcess();
-                if ($proc->isRunning()) {
-                    continue;
-                }
-
-                // Dismiss the event after it's finished
-                $this->invoke($event->afterCallbacks());
-                $schedule->dismissEvent($eventKey);
-            }
-
-            if (!\count($schedule->events())) {
-                $this->invoke($schedule->afterCallbacks());
-                unset($this->schedules[$scheduleKey]);
-            }
-        }
-    }
-}
diff --git a/vendor-bin/changelog-linker/composer.lock b/vendor-bin/changelog-linker/composer.lock
index 5fd87d63..a5481161 100644
--- a/vendor-bin/changelog-linker/composer.lock
+++ b/vendor-bin/changelog-linker/composer.lock
@@ -124,32 +124,33 @@
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.4.2",
+            "version": "1.5.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
+                "reference": "9f83dded91781a01c63574e387eaa769be769115"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/9f83dded91781a01c63574e387eaa769be769115",
+                "reference": "9f83dded91781a01c63574e387eaa769be769115",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0",
-                "psr/http-message": "~1.0"
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5"
             },
             "provide": {
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev"
+                    "dev-master": "1.5-dev"
                 }
             },
             "autoload": {
@@ -179,13 +180,14 @@
             "keywords": [
                 "http",
                 "message",
+                "psr-7",
                 "request",
                 "response",
                 "stream",
                 "uri",
                 "url"
             ],
-            "time": "2017-03-20T17:10:46+00:00"
+            "time": "2018-12-04T20:46:45+00:00"
         },
         {
             "name": "nette/finder",
@@ -432,16 +434,16 @@
         },
         {
             "name": "psr/log",
-            "version": "1.0.2",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/log.git",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
+                "reference": "6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd",
+                "reference": "6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd",
                 "shasum": ""
             },
             "require": {
@@ -475,20 +477,60 @@
                 "psr",
                 "psr-3"
             ],
-            "time": "2016-10-10T12:19:37+00:00"
+            "time": "2018-11-20T15:27:04+00:00"
+        },
+        {
+            "name": "ralouphie/getallheaders",
+            "version": "2.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~3.7.0",
+                "satooshi/php-coveralls": ">=1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "time": "2016-02-11T07:05:27+00:00"
         },
         {
             "name": "symfony/config",
-            "version": "v4.1.7",
+            "version": "v4.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
-                "reference": "991fec8bbe77367fc8b48ecbaa8a4bd6e905a238"
+                "reference": "005d9a083d03f588677d15391a716b1ac9b887c0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/config/zipball/991fec8bbe77367fc8b48ecbaa8a4bd6e905a238",
-                "reference": "991fec8bbe77367fc8b48ecbaa8a4bd6e905a238",
+                "url": "https://api.github.com/repos/symfony/config/zipball/005d9a083d03f588677d15391a716b1ac9b887c0",
+                "reference": "005d9a083d03f588677d15391a716b1ac9b887c0",
                 "shasum": ""
             },
             "require": {
@@ -511,7 +553,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.1-dev"
+                    "dev-master": "4.2-dev"
                 }
             },
             "autoload": {
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diff --git a/vendor-bin/cs-fixer/composer.lock b/vendor-bin/cs-fixer/composer.lock
index 5409cc32..058aec12 100644
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@@ -70,16 +70,16 @@
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