diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b9e130..568c064 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 All notable changes to `spatie/crawler` will be documented in this file.
 
-## 4.0.0 - 2018-XX-XX
+## 4.0.1 - 2018-03-01
+
+- fix bugs when installed in Laravel projects
+
+## 4.0.0 - 2018-03-01
 
 - the `CrawlObserver` and `CrawlProfile` are upgraded from interfaces to abstract classes
 - don't crawl `tel:` links
diff --git a/src/CrawlQueue/CollectionCrawlQueue.php b/src/CrawlQueue/CollectionCrawlQueue.php
index 823f8b3..75d2930 100644
--- a/src/CrawlQueue/CollectionCrawlQueue.php
+++ b/src/CrawlQueue/CollectionCrawlQueue.php
@@ -16,9 +16,9 @@ class CollectionCrawlQueue implements CrawlQueue
 
     public function __construct()
     {
-        $this->urls = collect();
+        $this->urls = new Collection();
 
-        $this->pendingUrls = collect();
+        $this->pendingUrls = new Collection();
     }
 
     public function add(CrawlUrl $url): CrawlQueue
diff --git a/src/Crawler.php b/src/Crawler.php
index 50f2c19..b468f77 100644
--- a/src/Crawler.php
+++ b/src/Crawler.php
@@ -357,7 +357,7 @@ protected function addAllLinksToCrawlQueue(string $html, UriInterface $foundOnUr
     {
         $allLinks = $this->extractAllLinks($html, $foundOnUrl);
 
-        collect($allLinks)
+        (new Collection($allLinks))
             ->filter(function (UriInterface $url) {
                 return $this->hasCrawlableScheme($url);
             })
@@ -408,7 +408,7 @@ protected function extractAllLinks(string $html, UriInterface $foundOnUrl): Coll
 
         $domCrawler = new DomCrawler($html, $foundOnUrl);
 
-        return collect($domCrawler->filterXpath('//a')->links())
+        return (new Collection($domCrawler->filterXpath('//a')->links()))
             ->map(function (Link $link) {
                 try {
                     return new Uri($link->getUri());