diff --git a/.travis.yml b/.travis.yml
index 84851bb..34aa704 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ php:
     - "7.4"
     - "7.3"
     - "7.2"
+    - "8.0"
 
 install:
     - "mkdir -p build/logs"
diff --git a/composer.json b/composer.json
index 86228f0..c7c8b0b 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "homepage": "https://dephpend.com",
     "bin": ["bin/dephpend", "bin/php-trace"],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "nikic/php-parser": "^4.0",
         "symfony/console": "^4 || ^5",
         "symfony/event-dispatcher": "^4 || ^5"
diff --git a/src/Analyser/XDebugFunctionTraceAnalyser.php b/src/Analyser/XDebugFunctionTraceAnalyser.php
index d00e98b..c76df68 100644
--- a/src/Analyser/XDebugFunctionTraceAnalyser.php
+++ b/src/Analyser/XDebugFunctionTraceAnalyser.php
@@ -30,7 +30,7 @@ public function __construct(DependencyFactory $dependencyFactory)
 
     public function analyse(\SplFileInfo $file) : DependencyMap
     {
-        $fileHandle = @fopen($file->getPathname(), 'r');
+        $fileHandle = !empty($file->getPathname()) ? @fopen($file->getPathname(), 'r') : false;
         if (!$fileHandle) {
             throw new \InvalidArgumentException('Unable to open trace file for reading');
         }
diff --git a/tests/unit/Util/DependencyContainerTest.php b/tests/unit/Util/DependencyContainerTest.php
index ae23367..b77e9c3 100644
--- a/tests/unit/Util/DependencyContainerTest.php
+++ b/tests/unit/Util/DependencyContainerTest.php
@@ -25,7 +25,7 @@ public function provideMethods(): array
             if (!$method->hasReturnType()) {
                 continue;
             }
-            $methods[] = [$method->getName(), (string) $method->getReturnType()];
+            $methods[] = [$method->getName(), $method->getReturnType()->getName()];
         }
         return $methods;
     }