diff --git a/classes/mutex/SemaphoreMutex.php b/classes/mutex/SemaphoreMutex.php
index 006d7989..13f94bdb 100644
--- a/classes/mutex/SemaphoreMutex.php
+++ b/classes/mutex/SemaphoreMutex.php
@@ -18,7 +18,7 @@
 class SemaphoreMutex extends LockMutex
 {
     /**
-     * @var resource The semaphore id.
+     * @var \SysvSemaphore|resource The semaphore id.
      */
     private $semaphore;
 
@@ -33,12 +33,12 @@ class SemaphoreMutex extends LockMutex
      * $mutex     = new SemaphoreMutex($semaphore);
      * </code>
      *
-     * @param resource $semaphore The semaphore id.
+     * @param \SysvSemaphore|resource $semaphore The semaphore id.
      * @throws \InvalidArgumentException The semaphore id is not a valid resource.
      */
     public function __construct($semaphore)
     {
-        if (!is_resource($semaphore)) {
+        if (!$semaphore instanceof \SysvSemaphore && !is_resource($semaphore)) {
             throw new InvalidArgumentException('The semaphore id is not a valid resource.');
         }
         $this->semaphore = $semaphore;
diff --git a/composer.json b/composer.json
index b91c1e56..73d571a8 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
         }
     },
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "psr/log": "^1"
     },
     "require-dev": {
@@ -55,7 +55,7 @@
         "eloquent/liberator": "^2.0",
         "friendsofphp/php-cs-fixer": "^2.16",
         "johnkary/phpunit-speedtrap": "^3.0",
-        "mikey179/vfsstream": "^1.6",
+        "mikey179/vfsstream": "^1.6.7",
         "php-mock/php-mock-phpunit": "^2.1",
         "phpstan/phpstan": "^0.12.58",
         "phpunit/phpunit": "^9.4",
diff --git a/tests/mutex/MutexConcurrencyTest.php b/tests/mutex/MutexConcurrencyTest.php
index c3e908ff..b25d2ed5 100644
--- a/tests/mutex/MutexConcurrencyTest.php
+++ b/tests/mutex/MutexConcurrencyTest.php
@@ -252,7 +252,7 @@ public function provideMutexFactories()
 
             'semaphore' => [function ($timeout = 3) use ($filename): Mutex {
                 $semaphore = sem_get(ftok($filename, 'b'));
-                $this->assertTrue(is_resource($semaphore));
+                $this->assertTrue($semaphore instanceof \SysvSemaphore || is_resource($semaphore)); // @phpstan-ignore-line
 
                 return new SemaphoreMutex($semaphore);
             }],
@@ -290,10 +290,13 @@ function (string $uri): Redis {
                                 $redis = new Redis();
 
                                 $uri = parse_url($uri);
-                                if (!empty($uri['port'])) {
-                                    $redis->connect($uri['host'], $uri['port']);
-                                } else {
-                                    $redis->connect($uri['host']);
+                                $redis->connect($uri['host'], $uri['port'] ?? 6379);
+                                if (!empty($uri['pass'])) {
+                                    $redis->auth(
+                                        empty($uri['user'])
+                                        ? $uri['pass']
+                                        : [$uri['user'], $uri['pass']]
+                                    );
                                 }
 
                                 return $redis;
diff --git a/tests/mutex/MutexTest.php b/tests/mutex/MutexTest.php
index 64d424ff..d5d04375 100644
--- a/tests/mutex/MutexTest.php
+++ b/tests/mutex/MutexTest.php
@@ -133,10 +133,13 @@ function ($uri) {
                                 $redis = new Redis();
 
                                 $uri = parse_url($uri);
-                                if (!empty($uri['port'])) {
-                                    $redis->connect($uri['host'], $uri['port']);
-                                } else {
-                                    $redis->connect($uri['host']);
+                                $redis->connect($uri['host'], $uri['port'] ?? 6379);
+                                if (!empty($uri['pass'])) {
+                                    $redis->auth(
+                                        empty($uri['user'])
+                                        ? $uri['pass']
+                                        : [$uri['user'], $uri['pass']]
+                                    );
                                 }
 
                                 return $redis;
diff --git a/tests/mutex/PHPRedisMutexTest.php b/tests/mutex/PHPRedisMutexTest.php
index 28457e5f..01b82e5b 100644
--- a/tests/mutex/PHPRedisMutexTest.php
+++ b/tests/mutex/PHPRedisMutexTest.php
@@ -74,10 +74,13 @@ public function eval($script, $args = [], $numKeys = 0)
                 }
             };
 
-            if (!empty($uri['port'])) {
-                $connection->connect($uri['host'], $uri['port']);
-            } else {
-                $connection->connect($uri['host']);
+            $connection->connect($uri['host'], $uri['port'] ?? 6379);
+            if (!empty($uri['pass'])) {
+                $connection->auth(
+                    empty($uri['user'])
+                    ? $uri['pass']
+                    : [$uri['user'], $uri['pass']]
+                );
             }
 
             $connection->flushAll(); // Clear any existing locks.