diff --git a/.github/workflows/test-unit.yml b/.github/workflows/test-unit.yml
index df0c79f..8bd57de 100644
--- a/.github/workflows/test-unit.yml
+++ b/.github/workflows/test-unit.yml
@@ -64,7 +64,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
         type: ['Phpunit', 'Phpunit Lowest']
         include:
           - php: 'latest'
diff --git a/composer.json b/composer.json
index 3c96fd1..1a950ba 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
     ],
     "homepage": "https://github.com/malkusch/lock",
     "require": {
-        "php": ">=7.4 <8.5",
+        "php": ">=7.4 <8.6",
         "psr/log": "^1.0 || ^2.0 || ^3.0",
         "symfony/polyfill-php80": "^1.28"
     },
@@ -59,7 +59,7 @@
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpunit": "^9.5.25 || ^10.0 || ^11.0",
         "predis/predis": "^1.1.8 || ^2.0",
-        "spatie/async": "^1.5"
+        "spatie/async": "^1.5 || ^1.8"
     },
     "suggest": {
         "ext-igbinary": "To use this library with PHP Redis igbinary serializer enabled.",
diff --git a/src/Mutex/DistributedMutex.php b/src/Mutex/DistributedMutex.php
index 8ccc862..e84c182 100644
--- a/src/Mutex/DistributedMutex.php
+++ b/src/Mutex/DistributedMutex.php
@@ -57,7 +57,13 @@ protected function acquireWithToken(string $key, float $expireTimeout)
         $exception = null;
         foreach ($this->getMutexesInRandomOrder() as $index => $mutex) {
             try {
-                if ($this->acquireMutex($mutex, $key, $acquireTimeout - (microtime(true) - $startTs), $expireTimeout)) {
+                $remainingTimeout = $acquireTimeout - (microtime(true) - $startTs);
+                // Prevent INF/NAN from being passed to acquireMutex
+                if (is_infinite($remainingTimeout) || is_nan($remainingTimeout) || $remainingTimeout < 0) {
+                    $remainingTimeout = 0.0;
+                }
+
+                if ($this->acquireMutex($mutex, $key, $remainingTimeout, $expireTimeout)) {
                     $acquiredIndexes[] = $index;
                 }
             } catch (LockAcquireException $exception) {
diff --git a/src/Util/LockUtil.php b/src/Util/LockUtil.php
index d07add1..2ff3d33 100644
--- a/src/Util/LockUtil.php
+++ b/src/Util/LockUtil.php
@@ -71,11 +71,13 @@ public function castFloatToInt(float $value): int
      */
     public function formatTimeout(float $value): string
     {
+        if (!is_finite($value) || is_nan($value)) {
+            return '0.0';
+        }
         $res = (string) round($value, 6);
-        if (\is_finite($value) && strpos($res, '.') === false) {
+        if (strpos($res, '.') === false) {
             $res .= '.0';
         }
-
         return $res;
     }
 }