diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3c5ae8..fa30861 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,6 +14,7 @@ jobs:
           - ubuntu-24.04
           - windows-2022
         php:
+          - 8.5
           - 8.4
           - 8.3
           - 8.2
diff --git a/src/Process.php b/src/Process.php
index 406e417..86c334a 100644
--- a/src/Process.php
+++ b/src/Process.php
@@ -121,7 +121,7 @@ public function __construct($cmd, $cwd = null, $env = null, $fds = null)
         if (null !== $env) {
             $this->env = array();
             foreach ($env as $key => $value) {
-                $this->env[(binary) $key] = (binary) $value;
+                $this->env[(string) $key] = (string) $value;
             }
         }
 
diff --git a/tests/AbstractProcessTest.php b/tests/AbstractProcessTest.php
index 4a81d0b..8afe39b 100644
--- a/tests/AbstractProcessTest.php
+++ b/tests/AbstractProcessTest.php
@@ -70,7 +70,9 @@ public function testStartWithoutLoopAssignsLoopAutomatically()
         $process->start();
 
         $ref = new \ReflectionProperty($process->stdin, 'loop');
-        $ref->setAccessible(true);
+        if (PHP_VERSION_ID < 80100) {
+            $ref->setAccessible(true);
+        }
         $loop = $ref->getValue($process->stdin);
 
         $this->assertInstanceOf('React\EventLoop\LoopInterface', $loop);