diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0644638..81e542b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,9 +20,10 @@ jobs:
           - '8.2'
           - '8.3'
           - '8.4'
+          - '8.5'
         future-release: [false]
         include:
-          - php-version: '8.5'
+          - php-version: '8.6'
             future-release: true
       fail-fast: false
     name: PHP ${{ matrix.php-version }}
diff --git a/README.md b/README.md
index 7048713..1632684 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Installation instructions to use the `composer` command can be found on https://
 
 ### 📋 Requirements
 
-PHP Curl Class works with PHP versions 8.4, 8.3, 8.2, 8.1, and 8.0.
+PHP Curl Class works with PHP versions 8.5, 8.4, 8.3, 8.2, 8.1, and 8.0.
 
 ### 🚀 Quick Start and Examples
 
diff --git a/tests/.php-cs-fixer.php b/tests/.php-cs-fixer.php
index b9014c2..44e14a5 100644
--- a/tests/.php-cs-fixer.php
+++ b/tests/.php-cs-fixer.php
@@ -4,6 +4,13 @@ $finder = PhpCsFixer\Finder::create()
     ->in(dirname(__DIR__));
 
 $config = new PhpCsFixer\Config();
+
+// Turn on unsupported PHP versions when the method exists for compatibility
+// with older PHP CS Fixer versions.
+if (is_callable([$config, 'setUnsupportedPhpVersionAllowed'])) {
+    $config->setUnsupportedPhpVersionAllowed(true);
+}
+
 $config
     ->setRiskyAllowed(true)
     ->setRules([
diff --git a/tests/run.sh b/tests/run.sh
index e0b8432..fa15f56 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -20,7 +20,17 @@ if [[ "${CI}" == "true" ]]; then
     #       - vimeo/psalm[6.5.1, ..., 6.8.8] require php ~8.1.31 || ~8.2.27 || ~8.3.16 || ~8.4.3 -> your php version (8.5.0-dev) does not satisfy that requirement.
     #
     #   Error: Your requirements could not be resolved to an installable set of packages.
-    if ! "${CI_PHP_FUTURE_RELEASE}"; then
+    if "${CI_PHP_FUTURE_RELEASE}"; then
+        install_psalm=false
+    # Skip attempting to install psalm on PHP version 8.5 and higher as psalm
+    # does not yet support these versions.
+    elif [[ $(echo "${CI_PHP_VERSION} >= 8.5" | bc) -eq 1 ]]; then
+        install_psalm=false
+    else
+        install_psalm=true
+    fi
+
+    if ${install_psalm}; then
         composer require --dev "vimeo/psalm:>=5.26.1"
     fi