diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6cee0ca..24e45e3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [5.3, 5.4, 5.5, 5.6, '7.0', 7.1, 7.2, 7.3, 7.4, '8.0', 8.1, 8.2, 8.3, 8.4]
+        php: [5.3, 5.4, 5.5, 5.6, '7.0', 7.1, 7.2, 7.3, 7.4, '8.0', 8.1, 8.2, 8.3, 8.4, 8.5]
         flags: ['']
         include:
           - { php: 5.3, flags: --prefer-lowest }
diff --git a/composer.json b/composer.json
index 01dd8cb..ebdc4ef 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,9 @@
     "autoload": {
         "files": [
             "./files/ComparisonFailure.php"
+        ],
+        "exclude-from-classmap": [
+            "vendor/sebastian/comparator/src/ComparisonFailure.php"
         ]
     },
     "autoload-dev": {