diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 665e55c..1bd2979 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -38,6 +38,10 @@ jobs:
                       stable: true
                       coverage: false
                       composer-flags: '--prefer-lowest'
+                    - php: '8.3'
+                      stable: false
+                      coverage: false
+                      composer-flags: '--ignore-platform-req=php+'
 
         steps:
             - uses: actions/checkout@v2
diff --git a/src/Json5Decoder.php b/src/Json5Decoder.php
index a876894..eb51e1c 100644
--- a/src/Json5Decoder.php
+++ b/src/Json5Decoder.php
@@ -624,7 +624,7 @@ private static function getEscapee(string $ch): ?string
             case 'r':  return "\r";
             case 't':  return "\t";
             default:   return null;
-            // @codingStandardsIgnoreEnd
+                // @codingStandardsIgnoreEnd
         }
     }
 }