--- a/src/PSR7/SpecFinder.php
+++ b/src/PSR7/SpecFinder.php
@@ -15,6 +15,7 @@ use cebe\openapi\spec\PathItem;
 use cebe\openapi\spec\Reference;
 use cebe\openapi\spec\Response as ResponseSpec;
 use cebe\openapi\spec\SecurityRequirement;
+use cebe\openapi\spec\SecurityRequirements;
 use cebe\openapi\spec\SecurityScheme;
 use League\OpenAPIValidation\PSR7\Exception\NoCallback;
 use League\OpenAPIValidation\PSR7\Exception\NoOperation;
@@ -160,6 +161,11 @@ final class SpecFinder
             $securitySpecs = $this->openApi->security;
         }
 
+        // Handle SecurityRequirements object (cebe/php-openapi >= 1.8.0).
+        if ($securitySpecs instanceof SecurityRequirements) {
+            return $securitySpecs->getRequirements();
+        }
+
         return $securitySpecs;
     }