diff --git a/schemas/v3.0/schema.yaml b/schemas/v3.0/schema.yaml
index 13e47ff08d..dea243ec63 100644
--- a/schemas/v3.0/schema.yaml
+++ b/schemas/v3.0/schema.yaml
@@ -20,6 +20,7 @@ properties:
       $ref: '#/definitions/Server'
   security:
     type: array
+    minItems: 1
     items:
       $ref: '#/definitions/SecurityRequirement'
   tags:
@@ -553,6 +554,7 @@ definitions:
         default: false
       security:
         type: array
+        minItems: 1
         items:
           $ref: '#/definitions/SecurityRequirement'
       servers: