diff --git a/tester/v1/openapi.yaml b/tester/v1/openapi.yaml
index 6aa107b..46fb822 100644
--- a/tester/v1/openapi.yaml
+++ b/tester/v1/openapi.yaml
@@ -76,6 +76,19 @@ paths:
   /contests:
     get:
       operationId: ListContests
+      parameters:
+        - name: page
+          in: query
+          required: true
+          schema:
+            type: integer
+            format: int32
+        - name: pageSize
+          in: query
+          required: true
+          schema:
+            type: integer
+            format: int32
       security:
         - bearerAuth: [ ]
       responses:
@@ -344,15 +357,42 @@ components:
         updated_at:
           type: string
           format: date-time
+    ContestsListItem:
+      type: object
+      required:
+        - id
+        - title
+        - created_at
+        - updated_at
+      properties:
+        id:
+          type: integer
+          format: int32
+        title:
+          type: string
+        created_at:
+          type: string
+          format: date-time
+        updated_at:
+          type: string
+          format: date-time
     ListContestsResponse:
       type: object
       required:
         - contests
+        - page
+        - max_page
       properties:
         contests:
           type: array
           items:
-            $ref: '#/components/schemas/Contest'
+            $ref: '#/components/schemas/ContestsListItem'
+        page:
+          type: integer
+          format: int32
+        max_page:
+          type: integer
+          format: int32
     CreateContestResponse:
       type: object
       required: