diff --git a/klabis-api-spec.yaml b/klabis-api-spec.yaml
index c1d044b..a557d87 100644
--- a/klabis-api-spec.yaml
+++ b/klabis-api-spec.yaml
@@ -1,4 +1,4 @@
-openapi: 3.1.0
+openapi: 3.0.0
 info:
   title: Klabis API
   description: |