diff --git a/rollup.yaml b/rollup.yaml
index dab444e..574ee83 100644
--- a/rollup.yaml
+++ b/rollup.yaml
@@ -2,7 +2,7 @@ openapi: 3.0.0
 
 info:
   title: Cartesi Rollup HTTP API
-  version: 0.9
+  version: '0.9.0'
   license:
     name: Apache-2.0
     url: https://www.apache.org/licenses/LICENSE-2.0.html