diff --git a/docs/antora.yml b/docs/antora.yml
index 913bb8f4e8..48ef47663e 100644
--- a/docs/antora.yml
+++ b/docs/antora.yml
@@ -1,3 +1,3 @@
 name: ROOT
-version: 6.0
+version: '6.0'
 prerelease: true