diff --git a/conf.yaml b/conf.yaml
index 4bb3fcd228db9..a103e1155a27c 100644
--- a/conf.yaml
+++ b/conf.yaml
@@ -1048,10 +1048,10 @@ contents:
                 path:   docs/asciidoc
           - title:      Elastic Common Schema (ECS) Reference
             prefix:     en/ecs
-            # Please do not update current to 8.18
-            current:    8.17
-            branches:   [ 8.17, 8.16, 8.11, 8.10, 8.9, 8.8, 8.7, 8.6, 8.5, 8.4, 8.3, 8.2, 8.1, 8.0, 1.12, 1.11, 1.10, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0 ]
-            live:       [ 8.17,  1.12 ]
+            # Please do not update current to 9.1
+            current:    9.0
+            branches:   [ 9.0, 8.17, 8.16, 8.11, 8.10, 8.9, 8.8, 8.7, 8.6, 8.5, 8.4, 8.3, 8.2, 8.1, 8.0, 1.12, 1.11, 1.10, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0 ]
+            live:       [ 9.0 ]
             index:      docs/index.asciidoc
             chunk:      2
             tags:       Elastic Common Schema (ECS)/Reference
diff --git a/shared/versions/stack/9.0.asciidoc b/shared/versions/stack/9.0.asciidoc
index d53ee19ccacb5..6ffe1eef5bfd0 100644
--- a/shared/versions/stack/9.0.asciidoc
+++ b/shared/versions/stack/9.0.asciidoc
@@ -13,7 +13,7 @@ bare_version never includes -alpha or -beta
 :prev-major-version:     8.x
 :prev-major-last:        8.17
 :major-version-only:     9
-:ecs_version:            8.17
+:ecs_version:            9.0
 :esf_version:            master
 :ece-version-link:       current
 //////////
diff --git a/shared/versions/stack/master.asciidoc b/shared/versions/stack/master.asciidoc
index 53c2e9e09a7a5..e9bc5b7742978 100644
--- a/shared/versions/stack/master.asciidoc
+++ b/shared/versions/stack/master.asciidoc
@@ -13,7 +13,7 @@ bare_version never includes -alpha or -beta
 :prev-major-version:     8.x
 :prev-major-last:        8.18
 :major-version-only:     9
-:ecs_version:            8.17
+:ecs_version:            9.0
 :esf_version:            master
 :ece-version-link:       current
 //////////