diff --git a/packages/mermaid/src/schemas/config.schema.yaml b/packages/mermaid/src/schemas/config.schema.yaml
index 3f3d8bbcc..1bed31e64 100644
--- a/packages/mermaid/src/schemas/config.schema.yaml
+++ b/packages/mermaid/src/schemas/config.schema.yaml
@@ -61,8 +61,9 @@ properties:
     type: string
     enum:
       - default
-      - forest
+      - base
       - dark
+      - forest
       - neutral
       - 'null' # should this be a `null`-type?
     meta:enum: