diff --git a/py/stencila/schema/types.py b/py/stencila/schema/types.py
index f744738d..b8e9ea30 100644
--- a/py/stencila/schema/types.py
+++ b/py/stencila/schema/types.py
@@ -270,7 +270,7 @@ class CodeChunk(CodeBlock):
     assigns: Optional[Array[Union[str, "Variable"]]] = None
     """Variables that the code chunk assigns to."""
 
-    caption: Optional[Union[str, Array["Node"]]] = None
+    caption: Optional[Union[Array["BlockContent"], str]] = None
     """A caption for the CodeChunk."""
 
     declares: Optional[Array[Union[str, "Variable", "Function"]]] = None
@@ -303,7 +303,7 @@ def __init__(
         text: str,
         alters: Optional[Array[str]] = None,
         assigns: Optional[Array[Union[str, "Variable"]]] = None,
-        caption: Optional[Union[str, Array["Node"]]] = None,
+        caption: Optional[Union[Array["BlockContent"], str]] = None,
         declares: Optional[Array[Union[str, "Variable", "Function"]]] = None,
         duration: Optional[float] = None,
         errors: Optional[Array["CodeError"]] = None,
@@ -1519,7 +1519,7 @@ class Figure(CreativeWork):
     and labels for them.
     """
 
-    caption: Optional[Union[str, Array["Node"]]] = None
+    caption: Optional[Union[Array["BlockContent"], str]] = None
     """A caption for the figure."""
 
     label: Optional[str] = None
@@ -1531,7 +1531,7 @@ def __init__(
         about: Optional[Array["Thing"]] = None,
         alternateNames: Optional[Array[str]] = None,
         authors: Optional[Array[Union["Person", "Organization"]]] = None,
-        caption: Optional[Union[str, Array["Node"]]] = None,
+        caption: Optional[Union[Array["BlockContent"], str]] = None,
         comments: Optional[Array["Comment"]] = None,
         content: Optional[Array["Node"]] = None,
         dateAccepted: Optional["Date"] = None,
@@ -3570,7 +3570,7 @@ class Table(CreativeWork):
     """Rows of cells in the table.
 """
 
-    caption: Optional[Union[str, Array["Node"]]] = None
+    caption: Optional[Union[Array["BlockContent"], str]] = None
     """A caption for the table."""
 
     label: Optional[str] = None
@@ -3583,7 +3583,7 @@ def __init__(
         about: Optional[Array["Thing"]] = None,
         alternateNames: Optional[Array[str]] = None,
         authors: Optional[Array[Union["Person", "Organization"]]] = None,
-        caption: Optional[Union[str, Array["Node"]]] = None,
+        caption: Optional[Union[Array["BlockContent"], str]] = None,
         comments: Optional[Array["Comment"]] = None,
         content: Optional[Array["Node"]] = None,
         dateAccepted: Optional["Date"] = None,
diff --git a/r/R/types.R b/r/R/types.R
index d214cca6..04a64022 100644
--- a/r/R/types.R
+++ b/r/R/types.R
@@ -300,7 +300,7 @@ CodeChunk <- function(
   self$type <- as_scalar("CodeChunk")
   self[["alters"]] <- check_property("CodeChunk", "alters", FALSE, missing(alters), Array("character"), alters)
   self[["assigns"]] <- check_property("CodeChunk", "assigns", FALSE, missing(assigns), Array(Union("character", Variable)), assigns)
-  self[["caption"]] <- check_property("CodeChunk", "caption", FALSE, missing(caption), Union("character", Array(Node)), caption)
+  self[["caption"]] <- check_property("CodeChunk", "caption", FALSE, missing(caption), Union(Array(BlockContent), "character"), caption)
   self[["declares"]] <- check_property("CodeChunk", "declares", FALSE, missing(declares), Array(Union("character", Variable, Function)), declares)
   self[["duration"]] <- check_property("CodeChunk", "duration", FALSE, missing(duration), "numeric", duration)
   self[["errors"]] <- check_property("CodeChunk", "errors", FALSE, missing(errors), Array(CodeError), errors)
@@ -1719,7 +1719,7 @@ Figure <- function(
     version = version
   )
   self$type <- as_scalar("Figure")
-  self[["caption"]] <- check_property("Figure", "caption", FALSE, missing(caption), Union("character", Array(Node)), caption)
+  self[["caption"]] <- check_property("Figure", "caption", FALSE, missing(caption), Union(Array(BlockContent), "character"), caption)
   self[["label"]] <- check_property("Figure", "label", FALSE, missing(label), "character", label)
   class(self) <- c(class(self), "Figure")
   self
@@ -3937,7 +3937,7 @@ Table <- function(
   )
   self$type <- as_scalar("Table")
   self[["rows"]] <- check_property("Table", "rows", TRUE, missing(rows), Array(TableRow), rows)
-  self[["caption"]] <- check_property("Table", "caption", FALSE, missing(caption), Union("character", Array(Node)), caption)
+  self[["caption"]] <- check_property("Table", "caption", FALSE, missing(caption), Union(Array(BlockContent), "character"), caption)
   self[["label"]] <- check_property("Table", "label", FALSE, missing(label), "character", label)
   class(self) <- c(class(self), "Table")
   self
diff --git a/schema/CodeChunk.schema.yaml b/schema/CodeChunk.schema.yaml
index 3909e022..b910dd65 100644
--- a/schema/CodeChunk.schema.yaml
+++ b/schema/CodeChunk.schema.yaml
@@ -13,10 +13,10 @@ properties:
       An array of nodes or, to be compatible with https://schema.org/caption,
       a string.
     anyOf:
-      - type: string
       - type: array
         items:
-          $ref: Node
+          $ref: BlockContent
+      - type: string
   label:
     '@id': stencila:label
     description: A short label for the CodeChunk.
diff --git a/schema/Figure.schema.yaml b/schema/Figure.schema.yaml
index aaab0913..bc99debf 100644
--- a/schema/Figure.schema.yaml
+++ b/schema/Figure.schema.yaml
@@ -13,10 +13,10 @@ properties:
       An array of nodes or, to be compatible with https://schema.org/caption,
       a string.
     anyOf:
-      - type: string
       - type: array
         items:
-          $ref: Node
+          $ref: BlockContent
+      - type: string
   label:
     '@id': stencila:label
     description: A short label for the figure.
diff --git a/schema/Table.schema.yaml b/schema/Table.schema.yaml
index 9c571439..45024fda 100644
--- a/schema/Table.schema.yaml
+++ b/schema/Table.schema.yaml
@@ -13,10 +13,10 @@ properties:
       An array of nodes or, to be compatible with https://schema.org/caption,
       a string.
     anyOf:
-      - type: string
       - type: array
         items:
-          $ref: Node
+          $ref: BlockContent
+      - type: string
   label:
     '@id': stencila:label
     description: A short label for the table.