diff --git a/atom-publisher-lib/src/main/scala/com/gu/atom/util/JsonSupport.scala b/atom-publisher-lib/src/main/scala/com/gu/atom/util/JsonSupport.scala
index d9132e9..7729c84 100644
--- a/atom-publisher-lib/src/main/scala/com/gu/atom/util/JsonSupport.scala
+++ b/atom-publisher-lib/src/main/scala/com/gu/atom/util/JsonSupport.scala
@@ -66,8 +66,8 @@ object JsonSupport {
         val fixedJson = {
           val nestedDataFieldName = atomType.toLowerCase
 
-          //Special case for commonsDivision because the scrooge enum value loses the casing
-          if (data(nestedDataFieldName).nonEmpty || nestedDataFieldName == "commonsdivision") c.value
+          //Special case for commonsDivision and multimediaSlideshow because the scrooge enum value loses the casing
+          if (data(nestedDataFieldName).nonEmpty || nestedDataFieldName == "commonsdivision" || nestedDataFieldName == "multimediaslideshow") c.value
           else {
             //Add the union type name under `data`
             val newData = JsonObject.fromIterable(Seq(nestedDataFieldName -> dataJson))
diff --git a/project/BuildVars.scala b/project/BuildVars.scala
index f003701..d86ffbf 100644
--- a/project/BuildVars.scala
+++ b/project/BuildVars.scala
@@ -2,7 +2,7 @@ import sbt._
 
 object BuildVars {
   lazy val awsVersion         = "1.12.680"
-  lazy val contentAtomVersion = "12.0.1"
+  lazy val contentAtomVersion = "15.1.0"
   lazy val scroogeVersion     = "22.1.0"
   lazy val playVersion        = "3.0.10"
   lazy val mockitoVersion     = "4.11.0"