diff --git a/build.sbt b/build.sbt
index bfdc27e..c7ff90c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ import sbtversionpolicy.withsbtrelease.ReleaseVersion
 
 // dependency versions
 val contentEntityVersion = "5.0.0"
-val contentAtomVersion = "13.0.0"
+val contentAtomVersion = "15.1.0-PREVIEW.glspike-multimedia-atom.2026-09-01T2238.c8b18f89"
 val storyPackageVersion = "2.2.0"
 val thriftVersion = "0.24.0"
 val scroogeVersion = "22.1.0" // update plugins too if this version changes
diff --git a/json/src/main/scala/com/gu/contentapi/json/CirceDecoders.scala b/json/src/main/scala/com/gu/contentapi/json/CirceDecoders.scala
index fce68bc..0300923 100644
--- a/json/src/main/scala/com/gu/contentapi/json/CirceDecoders.scala
+++ b/json/src/main/scala/com/gu/contentapi/json/CirceDecoders.scala
@@ -203,6 +203,10 @@ object CirceDecoders {
   implicit val audioAtomDecoder: Decoder[audio.AudioAtom] = deriveDecoder
   implicit val offPlatformDecoder: Decoder[audio.OffPlatform] = deriveDecoder
   implicit val emailSignUpAtomDecoder: Decoder[emailsignup.EmailSignUpAtom] = deriveDecoder
+  implicit val multimediaSlideshowMediaReferenceDecoder: Decoder[multimediaslideshow.MediaReference] = deriveDecoder
+  implicit val multimediaSlideshowSlideContentDecoder: Decoder[multimediaslideshow.SlideContent] = deriveDecoder
+  implicit val multimediaSlideshowSlideDecoder: Decoder[multimediaslideshow.Slide] = deriveDecoder
+  implicit val multimediaSlideshowAtomDecoder: Decoder[multimediaslideshow.MultimediaSlideshowAtom] = deriveDecoder
   implicit val atomDecoder: Decoder[contentatom.Atom] = deriveDecoder
   implicit val contentChangeDetailsDecoder: Decoder[contentatom.ContentChangeDetails] = deriveDecoder
   implicit val changeRecordDecoder: Decoder[contentatom.ChangeRecord] = deriveDecoder
diff --git a/json/src/main/scala/com/gu/contentapi/json/CirceEncoders.scala b/json/src/main/scala/com/gu/contentapi/json/CirceEncoders.scala
index 70e1f65..3cf2c2c 100644
--- a/json/src/main/scala/com/gu/contentapi/json/CirceEncoders.scala
+++ b/json/src/main/scala/com/gu/contentapi/json/CirceEncoders.scala
@@ -152,6 +152,10 @@ object CirceEncoders {
   implicit val audioAtomEncoder: Encoder[audio.AudioAtom] = deriveEncoder
   implicit val offPlatformEncoder: Encoder[audio.OffPlatform] = deriveEncoder
   implicit val emailSignUpAtomEncoder: Encoder[emailsignup.EmailSignUpAtom] = deriveEncoder
+  implicit val multimediaSlideshowMediaReferenceEncoder: Encoder[multimediaslideshow.MediaReference] = deriveEncoder
+  implicit val multimediaSlideshowSlideContentEncoder: Encoder[multimediaslideshow.SlideContent] = deriveEncoder
+  implicit val multimediaSlideshowSlideEncoder: Encoder[multimediaslideshow.Slide] = deriveEncoder
+  implicit val multimediaSlideshowAtomEncoder: Encoder[multimediaslideshow.MultimediaSlideshowAtom] = deriveEncoder
   implicit val atomEncoder: Encoder[contentatom.Atom] = deriveEncoder
   implicit val contentChangeDetailsEncoder: Encoder[contentatom.ContentChangeDetails] = deriveEncoder
   implicit val changeRecordEncoder: Encoder[contentatom.ChangeRecord] = deriveEncoder
diff --git a/models/src/main/thrift/content/v1.thrift b/models/src/main/thrift/content/v1.thrift
index 203975d..99eefd3 100644
--- a/models/src/main/thrift/content/v1.thrift
+++ b/models/src/main/thrift/content/v1.thrift
@@ -1859,6 +1859,8 @@ struct Atoms {
     16: optional list<contentatom.Atom> audios
 
     17: optional list<contentatom.Atom> emailsignups
+
+    18: optional list<contentatom.Atom> multimediaslideshows
 }
 
 struct ContentStats {
@@ -2305,6 +2307,8 @@ struct ItemResponse {
     37: optional contentatom.Atom emailsignup
 
     38: optional list<Content> deeplyRead
+
+    39: optional contentatom.Atom multimediaslideshow
 }
 
 struct TagsResponse {