diff --git a/.changeset/five-experts-wink.md b/.changeset/five-experts-wink.md
new file mode 100644
index 0000000000..4820091246
--- /dev/null
+++ b/.changeset/five-experts-wink.md
@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa": patch
+---
+
+fix(medusa): Support additional data on admin/collections
diff --git a/packages/medusa/src/api/admin/collections/[id]/route.ts b/packages/medusa/src/api/admin/collections/[id]/route.ts
index f898092b54..b9b0eede8e 100644
--- a/packages/medusa/src/api/admin/collections/[id]/route.ts
+++ b/packages/medusa/src/api/admin/collections/[id]/route.ts
@@ -1,16 +1,16 @@
-import {
-  AuthenticatedMedusaRequest,
-  MedusaResponse,
-} from "@medusajs/framework/http"
 import {
   deleteCollectionsWorkflow,
   updateCollectionsWorkflow,
 } from "@medusajs/core-flows"
+import {
+  AuthenticatedMedusaRequest,
+  MedusaResponse,
+} from "@medusajs/framework/http"
 
-import { AdminUpdateCollectionType } from "../validators"
-import { refetchCollection } from "../helpers"
-import { HttpTypes } from "@medusajs/framework/types"
+import { AdditionalData, HttpTypes } from "@medusajs/framework/types"
 import { MedusaError } from "@medusajs/framework/utils"
+import { refetchCollection } from "../helpers"
+import { AdminUpdateCollectionType } from "../validators"
 
 export const GET = async (
   req: AuthenticatedMedusaRequest,
@@ -26,7 +26,7 @@ export const GET = async (
 }
 
 export const POST = async (
-  req: AuthenticatedMedusaRequest<AdminUpdateCollectionType>,
+  req: AuthenticatedMedusaRequest<AdminUpdateCollectionType & AdditionalData>,
   res: MedusaResponse<HttpTypes.AdminCollectionResponse>
 ) => {
   const existingCollection = await refetchCollection(req.params.id, req.scope, [
@@ -39,10 +39,13 @@ export const POST = async (
     )
   }
 
+  const { additional_data, ...rest } = req.validatedBody
+
   await updateCollectionsWorkflow(req.scope).run({
     input: {
       selector: { id: req.params.id },
-      update: req.validatedBody,
+      update: rest,
+      additional_data,
     },
   })
 
diff --git a/packages/medusa/src/api/admin/collections/route.ts b/packages/medusa/src/api/admin/collections/route.ts
index 74e56708c9..8279402bec 100644
--- a/packages/medusa/src/api/admin/collections/route.ts
+++ b/packages/medusa/src/api/admin/collections/route.ts
@@ -1,16 +1,15 @@
+import { createCollectionsWorkflow } from "@medusajs/core-flows"
 import {
   AuthenticatedMedusaRequest,
   MedusaResponse,
 } from "@medusajs/framework/http"
-
-import { createCollectionsWorkflow } from "@medusajs/core-flows"
+import { AdditionalData, HttpTypes } from "@medusajs/framework/types"
 import {
   ContainerRegistrationKeys,
   remoteQueryObjectFromString,
 } from "@medusajs/framework/utils"
-import { AdminCreateCollectionType } from "./validators"
 import { refetchCollection } from "./helpers"
-import { HttpTypes } from "@medusajs/framework/types"
+import { AdminCreateCollectionType } from "./validators"
 
 export const GET = async (
   req: AuthenticatedMedusaRequest<HttpTypes.AdminCollectionListParams>,
@@ -38,17 +37,13 @@ export const GET = async (
 }
 
 export const POST = async (
-  req: AuthenticatedMedusaRequest<AdminCreateCollectionType>,
+  req: AuthenticatedMedusaRequest<AdminCreateCollectionType & AdditionalData>,
   res: MedusaResponse<HttpTypes.AdminCollectionResponse>
 ) => {
-  const input = [
-    {
-      ...req.validatedBody,
-    },
-  ]
+  const { additional_data, ...rest } = req.validatedBody
 
   const { result } = await createCollectionsWorkflow(req.scope).run({
-    input: { collections: input },
+    input: { collections: [rest], additional_data },
   })
 
   const collection = await refetchCollection(
diff --git a/packages/medusa/src/api/admin/collections/validators.ts b/packages/medusa/src/api/admin/collections/validators.ts
index 72b7e746f5..e6c885f19f 100644
--- a/packages/medusa/src/api/admin/collections/validators.ts
+++ b/packages/medusa/src/api/admin/collections/validators.ts
@@ -1,10 +1,11 @@
 import { z } from "zod"
+import { applyAndAndOrOperators } from "../../utils/common-validators"
 import {
   createFindParams,
   createOperatorMap,
   createSelectParams,
+  WithAdditionalData,
 } from "../../utils/validators"
-import { applyAndAndOrOperators } from "../../utils/common-validators"
 
 export const AdminGetCollectionParams = createSelectParams()
 
@@ -27,16 +28,20 @@ export const AdminGetCollectionsParams = createFindParams({
   .merge(AdminGetCollectionsParamsFields)
   .merge(applyAndAndOrOperators(AdminGetCollectionsParamsFields))
 
-export type AdminCreateCollectionType = z.infer<typeof AdminCreateCollection>
-export const AdminCreateCollection = z.object({
+export type AdminCreateCollectionType = z.infer<typeof CreateCollection>
+export const CreateCollection = z.object({
   title: z.string(),
   handle: z.string().optional(),
   metadata: z.record(z.unknown()).nullish(),
 })
 
-export type AdminUpdateCollectionType = z.infer<typeof AdminUpdateCollection>
-export const AdminUpdateCollection = z.object({
+export const AdminCreateCollection = WithAdditionalData(CreateCollection)
+
+export type AdminUpdateCollectionType = z.infer<typeof UpdateCollection>
+export const UpdateCollection = z.object({
   title: z.string().optional(),
   handle: z.string().optional(),
   metadata: z.record(z.unknown()).nullish(),
 })
+
+export const AdminUpdateCollection = WithAdditionalData(UpdateCollection)