diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58cabe1..bf428ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Added `/@username` routes for profile pages.
 - Allowed to attach image from clipboard.
 - Started using media limits provided by the backend.
+- Send avatar and banner media types to server when updating profile info.
 
 ### Changed
 
diff --git a/src/api/users.ts b/src/api/users.ts
index ba1f52a..da7afba 100644
--- a/src/api/users.ts
+++ b/src/api/users.ts
@@ -233,7 +233,9 @@ export interface ProfileUpdateData {
   display_name: string | null;
   note: string | null;
   avatar: string | null;
+  avatar_media_type: string | null;
   header: string | null;
+  header_media_type: string | null;
   fields_attributes: ProfileFieldAttrs[];
 }
 
diff --git a/src/views/ProfileForm.vue b/src/views/ProfileForm.vue
index 8a0734f..f196275 100644
--- a/src/views/ProfileForm.vue
+++ b/src/views/ProfileForm.vue
@@ -125,7 +125,9 @@ const form = $ref<ProfileUpdateData>({
   note: profile.source.note,
   fields_attributes: getFieldsAttributes(),
   avatar: null,
+  avatar_media_type: null,
   header: null,
+  header_media_type: null,
 })
 const images = $ref({
   avatar: profile.avatar,
@@ -165,6 +167,7 @@ async function onFilePicked(fieldName: "avatar" | "header", event: Event) {
   images[fieldName] = imageDataUrl
   const imageData = dataUrlToBase64(imageDataUrl)
   form[fieldName] = imageData.data
+  form[`${fieldName}_media_type`] = imageData.mediaType
 }
 
 function isValidExtraField(index: number): boolean {