diff --git a/packages/pl-api/lib/client/experimental.ts b/packages/pl-api/lib/client/experimental.ts
index ea10bfe12..e1c03bdc5 100644
--- a/packages/pl-api/lib/client/experimental.ts
+++ b/packages/pl-api/lib/client/experimental.ts
@@ -98,7 +98,7 @@ const experimental = (client: PlApiBaseClient) => {
               description: params.note,
               membership: 'public',
             },
-            contentType: params.avatar || params.header ? '' : undefined,
+            formData: !!(params.avatar || params.header),
           });
 
           if (response.json?.id) {
@@ -108,7 +108,7 @@ const experimental = (client: PlApiBaseClient) => {
           response = await client.request('/api/v1/groups', {
             method: 'POST',
             body: params,
-            contentType: params.avatar || params.header ? '' : undefined,
+            formData: !!(params.avatar || params.header),
           });
         }
 
@@ -133,7 +133,7 @@ const experimental = (client: PlApiBaseClient) => {
         const response = await client.request(`/api/v1/groups/${groupId}`, {
           method: 'PUT',
           body: params,
-          contentType: params.avatar || params.header ? '' : undefined,
+          formData: !!(params.avatar || params.header),
         });
 
         return v.parse(groupSchema, response.json);
diff --git a/packages/pl-api/lib/client/media.ts b/packages/pl-api/lib/client/media.ts
index 0fdc03518..8028dd330 100644
--- a/packages/pl-api/lib/client/media.ts
+++ b/packages/pl-api/lib/client/media.ts
@@ -42,7 +42,7 @@ const media = (client: PlApiBaseClient) => ({
     const response = await client.request(`/api/v1/media/${attachmentId}`, {
       method: 'PUT',
       body: params,
-      contentType: params.thumbnail ? '' : undefined,
+      formData: !!params.thumbnail,
     });
 
     return v.parse(mediaAttachmentSchema, response.json);
diff --git a/packages/pl-api/lib/client/settings.ts b/packages/pl-api/lib/client/settings.ts
index 9a6847d2e..b61eae408 100644
--- a/packages/pl-api/lib/client/settings.ts
+++ b/packages/pl-api/lib/client/settings.ts
@@ -81,13 +81,12 @@ const settings = (client: PlApiBaseClient) => ({
 
     const response = await client.request('/api/v1/accounts/update_credentials', {
       method: 'PATCH',
-      contentType:
+      formData: !!(
         client.features.version.software === GOTOSOCIAL ||
         client.features.version.software === ICESHRIMP_NET ||
         params.avatar ||
         params.header
-          ? ''
-          : undefined,
+      ),
       body: params,
     });