diff --git a/src/commands/sync.ts b/src/commands/sync.ts
index 0a1e9aa..92051b1 100644
--- a/src/commands/sync.ts
+++ b/src/commands/sync.ts
@@ -106,10 +106,13 @@ export default class Extract extends Base {
     const newMessages = this.provider.getNewMessages();
     if (newMessages.length > 0) {
       showInfo(`New translation keys: ${newMessages.length}`);
-      await this.provider.uploadMessages(newMessages.map(id => this.messages[locales[0]][id]), locales);
-      asyncForEach(locales, locale =>
-        this.provider!.uploadMessages(newMessages.map(id => this.messages[locale][id]), locales),
-      );
+      if (provider === 'locize') {
+        asyncForEach(locales, locale =>
+          this.provider!.uploadMessages(newMessages.map(id => this.messages[locale][id]), locale),
+        );
+      } else {
+        await this.provider.uploadMessages(newMessages.map(id => this.messages[locales[0]][id]), 'en');
+      }
     }
   }
 }
diff --git a/src/providers/locize.ts b/src/providers/locize.ts
index 0824241..876970a 100644
--- a/src/providers/locize.ts
+++ b/src/providers/locize.ts
@@ -43,7 +43,7 @@ export class Locize implements Provider {
     return '';
   }
 
-  async uploadMessages(messages: Message[], locales: string[]) {
+  async uploadMessages(messages: Message[], locale: string) {
     const headers = { Authorization: `Bearer ${this.apiKey}`, 'content-type': 'application/json' };
     const body = messages.reduce(
       (acc, { id, message, defaultMessage, description }) => {
@@ -56,7 +56,9 @@ export class Locize implements Provider {
       const response = await request<string>({
         headers,
         body,
-        url: `${BASE_URL}/missing/${this.projectId}/${this.version}/en/${this.namespace}`,
+        url: `${BASE_URL}/${locale === 'en' ? 'missing' : 'update'}/${this.projectId}/${this.version}/${locale}/${
+          this.namespace
+        }`,
         method: 'POST',
       });
       showInfo(`Response from locize: ${JSON.stringify(response, null, 2)}`);
diff --git a/src/providers/provider.ts b/src/providers/provider.ts
index 899040d..6e908b6 100644
--- a/src/providers/provider.ts
+++ b/src/providers/provider.ts
@@ -3,6 +3,6 @@ import { Message } from '../types';
 export interface Provider {
   getKeys(locales: string[]): Promise<void>;
   getMessage(locale: string, id: string): string;
-  uploadMessages(messages: Message[], locales: string[]): Promise<void>;
+  uploadMessages(messages: Message[], locale: string): Promise<void>;
   getNewMessages(): string[];
 }