diff --git a/backend/app/controllers/posts_controller.rb b/backend/app/controllers/posts_controller.rb
index 60f3577..feb2340 100644
--- a/backend/app/controllers/posts_controller.rb
+++ b/backend/app/controllers/posts_controller.rb
@@ -19,8 +19,16 @@ class PostsController < ApplicationController
       posts = posts.first(limit)
     end
 
-    render json: { posts:       posts.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } }),
-                   next_cursor: }
+    render json: { posts: posts.map { |post|
+      post.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } }).tap { |json|
+        json['thumbnail'] =
+            if post.thumbnail.attached?
+              rails_storage_proxy_url(post.thumbnail, only_path: false)
+            else
+              nil
+            end
+      }
+    }, next_cursor: }
   end
 
   def random