diff --git a/lib/container.rb b/lib/container.rb
index 004f8653..68e443c4 100644
--- a/lib/container.rb
+++ b/lib/container.rb
@@ -21,14 +21,14 @@ class Container
 
   def copy_files(files)
     url = container_url + "/files"
-    body = files.map{ |filename, content| { filename => content } }
+    body = { files: files.map{ |filename, content| { filename: filename, content: content } } }
     Faraday.post(url, body.to_json, HEADERS)
   end
 
   def copy_submission_files(submission)
     files = {}
     submission.collect_files.each do |file|
-      files[file.name] = file.content
+      files[file.name_with_extension] = file.content
     end
     copy_files(files)
   end
diff --git a/lib/container_connection.rb b/lib/container_connection.rb
index f48c1b28..ec8fb23f 100644
--- a/lib/container_connection.rb
+++ b/lib/container_connection.rb
@@ -4,7 +4,7 @@ class ContainerConnection
   EVENTS = %i[start output exit stdout stderr].freeze
 
   def initialize(url)
-    @socket = Faye::WebSocket::Client.new(url, [], ping: 0.1)
+    @socket = Faye::WebSocket::Client.new(url, [], ping: 5)
 
     %i[open message error close].each do |event_type|
       @socket.on event_type do |event| __send__(:"on_#{event_type}", event) end