diff --git a/examples/08_gui_snapshot.rb b/examples/08_gui_snapshot.rb
index 29402d5..d582b0f 100755
--- a/examples/08_gui_snapshot.rb
+++ b/examples/08_gui_snapshot.rb
@@ -28,7 +28,7 @@ WINDOW_HEIGHT = 500
 
 class Gui < Gosu::Window
   def initialize
-    super WINDOW_WIDTH, WINDOW_HEIGHT
+    super(WINDOW_WIDTH, WINDOW_HEIGHT)
     self.caption = 'ruby teeworlds client'
     @client = TeeworldsClient.new
     @client.connect('localhost', 8303, detach: true)
diff --git a/lib/game_server.rb b/lib/game_server.rb
index ab31bcd..7cb441f 100644
--- a/lib/game_server.rb
+++ b/lib/game_server.rb
@@ -149,7 +149,7 @@ class GameServer
     return if call_hook(:shutdown, Context.new(nil)).nil?
 
     puts '[gameserver] disconnecting all clients ...'
-    @server.clients.each do |id, client|
+    @server.clients.each do |_id, client|
       @server.send_ctrl_close(client, @server.shutdown_reason)
     end
     puts '[gameserver] shutting down ...'
diff --git a/lib/net_base.rb b/lib/net_base.rb
index a9d00e2..d7fc0ca 100644
--- a/lib/net_base.rb
+++ b/lib/net_base.rb
@@ -105,6 +105,6 @@ class NetBase
     end
     @s.send(data, 0, ip, port)
 
-    puts Packet.new(data, '>').to_s if @verbose || opts[:test]
+    puts Packet.new(data, '>') if @verbose || opts[:test]
   end
 end
diff --git a/lib/packet.rb b/lib/packet.rb
index 4f97b3e..b3e0931 100644
--- a/lib/packet.rb
+++ b/lib/packet.rb
@@ -27,7 +27,7 @@ class Packet
     flags_byte = @data[0].unpack('B*')
     @flags = PacketFlags.new(flags_byte.first[2..5]).hash
     @payload = @data[PACKET_HEADER_SIZE..]
-    return unless  flags_compressed
+    return unless flags_compressed
 
     @payload = @huffman.decompress(@payload.unpack('C*'))
     @payload = @payload.pack('C*')
diff --git a/lib/teeworlds_client.rb b/lib/teeworlds_client.rb
index 5bf4b58..2791531 100644
--- a/lib/teeworlds_client.rb
+++ b/lib/teeworlds_client.rb
@@ -440,7 +440,7 @@ class TeeworldsClient
     data = packet.payload
     if data.size.zero?
       puts 'Error: packet payload is empty'
-      puts packet.to_s
+      puts packet
       return
     end
     chunks = BigChungusTheChunkGetter.get_chunks(data)
@@ -480,7 +480,7 @@ class TeeworldsClient
     data = pck.first
 
     packet = Packet.new(data, '<')
-    puts packet.to_s if @verbose
+    puts packet if @verbose
 
     # process connless packets data
     if packet.flags_control
diff --git a/lib/teeworlds_server.rb b/lib/teeworlds_server.rb
index 1bed3ff..93e3df3 100644
--- a/lib/teeworlds_server.rb
+++ b/lib/teeworlds_server.rb
@@ -15,8 +15,7 @@ require_relative 'game_server'
 require_relative 'models/token'
 
 class Client
-  attr_accessor :id, :addr, :vital_sent, :last_recv_time, :token, :player, :in_game
-  attr_accessor :authed
+  attr_accessor :id, :addr, :vital_sent, :last_recv_time, :token, :player, :in_game, :authed
   attr_reader :ack
 
   def initialize(attr = {})
@@ -423,7 +422,7 @@ class TeeworldsServer
       packet.client = client
     end
 
-    puts packet.to_s if @verbose
+    puts packet if @verbose
     on_packet(packet)
   end
 end