diff --git a/lib/websocket/handshake/handler/client04.rb b/lib/websocket/handshake/handler/client04.rb
index a81132f..a30dc5d 100644
--- a/lib/websocket/handshake/handler/client04.rb
+++ b/lib/websocket/handshake/handler/client04.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'digest/sha1'
-require 'base64'
 
 module WebSocket
   module Handshake
diff --git a/lib/websocket/handshake/handler/server04.rb b/lib/websocket/handshake/handler/server04.rb
index f7c62c6..b0917d4 100644
--- a/lib/websocket/handshake/handler/server04.rb
+++ b/lib/websocket/handshake/handler/server04.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'digest/sha1'
-require 'base64'
 
 module WebSocket
   module Handshake