diff --git a/lib/syntax_tree.rb b/lib/syntax_tree.rb
index 4e183383..24d8426f 100644
--- a/lib/syntax_tree.rb
+++ b/lib/syntax_tree.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "prettier_print"
+require "pp"
 require "ripper"
 
 require_relative "syntax_tree/node"