diff --git a/lib/openai.rb b/lib/openai.rb
index 0aadd7ca..2b3a1e44 100644
--- a/lib/openai.rb
+++ b/lib/openai.rb
@@ -11,7 +11,6 @@
 require "pathname"
 require "rbconfig"
 require "securerandom"
-require "set"
 require "stringio"
 require "time"
 require "uri"