diff --git a/lib/mongo/version.rb b/lib/mongo/version.rb
index a78e0fa94b..f0a43b1583 100644
--- a/lib/mongo/version.rb
+++ b/lib/mongo/version.rb
@@ -16,5 +16,5 @@
 
 module Mongo
   # The current version of the driver.
-  VERSION = '2.21.0'
+  VERSION = '2.21.1'
 end