diff --git a/lib/puma/const.rb b/lib/puma/const.rb
index 465555ce..504b3312 100644
--- a/lib/puma/const.rb
+++ b/lib/puma/const.rb
@@ -100,7 +100,7 @@ module Puma
   # too taxing on performance.
   module Const
 
-    PUMA_VERSION = VERSION = "4.3.0".freeze
+    PUMA_VERSION = VERSION = "4.3.1".freeze
     CODE_NAME = "Mysterious Traveller".freeze
     PUMA_SERVER_STRING = ['puma', PUMA_VERSION, CODE_NAME].join(' ').freeze