diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab03513..c66c71c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 * Add your changelog entry here
 
+### 4.0.3 (2024-07-06)
+
+* Allow use with rack 3.1
+
 ### 4.0.2 (2024-06-13)
 
 * Don't change http header casing by @pcai in https://github.com/savonrb/httpi/pull/249
diff --git a/lib/httpi/version.rb b/lib/httpi/version.rb
index 50f2ce4..339b709 100644
--- a/lib/httpi/version.rb
+++ b/lib/httpi/version.rb
@@ -1,3 +1,3 @@
 module HTTPI
-  VERSION = '4.0.2'
+  VERSION = '4.0.3'
 end