diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52f66f5..870244b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ## [Unreleased]
+## 5.11.0 / 2026-01-05
 ## Fixed
 * Add 2028 bank holidays
 * support 21st century 4 digit year strings for Daterange
diff --git a/lib/ndr_support/version.rb b/lib/ndr_support/version.rb
index 56be552..ceed1d7 100644
--- a/lib/ndr_support/version.rb
+++ b/lib/ndr_support/version.rb
@@ -3,5 +3,5 @@
 # This defines the NdrSupport version. If you change it, rebuild and commit the gem.
 # Use "rake build" to build the gem, see rake -T for all bundler rake tasks.
 module NdrSupport
-  VERSION = '5.10.5'
+  VERSION = '5.11.0'
 end