diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d512e7..d3cb8b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 2.5.0 (unreleased)
+
+- Unicode 15.1
+
 ## 2.4.2
 
 More performance improvements:
diff --git a/README.md b/README.md
index 6e5a523..2e180d0 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 Determines the monospace display width of a string in Ruby. Useful for all kinds of terminal-based applications. Implementation based on [EastAsianWidth.txt](https://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt) and other data, 100% in Ruby. It does not rely on the OS vendor (like [wcwidth()](https://github.com/janlelis/wcswidth-ruby)) to provide an up-to-date method for measuring string width.
 
-Unicode version: **15.0.0** (September 2022)
+Unicode version: **15.1.0** (September 2023)
 
 Supported Rubies: **3.2**,  **3.1**, **3.0**, **2.7**
 
diff --git a/lib/unicode/display_width/constants.rb b/lib/unicode/display_width/constants.rb
index b442e42..cb749f1 100644
--- a/lib/unicode/display_width/constants.rb
+++ b/lib/unicode/display_width/constants.rb
@@ -3,7 +3,7 @@
 module Unicode
   class DisplayWidth
     VERSION = "2.4.2"
-    UNICODE_VERSION = "15.0.0"
+    UNICODE_VERSION = "15.1.0"
     DATA_DIRECTORY = File.expand_path(File.dirname(__FILE__) + "/../../../data/")
     INDEX_FILENAME = DATA_DIRECTORY + "/display_width.marshal.gz"
   end