diff --git a/README.rdoc b/README.rdoc
index b7f86f1..00746b3 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -85,6 +85,9 @@ Example Code:
 * and ......
 
 == Recent Change
+v1.0.9
+* Fixed a bug: Can't modify frozen String (RuntimeError)
+
 v1.0.8
 * add nkf gem as runtime dependent gem for future Ruby 3.4.
 
diff --git a/lib/writeexcel/version.rb b/lib/writeexcel/version.rb
index f7efab6..d0eac14 100644
--- a/lib/writeexcel/version.rb
+++ b/lib/writeexcel/version.rb
@@ -1,3 +1,3 @@
 module Writeexcel
-  VERSION = "1.0.8"
+  VERSION = "1.0.9"
 end