diff --git a/Doxyfile b/Doxyfile
index ece327c80..d895506a6 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -6,7 +6,7 @@
 
 DOXYFILE_ENCODING      = UTF-8
 PROJECT_NAME           = "mruby"
-PROJECT_NUMBER         = 3.1.0
+PROJECT_NUMBER         = 3.2.0
 
 PROJECT_BRIEF          = "mruby is the lightweight implementation of the Ruby language"
 
diff --git a/doc/guides/debugger.md b/doc/guides/debugger.md
index ef48005af..40afb507b 100644
--- a/doc/guides/debugger.md
+++ b/doc/guides/debugger.md
@@ -38,7 +38,7 @@ To confirm mrdb was installed properly, run mrdb with the `--version` option:
 
 ```bash
 $ mrdb --version
-mruby 3.1.0 (2022-05-12)
+mruby 3.2.0 (2023-02-24)
 ```
 
 ## 2.2 Basic Operation