diff --git a/Doxyfile b/Doxyfile
index cb0bf5546..0dd49db43 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -6,7 +6,7 @@
 
 DOXYFILE_ENCODING      = UTF-8
 PROJECT_NAME           = "mruby"
-PROJECT_NUMBER         = 3.0.0
+PROJECT_NUMBER         = 3.1.0
 
 PROJECT_BRIEF          = "mruby is the lightweight implementation of the Ruby language"
 
diff --git a/README.md b/README.md
index 5e82f727f..271551df5 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ of the Ministry of Economy, Trade and Industry of Japan.
 
 ## How to get mruby
 
-The release candidate version 3.1.0 of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/archive/3.1.0-rc2.zip](https://github.com/mruby/mruby/archive/3.1.0-rc2.zip)
+The stable version 3.1.0 of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/archive/3.1.0.zip](https://github.com/mruby/mruby/archive/3.1.0.zip)
 
 The latest development version of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/zipball/master](https://github.com/mruby/mruby/zipball/master)
 
diff --git a/doc/guides/debugger.md b/doc/guides/debugger.md
index 14c9bfebd..18673c47b 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 3.0.0 (2021-03-05)
+mruby 3.1.0 (2022-05-12)
 ```
 
 ## 2.2 Basic Operation
diff --git a/doc/limitations.md b/doc/limitations.md
index b0caecc8f..3364e7042 100644
--- a/doc/limitations.md
+++ b/doc/limitations.md
@@ -30,7 +30,7 @@ end
 
 `ZeroDivisionError` is raised.
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 `RuntimeError` is raised instead of `ZeroDivisionError`. To re-raise the exception, you have to do:
 
@@ -66,7 +66,7 @@ p Liste.new "foobar"
 
 ` [] `
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 `ArgumentError` is raised.
 
@@ -96,7 +96,7 @@ false
 true
 ```
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 ```
 true
@@ -133,7 +133,7 @@ p 'ok'
 ok
 ```
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 ```
 test.rb:8: undefined method 'test_func' (NoMethodError)
@@ -155,7 +155,7 @@ defined?(Foo)
 nil
 ```
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 `NameError` is raised.
 
@@ -172,7 +172,7 @@ alias $a $__a__
 
 ` nil `
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 Syntax error
 
@@ -194,7 +194,7 @@ end
 `ArgumentError` is raised.
 The re-defined `+` operator does not accept any arguments.
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 ` 'ab' `
 Behavior of the operator wasn't changed.
@@ -210,7 +210,7 @@ $ ruby -e 'puts Proc.new {}.binding'
 #<Binding:0x00000e9deabb9950>
 ```
 
-#### mruby [3.0.0 (2021-03-05)]
+#### mruby [3.1.0 (2022-05-12)]
 
 ```
 $ ./bin/mruby -e 'puts Proc.new {}.binding'
diff --git a/include/mruby/version.h b/include/mruby/version.h
index a13f094e2..cf713da2b 100644
--- a/include/mruby/version.h
+++ b/include/mruby/version.h
@@ -57,7 +57,7 @@ MRB_BEGIN_DECL
 /*
  * Patch level string. (optional)
  */
-#define MRUBY_PATCHLEVEL_STR "RC2"
+#define MRUBY_PATCHLEVEL_STR ""
 
 #ifndef MRUBY_PATCHLEVEL_STR
 # if MRUBY_PATCHLEVEL < 0
@@ -85,12 +85,12 @@ MRB_BEGIN_DECL
 /*
  * Release month.
  */
-#define MRUBY_RELEASE_MONTH 3
+#define MRUBY_RELEASE_MONTH 5
 
 /*
  * Release day.
  */
-#define MRUBY_RELEASE_DAY 31
+#define MRUBY_RELEASE_DAY 12
 
 /*
  * Release date as a string.