diff --git a/README.md b/README.md
index 514d3f954..2e70ab37c 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,8 @@ To get mruby, you can download the stable version 3.3.0 from the official mruby
 GitHub repository or clone the trunk of the mruby source tree with the "git
 clone" command. You can also install and compile mruby using [ruby-install](https://github.com/postmodern/ruby-install), [ruby-build](https://github.com/rbenv/ruby-build) or [rvm](https://github.com/rvm/rvm).
 
+The release candidate version 3.4.0 of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/archive/3.4.0-rc.zip](https://github.com/mruby/mruby/archive/3.4.0-rc.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)
 
 The trunk of the mruby source tree can be checked out with the
diff --git a/include/mruby/version.h b/include/mruby/version.h
index 2562603c7..e989e476b 100644
--- a/include/mruby/version.h
+++ b/include/mruby/version.h
@@ -27,7 +27,7 @@ MRB_BEGIN_DECL
 /*
  * The version of Ruby used by mruby.
  */
-#define MRUBY_RUBY_VERSION "3.3"
+#define MRUBY_RUBY_VERSION "3.4"
 
 /*
  * Ruby engine.
@@ -42,7 +42,7 @@ MRB_BEGIN_DECL
 /*
  * Minor release version number.
  */
-#define MRUBY_RELEASE_MINOR 3
+#define MRUBY_RELEASE_MINOR 4
 
 /*
  * Tiny release version number.
@@ -57,7 +57,7 @@ MRB_BEGIN_DECL
 /*
  * Patch level string. (optional)
  */
-#define MRUBY_PATCHLEVEL_STR ""
+#define MRUBY_PATCHLEVEL_STR "RC"
 
 #ifndef MRUBY_PATCHLEVEL_STR
 # if MRUBY_PATCHLEVEL < 0
@@ -80,17 +80,17 @@ MRB_BEGIN_DECL
 /*
  * Release year.
  */
-#define MRUBY_RELEASE_YEAR 2024
+#define MRUBY_RELEASE_YEAR 2025
 
 /*
  * Release month.
  */
-#define MRUBY_RELEASE_MONTH 2
+#define MRUBY_RELEASE_MONTH 3
 
 /*
  * Release day.
  */
-#define MRUBY_RELEASE_DAY 14
+#define MRUBY_RELEASE_DAY 10
 
 /*
  * Release date as a string.