diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f792d12..d86d2528 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,25 @@
 # Change log
 
+## 0.10.0 on 2024/11/17
+
+Almost one year has passed since the last release. We have been working on improving the PRK Firmware!
+
+### Breaking Change 💣
+- No breaking change in this release
+
+### New Feature 🎉
+- On startup, if you connect a terminal emulator to com port, you can skip starting the keyboard task by pressing `s` according to the message on the terminal
+  - This feature is useful when your `keymap.rb` breaks and hangs up the keyboard
+  - Note that `s` key should be sent from the other keyboard that is working fine. This means you have to have multiple keyboards⌨⌨⌨⌨
+
+### Improvement 🔈
+- Replace PicoRuby with a totally new one:
+  - The Ruby parser is now Prism!
+  - Many bugs are fixed in the virtual machine and libraries
+  - Stability should be improved a lot🤞
+
+Please report if you find any bugs!
+
 ## 0.9.23 on 2023/11/19
 
 ### require
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 168f1ff0..f4b4093d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.24)
 # initialize the SDK based on PICO_SDK_PATH
 # note: this must happen before project()
 include(pico_sdk_import.cmake)
+include(pico_extras_import.cmake)
 
 #####################################################
 # project specific configuration from here
@@ -48,6 +49,14 @@ project("prk_firmware-${MSC_NAME}-${PRK_VERSION}-${PRK_BUILDDATE}-${PRK_REVISION
 # Initializing the Raspberry Pi Pico SDK should happen after project created
 pico_sdk_init()
 
+add_compile_options(-Wall
+  # int != int32_t as far as the compiler is concerned because gcc has int32_t as long int
+  -Wno-format
+  -Wno-unused-function
+  -Wno-maybe-uninitialized
+  -fshort-enums
+)
+
 file(GLOB SRCS src/*.c)
 add_executable(${PROJECT_NAME}
   ${SRCS}
@@ -58,7 +67,13 @@ add_executable(${PROJECT_NAME}
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-i2c/ports/rp2040/i2c.c
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-spi/ports/rp2040/spi.c
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-adc/ports/rp2040/adc.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-uart/ports/rp2040/uart.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-pwm/ports/rp2040/pwm.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-machine/ports/rp2040/machine.c
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-io-console/ports/rp2040/io-console.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-watchdog/ports/rp2040/watchdog.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-rng/ports/rp2040/rng.c
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-env/ports/rp2040/env.c
 )
 
 set(PICORBC ${CMAKE_SOURCE_DIR}/lib/picoruby/bin/picorbc)
@@ -114,11 +129,11 @@ add_dependencies(${PROJECT_NAME}
 target_include_directories(${PROJECT_NAME} PRIVATE
   ${CMAKE_SOURCE_DIR}/tinyusb
   ${CMAKE_SOURCE_DIR}/lib/picoruby/include/hal_no_impl
-  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-mrubyc/repos/mrubyc/src
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-mrubyc/lib/mrubyc/src
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems/picoruby-filesystem-fat/lib/ff14b/source
   ${CMAKE_SOURCE_DIR}/lib/picoruby/build/$ENV{MRUBY_CONFIG}/mrbgems
-  ${CMAKE_SOURCE_DIR}/lib/picoruby/build/repos/$ENV{MRUBY_CONFIG}/mruby-pico-compiler/include
   ${CMAKE_SOURCE_DIR}/lib/picoruby/mrbgems
+  ${CMAKE_SOURCE_DIR}/lib/picoruby/build/repos/${BUILD_CONFIG}/mruby-compiler2/include
 )
 
 target_link_directories(${PROJECT_NAME} PRIVATE
@@ -131,15 +146,16 @@ target_link_libraries(${PROJECT_NAME}
   tinyusb_device
   tinyusb_board
   hardware_pio
-  hardware_pwm
-  pico_multicore
+  hardware_sleep
   hardware_flash
   hardware_adc
+  hardware_uart
   hardware_dma
   hardware_sync
   hardware_irq
   hardware_i2c
   hardware_spi
+  hardware_pwm
   mruby
 )
 
diff --git a/Gemfile b/Gemfile
index 902191f2..61925919 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,3 @@
 source 'https://rubygems.org'
 
 gem 'rake'
-gem "mrubyc-test", ">= 0.9.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index 1bf1e358..1f271f5d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,30 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (7.0.4.2)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 1.6, < 2)
-      minitest (>= 5.1)
-      tzinfo (~> 2.0)
-    concurrent-ruby (1.2.2)
-    i18n (1.12.0)
-      concurrent-ruby (~> 1.0)
-    minitest (5.18.0)
-    mrubyc-test (0.9.2)
-      activesupport (~> 7.0)
-      rufo (~> 0.12)
-      thor (~> 1.2)
     rake (13.0.6)
-    rufo (0.15.1)
-    thor (1.2.1)
-    tzinfo (2.0.6)
-      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  mrubyc-test (>= 0.9.1)
   rake
 
 BUNDLED WITH
diff --git a/Guardfile b/Guardfile
deleted file mode 100644
index 4f2ceb14..00000000
--- a/Guardfile
+++ /dev/null
@@ -1,4 +0,0 @@
-guard :process, command: %w(bundle exec steep check) do
-  watch %r{lib/picoruby/mrbgems/[^/]+/(mrblib|task|sig)/.+\.(rb|rbs)}
-  watch %r{(mrblib|sig)/.+\.(rb|rbs)}
-end
diff --git a/Rakefile b/Rakefile
index c5c67e58..21fc6ae0 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,30 +1,30 @@
 require "fileutils"
 
 ENV['MRUBY_CONFIG'] = "prk_firmware-cortex-m0plus"
-PICO_SDK_TAG = "1.5.1"
+PICO_SDK_TAG = "2.0.0"
 
 task :default => :production
 
 task :setup do
   sh "bundle install"
-  sh "git submodule update --init"
+  sh "git submodule update --init --recursive"
   FileUtils.cd "lib/picoruby" do
     sh "bundle install"
   end
 end
 
-task :all => [:libmruby, :test, :cmake, :build]
-
+task :all => [:libmruby, :cmake, :build]
 
 desc "build debug (you may need to rake clean before this)"
 task :debug do
   ENV['PICORUBY_DEBUG'] = '1'
-  ENV['-DCMAKE_BUILD_TYPE'] = 'Debug'
+  ENV['CMAKE_BUILD_TYPE'] = 'Debug'
   Rake::Task[:all].invoke
 end
 
 desc "build production"
 task :production do
+  ENV['CMAKE_BUILD_TYPE'] = 'Release'
   Rake::Task[:all].invoke
 end
 
@@ -55,12 +55,12 @@ end
 task :libmruby => "lib/picoruby" do
   FileUtils.cd "lib/picoruby" do
     sh "MRUBY_CONFIG=default rake test"
-    sh "MRUBY_CONFIG=#{ENV['MRUBY_CONFIG']} rake"
+    sh "rake"
   end
 end
 
 task :cmake do
-  sh "cmake -B #{ENV['PRK_BUILD_DIR']}build"
+  sh "cmake -DCMAKE_BUILD_TYPE=#{ENV['CMAKE_BUILD_TYPE']} -B #{ENV['PRK_BUILD_DIR']}build"
 end
 
 task :check_pico_sdk => :check_pico_sdk_path do
@@ -96,28 +96,6 @@ task :clean_with_keymap , ['keyboard_name'] do |_t, args|
   FileUtils.rm_r Dir.glob("keyboards/#{args.keyboard_name}/build/*")
 end
 
-
-desc "run :mrubyc_test"
-task :test => %i(mrubyc_test)
-
-desc "run unit test for ruby program"
-task :mrubyc_test => :setup_test do
-  sh %q(MRUBYCFILE=test/Mrubycfile bundle exec mrubyc-test)
-end
-
-task :setup_test do
-  FileUtils.cd "test/models" do
-    Dir.glob("../../lib/picoruby/mrbgems/picoruby-prk-*").each do |dir|
-      Dir.glob("#{dir}/mrblib/*.rb").each do |model|
-        FileUtils.ln_sf model, File.basename(model)
-      end
-    end
-    FileUtils.ln_sf "../../lib/picoruby/mrbgems/picoruby-gpio/mrblib/gpio.rb", "gpio.rb"
-    FileUtils.ln_sf "../../lib/picoruby/mrbgems/picoruby-float-ext/mrblib/float.rb", "float.rb"
-    FileUtils.ln_sf "../../lib/picoruby/mrbgems/picoruby-music-macro-language/mrblib/mml.rb", "mml.rb"
-  end
-end
-
 desc "clean built"
 task :clean do
   FileUtils.cd "lib/picoruby" do
@@ -150,13 +128,8 @@ task :symlinks do
   end
 end
 
-desc "run guard-process"
-task :guard do
-  sh "bundle exec guard start -i"
-end
-
 # Add a new tag then push it
-task :release => :test do
+task :release do
   git_status = `git status`
   branch = git_status.split("\n")[0].match(/\AOn branch (.+)\z/)[1]
   if branch != "master"
diff --git a/lib/picoruby b/lib/picoruby
index a5ffc54f..4c6a147c 160000
--- a/lib/picoruby
+++ b/lib/picoruby
@@ -1 +1 @@
-Subproject commit a5ffc54f57a67f3e006c86ef08ce4eb53dac4584
+Subproject commit 4c6a147c07599c807e1b0a6ade00517a5a63ae59
diff --git a/mrblib/object-ext.rb b/mrblib/object-ext.rb
index 1e147ea2..b7de3dc5 100644
--- a/mrblib/object-ext.rb
+++ b/mrblib/object-ext.rb
@@ -1,7 +1,3 @@
-class LoadError < StandardError
-  # ScriptError is the super class in CRuby
-end
-
 class Object
 
   alias _puts puts
diff --git a/mrblib/usb_task.rb b/mrblib/usb_task.rb
index 9914ea3b..4c0fbaab 100644
--- a/mrblib/usb_task.rb
+++ b/mrblib/usb_task.rb
@@ -1,10 +1,20 @@
+require "machine"
+require "watchdog"
+Watchdog.disable
+require 'env'
+
+ENV["HOME"] = "/"
+ENV["PWD"] = "/"
+
+STDOUT = IO
+STDIN = IO
+STDIN.echo = false
+
 if PICORUBY_MSC == "MSC_SD"
   require "spi"
 end
 require "keyboard"
 
-ENV = {}
-
 200.times do
   USB.tud_task
   sleep_ms 2
@@ -17,6 +27,11 @@
 while true
   USB.tud_task
   if Keyboard.autoreload_ready? && File.exist?("/keymap.rb")
-    Keyboard.restart
+    break unless Keyboard.restart
   end
 end
+
+puts "Restart microcontroller when you want to reload keymap.rb"
+while true
+  USB.tud_task
+end
diff --git a/pico_extras_import.cmake b/pico_extras_import.cmake
new file mode 100644
index 00000000..706add02
--- /dev/null
+++ b/pico_extras_import.cmake
@@ -0,0 +1,62 @@
+# This is a copy of <PICO_EXTRAS_PATH>/external/pico_extras_import.cmake
+
+# This can be dropped into an external project to help locate pico-extras
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_EXTRAS_PATH} AND (NOT PICO_EXTRAS_PATH))
+    set(PICO_EXTRAS_PATH $ENV{PICO_EXTRAS_PATH})
+    message("Using PICO_EXTRAS_PATH from environment ('${PICO_EXTRAS_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_EXTRAS_FETCH_FROM_GIT} AND (NOT PICO_EXTRAS_FETCH_FROM_GIT))
+    set(PICO_EXTRAS_FETCH_FROM_GIT $ENV{PICO_EXTRAS_FETCH_FROM_GIT})
+    message("Using PICO_EXTRAS_FETCH_FROM_GIT from environment ('${PICO_EXTRAS_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_EXTRAS_FETCH_FROM_GIT_PATH} AND (NOT PICO_EXTRAS_FETCH_FROM_GIT_PATH))
+    set(PICO_EXTRAS_FETCH_FROM_GIT_PATH $ENV{PICO_EXTRAS_FETCH_FROM_GIT_PATH})
+    message("Using PICO_EXTRAS_FETCH_FROM_GIT_PATH from environment ('${PICO_EXTRAS_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+if (NOT PICO_EXTRAS_PATH)
+    if (PICO_EXTRAS_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_EXTRAS_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_EXTRAS_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        FetchContent_Declare(
+                PICO_EXTRAS
+                GIT_REPOSITORY https://github.com/raspberrypi/pico-extras
+                GIT_TAG master
+        )
+        if (NOT PICO_EXTRAS)
+            message("Downloading PICO EXTRAS")
+            FetchContent_Populate(PICO_EXTRAS)
+            set(PICO_EXTRAS_PATH ${PICO_EXTRAS_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        if (PICO_SDK_PATH AND EXISTS "${PICO_SDK_PATH}/../pico-extras")
+            set(PICO_EXTRAS_PATH ${PICO_SDK_PATH}/../pico-extras)
+            message("Defaulting PICO_EXTRAS_PATH as sibling of PICO_SDK_PATH: ${PICO_EXTRAS_PATH}")
+        else()
+            message(FATAL_ERROR
+                    "PICO EXTRAS location was not specified. Please set PICO_EXTRAS_PATH or set PICO_EXTRAS_FETCH_FROM_GIT to on to fetch from git."
+                    )
+        endif()
+    endif ()
+endif ()
+
+set(PICO_EXTRAS_PATH "${PICO_EXTRAS_PATH}" CACHE PATH "Path to the PICO EXTRAS")
+set(PICO_EXTRAS_FETCH_FROM_GIT "${PICO_EXTRAS_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of PICO EXTRAS from git if not otherwise locatable")
+set(PICO_EXTRAS_FETCH_FROM_GIT_PATH "${PICO_EXTRAS_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download EXTRAS")
+
+get_filename_component(PICO_EXTRAS_PATH "${PICO_EXTRAS_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_EXTRAS_PATH})
+    message(FATAL_ERROR "Directory '${PICO_EXTRAS_PATH}' not found")
+endif ()
+
+set(PICO_EXTRAS_PATH ${PICO_EXTRAS_PATH} CACHE PATH "Path to the PICO EXTRAS" FORCE)
+
+add_subdirectory(${PICO_EXTRAS_PATH} pico_extras)
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 21030b3b..1944377d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,4 @@
 /* PicoRuby */
-#include <picorbc.h>
 #include <picogem_init.c>
 
 /* Raspi SDK */
@@ -32,16 +31,13 @@
 #endif
 
 #if defined(PICORUBY_SQLITE3)
-  #define MEMORY_SIZE (1024*203)
+  #define MEMORY_SIZE (1024*190)
 #else
-  #define MEMORY_SIZE (1024*207)
+  #define MEMORY_SIZE (1024*200)
 #endif
 
 static uint8_t memory_pool[MEMORY_SIZE];
 
-/* extern in mruby-pico-compiler/include/debug.h */
-int loglevel = LOGLEVEL_WARN;
-
 int autoreload_state; /* from keyboard.h */
 
 #ifndef PICORUBY_NO_MSC
@@ -83,9 +79,8 @@ prk_init_picoruby(void)
   mrbc_raw_free(vm);
   /* class Object */
   picoruby_load_model(object_ext);
-  picoruby_init_require();
+  picoruby_init_require(vm);
   prk_init_Machine();
-  prk_init_PicoRubyVM();
   prk_init_USB();
 }
 
diff --git a/src/picorubyvm.c b/src/picorubyvm.c
deleted file mode 100644
index 686d0c23..00000000
--- a/src/picorubyvm.c
+++ /dev/null
@@ -1,37 +0,0 @@
-#include <mrubyc.h>
-
-#include "../include/picorubyvm.h"
-
-static void
-c_print_alloc_stats(mrbc_vm *vm, mrbc_value *v, int argc)
-{
-  struct MRBC_ALLOC_STATISTICS mem;
-  mrbc_alloc_statistics(&mem);
-  console_printf("\nSTATS %d/%d\n", mem.used, mem.total);
-  SET_NIL_RETURN();
-}
-
-static void
-c_alloc_stats(mrbc_vm *vm, mrbc_value *v, int argc)
-{
-  struct MRBC_ALLOC_STATISTICS mem;
-  mrbc_value ret = mrbc_hash_new(vm, 4);
-  mrbc_alloc_statistics(&mem);
-  mrbc_hash_set(&ret, &mrbc_symbol_value(mrbc_str_to_symid("TOTAL")),
-                &mrbc_integer_value(mem.total));
-  mrbc_hash_set(&ret, &mrbc_symbol_value(mrbc_str_to_symid("USED")),
-                &mrbc_integer_value(mem.used));
-  mrbc_hash_set(&ret, &mrbc_symbol_value(mrbc_str_to_symid("FREE")),
-                &mrbc_integer_value(mem.free));
-  mrbc_hash_set(&ret, &mrbc_symbol_value(mrbc_str_to_symid("FRAGMENTATION")),
-                &mrbc_integer_value(mem.fragmentation));
-  SET_RETURN(ret);
-}
-
-void
-prk_init_PicoRubyVM()
-{
-  mrbc_class *mrbc_class_PicoRubyVM = mrbc_define_class(0, "PicoRubyVM", mrbc_class_object);
-  mrbc_define_method(0, mrbc_class_PicoRubyVM, "alloc_stats", c_alloc_stats);
-  mrbc_define_method(0, mrbc_class_PicoRubyVM, "print_alloc_stats", c_print_alloc_stats);
-}
diff --git a/src/usb_cdc.c b/src/usb_cdc.c
index cef2e2a7..158e99a5 100644
--- a/src/usb_cdc.c
+++ b/src/usb_cdc.c
@@ -28,9 +28,4 @@ void
 tud_cdc_rx_cb(uint8_t itf)
 {
   (void) itf;
-
-  char buf[64];
-  uint32_t count = tud_cdc_read(buf, sizeof(buf));
-  tud_cdc_write(buf, count);
-  tud_cdc_write_flush();
 }
diff --git a/src/usb_descriptors.c b/src/usb_descriptors.c
index 3fbf3688..c6af20af 100644
--- a/src/usb_descriptors.c
+++ b/src/usb_descriptors.c
@@ -453,7 +453,6 @@ c_tud_task(mrbc_vm *vm, mrbc_value *v, int argc)
 static bool
 report_raw_hid(uint8_t* data, uint8_t len)
 {
-  bool ret;
   // Remote wakeup
   if (tud_suspended()) {
     // Wake up host if we are in suspend mode
@@ -532,7 +531,7 @@ static void
 c_save_prk_conf(mrbc_vm *vm, mrbc_value *v, int argc)
 {
   uint8_t buff[SECTOR_SIZE] = {0};
-  memcpy(buff, (const uint8_t *)GET_STRING_ARG(1), strlen((const uint8_t *)GET_STRING_ARG(1)));
+  memcpy(buff, (const uint8_t *)GET_STRING_ARG(1), strlen((const char *)GET_STRING_ARG(1)));
   if (strncmp((const char *)buff,
               (const char *)(FLASH_MMAP_ADDR - SECTOR_SIZE),
               PRK_CONF_SIZE) == 0)