diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 560e31e..d2fbe59 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,6 +18,8 @@ jobs:
           - '3.4.5'
         wasm_tools:
           - '1.236.0'
+        wabt:
+          - '1.0.37'
 
     steps:
     - uses: actions/checkout@v4
@@ -28,7 +30,7 @@ jobs:
         bundler-cache: true
     - name: Install wasm-tools
       run: |
-        mkdir .bin
+        mkdir -p .bin
         curl -L https://github.com/bytecodealliance/wasm-tools/releases/download/v${{ matrix.wasm_tools }}/wasm-tools-${{ matrix.wasm_tools }}-x86_64-linux.tar.gz -o wasm-tools.tar.gz
         tar xvzf wasm-tools.tar.gz
         mv wasm-tools-*-x86_64-linux/wasm-tools .bin/wasm-tools
@@ -37,6 +39,17 @@ jobs:
       run: |
         export PATH=`pwd`/.bin:$PATH
         wasm-tools --version
+    - name: Install wast2json
+      run: |
+        mkdir -p .bin
+        curl -L https://github.com/WebAssembly/wabt/releases/download/${{ matrix.wabt }}/wabt-${{ matrix.wabt }}-ubuntu-20.04.tar.gz -o wabt.tar.gz
+        tar xvzf wabt.tar.gz
+        mv wabt-*/bin/wast2json .bin/wast2json
+        chmod a+x .bin/wast2json
+    - name: Version wast2json
+      run: |
+        export PATH=`pwd`/.bin:$PATH
+        wast2json --version
     - name: Run the check task
       run: |
         export PATH=`pwd`/.bin:$PATH
@@ -45,3 +58,7 @@ jobs:
       run: |
         export PATH=`pwd`/.bin:$PATH
         bundle exec rake test
+    - name: Run the official spec
+      run: |
+        export PATH=`pwd`/.bin:$PATH
+        bundle exec rake 'spec[i32]'
diff --git a/.gitignore b/.gitignore
index 04bac06..908ce24 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@
 .ruby-version
 .gem_rbs_collection
 ruby-wasm32-wasi
+spec/skip.txt
diff --git a/Rakefile b/Rakefile
index 39e5fd7..cc9f4b4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -22,6 +22,23 @@ task :wasm, [:name] do |t, args|
   end
 end
 
+desc "Run the official spec"
+task :spec, [:name] do |t, args|
+  sh "which git && git clean -f spec/ || true"
+
+  Dir.chdir "spec" do
+    sh "curl -L -o ./#{args.name}.wast https://raw.githubusercontent.com/WebAssembly/spec/refs/tags/wg-1.0/test/core/#{args.name}.wast"
+    sh "wast2json ./#{args.name}.wast"
+    sh "env JSON_PATH=./#{args.name}.json ruby ./runner.rb -v"
+
+    if File.exist?("./skip.txt")
+      puts
+      puts "\e[1;36mSkipped tests:\e[0m"
+      puts IO.read("./skip.txt")
+    end
+  end
+end
+
 desc "Generate codes"
 task :generate do
   require_relative "scripts/gen_alu"
diff --git a/spec/runner.rb b/spec/runner.rb
index bc8f230..265c27d 100644
--- a/spec/runner.rb
+++ b/spec/runner.rb
@@ -2,7 +2,8 @@
 require "wardite"
 require "test-unit"
 
-testcase = JSON.load_file("spec/i32.json", symbolize_names: true)
+json_path = ENV['JSON_PATH'] || File.expand_path("../i32.json", __FILE__)
+testcase = JSON.load_file(json_path, symbolize_names: true)
 
 $commands = testcase[:commands]
 
@@ -28,6 +29,10 @@ def parse_result(arg)
   end
 end
 
+BEGIN {
+  File.delete(File.expand_path("../skip.txt", __FILE__)) if File.exist?(File.expand_path("../skip.txt", __FILE__))
+}
+
 class WarditeI32Test < Test::Unit::TestCase
   extend Wardite::ValueHelper
   current_wasm = nil
@@ -52,7 +57,7 @@ class WarditeI32Test < Test::Unit::TestCase
       expected_ = expected.map{|v| parse_result(v)}
   
       test "#{command_type}: (#{"%4d" % line}) #{field}(#{args_.inspect}) -> #{expected_.inspect}" do
-        instance = instance = Wardite::new(path: "spec/" + current_wasm)
+        instance = instance = Wardite::new(path: File.expand_path("../#{current_wasm}", __FILE__))
         ret = instance.runtime.call(field, args_)
 
         assert { ret == expected_[0] }
@@ -72,7 +77,7 @@ class WarditeI32Test < Test::Unit::TestCase
       expected_ = expected.map{|v| parse_result(v)}
   
       test "#{command_type}: (#{"%4d" % line}) #{field}(#{args_.inspect})" do
-        instance = instance = Wardite::new(path: "spec/" + current_wasm)
+        instance = instance = Wardite::new(path: File.expand_path("../#{current_wasm}", __FILE__))
         command => {text:}
         trapped = false
         begin
@@ -87,8 +92,12 @@ class WarditeI32Test < Test::Unit::TestCase
         end
       end
     when "assert_invalid", "assert_malformed"
-      test "#{command_type}: #{command.inspect}" do
-        omit "skip #{command_type}"
+      if ENV['VERBOSE']
+        test "#{command_type}: #{command.inspect}" do
+          omit "skip #{command_type}"
+        end
+      else
+        IO.write(File.expand_path("../skip.txt", __FILE__), "#{command_type}: #{command.inspect}\n", mode: "a")
       end
     end
   end