diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0b89fed..834d603 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,12 +9,6 @@ jobs:
         include:
           - ruby: 3.3
             os: ubuntu-22.04
-          - ruby: 3.2
-            os: ubuntu-22.04
-          - ruby: 3.1
-            os: ubuntu-20.04
-          - ruby: "3.0"
-            os: ubuntu-20.04
     env:
       LIBTORCH_VERSION: 2.2.1
     steps:
@@ -35,4 +29,5 @@ jobs:
           wget -q -O libtorch.zip https://download.pytorch.org/libtorch/cpu/libtorch-cxx11-abi-shared-with-deps-$LIBTORCH_VERSION%2Bcpu.zip
           unzip -q libtorch.zip
       - run: MAKE="make -j$(nproc)" bundle exec rake compile -- --with-torch-dir=$HOME/libtorch
-      - run: bundle exec rake test
+      - run: sudo apt-get update && sudo apt-get install valgrind
+      - run: bundle exec rake test:valgrind
diff --git a/Gemfile b/Gemfile
index b725171..3251102 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,7 @@ gem "rake"
 gem "rake-compiler"
 gem "minitest", ">= 5"
 gem "numo-narray"
+gem "ruby_memcheck"
 
 # for examples
 gem "torchvision", ">= 0.2", require: false
diff --git a/Rakefile b/Rakefile
index 34f3ff2..3dca72e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,12 +1,18 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 require "rake/extensiontask"
+require "ruby_memcheck"
 
 task default: :test
-Rake::TestTask.new do |t|
+test_config = lambda do |t|
   t.libs << "test"
   t.pattern = "test/**/*_test.rb"
 end
+Rake::TestTask.new(:test, &test_config)
+
+namespace :test do
+  RubyMemcheck::TestTask.new(:valgrind, &test_config)
+end
 
 Rake::ExtensionTask.new("torch") do |ext|
   ext.name = "ext"