diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
deleted file mode 100644
index 15a74cc24..000000000
--- a/.github/workflows/valgrind.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-name: Valgrind
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    paths:
-      - "ext/**"
-      - "include/**"
-      - "src/**"
-  merge_group: {}
-  workflow_dispatch:
-
-jobs:
-  valgrind:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.4"
-          bundler-cache: none
-      - name: Set working directory as safe
-        run: git config --global --add safe.directory $(pwd)
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y libdb-dev curl autoconf automake m4 libtool python3 valgrind
-      - name: Update rubygems & bundler
-        run: |
-          ruby -v
-          gem update --system
-      - name: bin/setup
-        run: |
-          bin/setup
-      - run: bundle exec rake test:valgrind
-        env:
-          RUBY_FREE_AT_EXIT: 1
-          RBS_SKIP_TESTS: test/rbs_skip_tests_valgrind
diff --git a/Gemfile b/Gemfile
index 96c44c08a..cf2982acd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -38,7 +38,6 @@ group :profilers do
   gem 'stackprof'
   gem 'memory_profiler'
   gem 'benchmark-ips'
-  gem "ruby_memcheck", platform: :ruby
 end
 
 # Test gems
diff --git a/Gemfile.lock b/Gemfile.lock
index bbe2d2e76..d5410b93b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,6 @@ GEM
     logger (1.7.0)
     marcel (1.1.0)
     memory_profiler (1.1.0)
-    mini_portile2 (2.8.9)
     minitest (6.0.1)
       prism (~> 1.5)
     minitest-mock (5.27.0)
@@ -102,9 +101,6 @@ GEM
     net-smtp (0.5.1)
       net-protocol
     nkf (0.2.0)
-    nokogiri (1.19.0)
-      mini_portile2 (~> 2.8.2)
-      racc (~> 1.4)
     ostruct (0.6.3)
     parallel (1.27.0)
     parser (3.3.10.1)
@@ -173,8 +169,6 @@ GEM
       lint_roller (~> 1.1)
       rubocop (~> 1.72, >= 1.72.1)
     ruby-progressbar (1.13.0)
-    ruby_memcheck (3.0.1)
-      nokogiri
     securerandom (0.4.1)
     stackprof (0.2.27)
     stringio (3.2.0)
@@ -231,7 +225,6 @@ DEPENDENCIES
   rubocop
   rubocop-on-rbs
   rubocop-rubycw
-  ruby_memcheck
   stackprof
   steep!
   tempfile
diff --git a/Rakefile b/Rakefile
index 5fee4db17..ebc2abc6e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -35,18 +35,6 @@ end
 
 Rake::TestTask.new(test: :compile, &test_config)
 
-unless Gem.win_platform?
-  begin
-    require "ruby_memcheck"
-
-    namespace :test do
-      RubyMemcheck::TestTask.new(valgrind: :compile, &test_config)
-    end
-  rescue LoadError => exn
-    STDERR.puts "🚨🚨🚨🚨 Skipping RubyMemcheck: #{exn.inspect} 🚨🚨🚨🚨"
-  end
-end
-
 multitask :default => [:test, :stdlib_test, :typecheck_test, :rubocop, :validate, :test_doc]
 
 task :lexer do
diff --git a/test/rbs_skip_tests_valgrind b/test/rbs_skip_tests_valgrind
deleted file mode 100644
index 74622c17f..000000000
--- a/test/rbs_skip_tests_valgrind
+++ /dev/null
@@ -1 +0,0 @@
-RBS::CliTest     Flaky