diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 01135a4..c78545e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,6 +26,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{matrix.ruby}}
+          rubygems: latest
           bundler: latest
           bundler-cache: true
       - name: Run tests
diff --git a/tailwindcss-rails.gemspec b/tailwindcss-rails.gemspec
index 672c988..02c10fb 100644
--- a/tailwindcss-rails.gemspec
+++ b/tailwindcss-rails.gemspec
@@ -14,6 +14,8 @@ Gem::Specification.new do |spec|
     "rubygems_mfa_required" => "true"
   }
 
+  spec.required_rubygems_version = ">= 3.2.0" # for Gem::Platform#match_gem?
+
   spec.files = Dir["{app,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
   spec.bindir = "exe"
   spec.executables << "tailwindcss"
diff --git a/test/lib/tailwindcss/commands_test.rb b/test/lib/tailwindcss/commands_test.rb
index d09d8a9..4711222 100644
--- a/test/lib/tailwindcss/commands_test.rb
+++ b/test/lib/tailwindcss/commands_test.rb
@@ -7,12 +7,19 @@ def mock_exe_directory(platform)
       FileUtils.mkdir(File.join(dir, platform))
       path = File.join(dir, platform, "tailwindcss")
       FileUtils.touch(path)
-      Gem::Platform.stub(:match_gem?, true) do
+      stub_gem_platform_match_gem(true) do
         yield(dir, path)
       end
     end
   end
 
+  def stub_gem_platform_match_gem(value)
+    assert_respond_to(Gem::Platform, :match_gem?)
+    Gem::Platform.stub(:match_gem?, value) do
+      yield
+    end
+  end
+
   def mock_local_tailwindcss_install
     Dir.mktmpdir do |dir|
       path = File.join(dir, "tailwindcss")
@@ -35,7 +42,7 @@ def mock_local_tailwindcss_install
   end
 
   test ".executable raises UnsupportedPlatformException when we're not on a supported platform" do
-    Gem::Platform.stub(:match_gem?, false) do # nothing is supported
+    stub_gem_platform_match_gem(false) do # nothing is supported
       assert_raises(Tailwindcss::Commands::UnsupportedPlatformException) do
         Tailwindcss::Commands.executable
       end
@@ -66,7 +73,7 @@ def mock_local_tailwindcss_install
   end
 
   test ".executable returns the executable in TAILWINDCSS_INSTALL_DIR when we're not on a supported platform" do
-    Gem::Platform.stub(:match_gem?, false) do # nothing is supported
+    stub_gem_platform_match_gem(false) do # nothing is supported
       mock_local_tailwindcss_install do |local_install_dir, expected|
         result = nil
         begin