diff --git a/.github/workflows/push_gem.yml b/.github/workflows/push_gem.yml
index d6041a0..914b433 100644
--- a/.github/workflows/push_gem.yml
+++ b/.github/workflows/push_gem.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
+        uses: step-security/harden-runner@b09bb98e06d4d774595224525879c09bc6e98c40 # v2.20.1
         with:
           egress-policy: audit
 
diff --git a/Gemfile b/Gemfile
index 65b9529..a8fdfc7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 gemspec
 
 gem "bundler"
+gem "fiddle" if RUBY_VERSION.start_with?("4")
 gem "test-unit"
 gem "test-unit-ruby-core"
 gem "rake"