diff --git a/.github/workflows/pr_tests.yml b/.github/workflows/pr_tests.yml
index f97ce97..87b18cf 100644
--- a/.github/workflows/pr_tests.yml
+++ b/.github/workflows/pr_tests.yml
@@ -36,7 +36,7 @@ jobs:
       - name: "Install Ruby 3.2"
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.5
+          ruby-version: 4.0.6
           bundler-cache: true
       - run: |
           bundle show
diff --git a/.github/workflows/tag_deploy_rubygem.yml b/.github/workflows/tag_deploy_rubygem.yml
index 040751a..c60b8ef 100644
--- a/.github/workflows/tag_deploy_rubygem.yml
+++ b/.github/workflows/tag_deploy_rubygem.yml
@@ -92,7 +92,7 @@ jobs:
           echo "release_command=$GEM_RELEASE_COMMAND" | tee -a "$GITHUB_OUTPUT"
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.5
+          ruby-version: 4.0.6
           bundler-cache: true
       - name: Test build the package
         run: "${{ steps.commands.outputs.build_command }}"
@@ -184,7 +184,7 @@ jobs:
           clean: true
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.5
+          ruby-version: 4.0.6
           bundler-cache: true
       - name: Build RubyGem
         run: |