diff --git a/.github/workflows/spec.yml b/.github/workflows/spec.yml
index 434dbbbc..83f1aca4 100644
--- a/.github/workflows/spec.yml
+++ b/.github/workflows/spec.yml
@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: 2.6.6
           bundler-cache: true
       - run: bundle exec rubocop
       - run: bundle exec haml-lint app/views
@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6
+          ruby-version: 2.6.6
           bundler-cache: true
       - name: Prepare spec
         run: |