diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f2c9bc7..6bf7ed8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,9 @@ on:
 jobs:
   test:
     name: tests / ruby
-    runs-on: ubuntu-latest
+    runs-on:
+      group: SelfHostedDefault
+      labels: ubuntu-22.04-micro
     strategy:
       matrix:
         ruby-version: ['2.7.8', '3.0.7']
@@ -22,7 +24,9 @@ jobs:
         run: bundle exec rspec
   rubocop:
     name: linters / rubocop
-    runs-on: ubuntu-latest
+    runs-on:
+      group: SelfHostedDefault
+      labels: ubuntu-22.04-micro
     env:
       RUBY_VERSION: 2.7.8
       RUBOCOP_VERSION: 1.41.1
@@ -38,7 +42,7 @@ jobs:
           cache-version: 1
 
       - name: rubocop
-        uses: reviewdog/action-rubocop@v2.3.0
+        uses: reviewdog/action-rubocop@fcb74ba274da10b18d038d0bcddaae3518739634
         with:
           rubocop_version: ${{ env.RUBOCOP_VERSION }}
           rubocop_extensions: rubocop-performance rubocop-rake rubocop-i18n