diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f38b272..27ec13e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,4 +1,4 @@
-# .github/workflows/ci.yml
+# .github/workflows/main.yml
 
 name: CI
 on:
@@ -12,7 +12,6 @@ on:
 jobs:
   test-ruby-2-4-x:
     runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v2
       - name: Setup Ruby 2.4
@@ -24,17 +23,31 @@ jobs:
         env:
           BUNDLE_GEMFILE: "Gemfile-Ruby-2-4"
         run: |
-          gem install bundler
+          gem install bundler -v 2.3
           bundle install --jobs 4 --retry 3
           bundle exec rake
+
+  test-ruby-2-5-x:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Ruby 2.5
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.5
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler -v 2.3.26
+          bundle install --jobs 4 --retry 3
+          bundle exec rake
+
   test-ruby:
     runs-on: ${{ matrix.os }}-latest
-
     strategy:
       matrix:
         os: [ubuntu]
-        ruby-version: [2.5, 2.6, 2.7, 3.0, 3.1]
-
+        ruby-version: [2.6, 2.7, "3.0", 3.1]
     steps:
       - uses: actions/checkout@v2
       - name: Setup Ruby ${{ matrix.ruby-version }}
@@ -44,6 +57,6 @@ jobs:
           bundler-cache: true
       - name: Build and run tests
         run: |
-          gem install bundler
+          gem install bundler -v 2.4.6
           bundle install --jobs 4 --retry 3
           bundle exec rake
diff --git a/.github/workflows/skunk.yml b/.github/workflows/skunk.yml
index e8a2ffd..839e707 100644
--- a/.github/workflows/skunk.yml
+++ b/.github/workflows/skunk.yml
@@ -6,11 +6,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Setup Ruby
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.6.x
+          ruby-version: 2.6
+          bundler-cache: true
       - name: Run test suite with COVERAGE=true
         run: |
           gem install bundler
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8dddc3..0526208 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## main [(unreleased)](https://github.com/fastruby/skunk/compare/v0.5.2...HEAD)
 
 * <INSERT YOUR FEATURE OR BUGFIX HERE>
+* [BUGFIX: Fix skunk workflow](https://github.com/fastruby/skunk/pull/104)
 * [BUGFIX: Fix documentation and refactor `skunk_score` method](https://github.com/fastruby/skunk/pull/102)
 * [FEATURE: Improve main workflow](https://github.com/fastruby/skunk/pull/99)
 * [BUGFIX: Fix analized module test](https://github.com/fastruby/skunk/pull/98)