diff --git a/.github/actions/test_gem/action.yml b/.github/actions/test_gem/action.yml
index 38b77c760..aa6486e36 100644
--- a/.github/actions/test_gem/action.yml
+++ b/.github/actions/test_gem/action.yml
@@ -58,21 +58,21 @@ runs:
     # ...but not for appraisals, sadly.
     - name: Install Ruby ${{ inputs.ruby }} with dependencies
       if: "${{ steps.setup.outputs.appraisals == 'false' }}"
-      uses: ruby/setup-ruby@v1.176.0
+      uses: ruby/setup-ruby@v1.179.0
       with:
         ruby-version: "${{ inputs.ruby }}"
         working-directory: "${{ steps.setup.outputs.gem_dir }}"
-        bundler:  "latest"
+        bundler:  "2.5.10"
         bundler-cache: true
         cache-version: "v1-${{ steps.setup.outputs.cache_key }}"
 
     # If we're using appraisals, do it all manually.
     - name: Install Ruby ${{ inputs.ruby }} without dependencies
       if: "${{ steps.setup.outputs.appraisals == 'true' }}"
-      uses: ruby/setup-ruby@v1.176.0
+      uses: ruby/setup-ruby@v1.179.0
       with:
         ruby-version: "${{ inputs.ruby }}"
-        bundler:  "latest"
+        bundler:  "2.5.10"
         working-directory: "${{ steps.setup.outputs.gem_dir }}"
     - name: Install dependencies and generate appraisals
       if: "${{ steps.setup.outputs.appraisals == 'true' }}"
diff --git a/.github/workflows/release-hook-on-closed.yml b/.github/workflows/release-hook-on-closed.yml
index e6c98e7b0..8e15e2124 100644
--- a/.github/workflows/release-hook-on-closed.yml
+++ b/.github/workflows/release-hook-on-closed.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Ruby ${{ env.ruby_version }}
-        uses: ruby/setup-ruby@v1.176.0
+        uses: ruby/setup-ruby@v1.179.0
         with:
           ruby-version: ${{ env.ruby_version }}
       - name: Checkout repo
diff --git a/.github/workflows/release-hook-on-push.yml b/.github/workflows/release-hook-on-push.yml
index 96b780d26..00cf10864 100644
--- a/.github/workflows/release-hook-on-push.yml
+++ b/.github/workflows/release-hook-on-push.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Ruby ${{ env.ruby_version }}
-        uses: ruby/setup-ruby@v1.176.0
+        uses: ruby/setup-ruby@v1.179.0
         with:
           ruby-version: ${{ env.ruby_version }}
       - name: Checkout repo
diff --git a/.github/workflows/release-perform.yml b/.github/workflows/release-perform.yml
index 36e49facf..49aa21658 100644
--- a/.github/workflows/release-perform.yml
+++ b/.github/workflows/release-perform.yml
@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Ruby ${{ env.ruby_version }}
-        uses: ruby/setup-ruby@v1.176.0
+        uses: ruby/setup-ruby@v1.179.0
         with:
           ruby-version: ${{ env.ruby_version }}
       - name: Checkout repo
diff --git a/.github/workflows/release-request.yml b/.github/workflows/release-request.yml
index 69584c952..cd10d07fb 100644
--- a/.github/workflows/release-request.yml
+++ b/.github/workflows/release-request.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Ruby ${{ env.ruby_version }}
-        uses: ruby/setup-ruby@v1.176.0
+        uses: ruby/setup-ruby@v1.179.0
         with:
           ruby-version: ${{ env.ruby_version }}
       - name: Checkout repo
diff --git a/.github/workflows/release-retry.yml b/.github/workflows/release-retry.yml
index cb02dfb0d..dc2f94069 100644
--- a/.github/workflows/release-retry.yml
+++ b/.github/workflows/release-retry.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Ruby ${{ env.ruby_version }}
-        uses: ruby/setup-ruby@v1.176.0
+        uses: ruby/setup-ruby@v1.179.0
         with:
           ruby-version: ${{ env.ruby_version }}
       - name: Checkout repo