diff --git a/.github/workflows/pr-lint.yml b/.github/workflows/pr-lint.yml
index 2f5232b..ddd8d04 100644
--- a/.github/workflows/pr-lint.yml
+++ b/.github/workflows/pr-lint.yml
@@ -6,9 +6,9 @@ on:
 jobs:
   validate:
     name: Validate title
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-large
     steps:
-      - uses: amannn/action-semantic-pull-request@v4
+      - uses: amannn/action-semantic-pull-request@505e44b4f33b4c801f063838b3f053990ee46ea7  # v4
         with:
           types: chore docs fix feat test misc
         env:
diff --git a/.github/workflows/test-and-deploy.yml b/.github/workflows/test-and-deploy.yml
index 09329bf..69358c1 100644
--- a/.github/workflows/test-and-deploy.yml
+++ b/.github/workflows/test-and-deploy.yml
@@ -13,17 +13,17 @@ on:
 jobs:
   test:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-large
     timeout-minutes: 20
     strategy:
       matrix:
         go: [ '1.11', '1.12', '1.13', '1.14', '1.15', '1.16', '1.17' ]
     steps:
       - name: Checkout smtpapi-go
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5  # v2
 
       - name: Setup Go environment
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@bfdd3570ce990073878bf10f6b2d79082de49492  # v2
         with:
           go-version: ${{ matrix.go }}
 
@@ -40,18 +40,18 @@ jobs:
     name: Deploy
     if: success() && github.ref_type == 'tag'
     needs: [ test ]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-large
     steps:
       - name: Checkout smtpapi-go
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5  # v2
 
       - name: Create GitHub Release
-        uses: sendgrid/dx-automator/actions/release@main
+        uses: sendgrid/dx-automator/actions/release@08b601b726671445abc798ed59881766ec8fefc6  # main
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Submit metric to Datadog
-        uses: sendgrid/dx-automator/actions/datadog-release-metric@main
+        uses: sendgrid/dx-automator/actions/datadog-release-metric@08b601b726671445abc798ed59881766ec8fefc6  # main
         env:
           DD_API_KEY: ${{ secrets.DATADOG_API_KEY }}
 
@@ -59,9 +59,9 @@ jobs:
     name: Slack notify on failure
     if: failure() && github.event_name != 'pull_request' && (github.ref == 'refs/heads/main' || github.ref_type == 'tag')
     needs: [ test, deploy ]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-large
     steps:
-      - uses: rtCamp/action-slack-notify@v2
+      - uses: rtCamp/action-slack-notify@33ca3be66c6f378fe1610fd1d5258632dbed5e58  # v2
         env:
           SLACK_COLOR: 'failure'
           SLACK_ICON_EMOJI: ':github:'