diff --git a/.github/workflows/add-card.yml b/.github/workflows/add-card.yml
index 5bd682b22f..4584c46631 100644
--- a/.github/workflows/add-card.yml
+++ b/.github/workflows/add-card.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Create Project Card
-        uses: peter-evans/create-or-update-project-card@v2
+        uses: peter-evans/create-or-update-project-card@5eacbbd224b7814354861b555cc18a8359e2cebe # v2.0.1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           project-location: pantheon-systems/documentation
diff --git a/.github/workflows/auto-add-issues.yml b/.github/workflows/auto-add-issues.yml
index d8f5160a83..f1f57a4f81 100644
--- a/.github/workflows/auto-add-issues.yml
+++ b/.github/workflows/auto-add-issues.yml
@@ -5,7 +5,7 @@ jobs:
     name: Add issue to project
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/add-to-project@v1.0.1
+      - uses: actions/add-to-project@9bfe908f2eaa7ba10340b31e314148fcfe6a2458 # v1.0.1
         with:
           project-url: https://github.com/orgs/pantheon-systems/projects/18/
           github-token: ${{ secrets.ADD_TO_PROJECT_ACTION_TOKEN }}
diff --git a/.github/workflows/pr-links.yml b/.github/workflows/pr-links.yml
index 4e1a59f302..1883c35ce4 100644
--- a/.github/workflows/pr-links.yml
+++ b/.github/workflows/pr-links.yml
@@ -8,10 +8,10 @@ jobs:
   linkChecker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
 
       - name: Link Checker
-        uses: lycheeverse/lychee-action@v1.7.0
+        uses: lycheeverse/lychee-action@97189f2c0a3c8b0cb0e704fd4e878af6e5e2b2c5 # v1.7.0
         with:
           args: >
             --accept 200,204,206,401,403,421,429
diff --git a/.github/workflows/prettier.yml b/.github/workflows/prettier.yml
index 7aa4c40e11..868a5d05e1 100644
--- a/.github/workflows/prettier.yml
+++ b/.github/workflows/prettier.yml
@@ -20,10 +20,10 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 0
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 'latest'
       - name: Install Node dependencies
diff --git a/.github/workflows/release-note-file.yml b/.github/workflows/release-note-file.yml
index dcd4b2f84b..20553239e9 100644
--- a/.github/workflows/release-note-file.yml
+++ b/.github/workflows/release-note-file.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 2  # Ensures we have at least one previous commit for diffing
 
diff --git a/.github/workflows/spam.yml b/.github/workflows/spam.yml
index 99f3f46e1b..4345a7d814 100644
--- a/.github/workflows/spam.yml
+++ b/.github/workflows/spam.yml
@@ -6,6 +6,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: close issue
-        uses: balevine/mark-as-spam@production
+        uses: balevine/mark-as-spam@9f9b68e6eaf35c84c5487b397182e792920039ba # production 2019-10-10T19:38:12Z
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/vitest.yml b/.github/workflows/vitest.yml
index fd7c0f1c38..b48154bf44 100644
--- a/.github/workflows/vitest.yml
+++ b/.github/workflows/vitest.yml
@@ -15,8 +15,8 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: 'latest'
       - run: npm ci
diff --git a/.github/workflows/welcome.yml b/.github/workflows/welcome.yml
index bf075dbfbb..624b1ed9e6 100644
--- a/.github/workflows/welcome.yml
+++ b/.github/workflows/welcome.yml
@@ -11,7 +11,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: wow-actions/welcome@v1
+      - uses: wow-actions/welcome@68019c2c271561f63162fea75bb7707ef8a02c85 # v1.3.1
         with:
           FIRST_ISSUE: |
             👋 @{{ author }}