diff --git a/.github/workflows/GHPages.yml b/.github/workflows/GHPages.yml
index 1eec2bda..c61890d5 100644
--- a/.github/workflows/GHPages.yml
+++ b/.github/workflows/GHPages.yml
@@ -24,7 +24,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout
-              uses: actions/checkout@v3
+              uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - uses: actions/setup-node@v3
               with:
                   node-version: 18
diff --git a/.github/workflows/NodeCI.yml b/.github/workflows/NodeCI.yml
index 20f17976..4536b3d4 100644
--- a/.github/workflows/NodeCI.yml
+++ b/.github/workflows/NodeCI.yml
@@ -10,7 +10,7 @@ jobs:
     lint:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - uses: actions/setup-node@v3
               with:
                   node-version: 18
@@ -26,7 +26,7 @@ jobs:
             matrix:
                 node-version: [18.x, 20.x]
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - name: Use Node.js ${{ matrix.node-version }}
               uses: actions/setup-node@v3
               with:
@@ -38,7 +38,7 @@ jobs:
     test-and-coverage:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - uses: actions/setup-node@v3
             - name: Install Packages
               run: npm ci
@@ -51,7 +51,7 @@ jobs:
     update:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
             - uses: actions/setup-node@v3
               with:
                   node-version: 18
diff --git a/.github/workflows/Release.yml b/.github/workflows/Release.yml
index f48b9d02..8cfa6ac3 100644
--- a/.github/workflows/Release.yml
+++ b/.github/workflows/Release.yml
@@ -16,7 +16,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout Repo
-              uses: actions/checkout@v3
+              uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
               with:
                   # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
                   fetch-depth: 0