diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index e9fd28307c..c90ad19e69 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -31,7 +31,7 @@ jobs:
       # additionally enabling all checks defined in this project and any Error
       # Prone checks available only from other artifact repositories.
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
       - name: Set up JDK
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 9456ab1700..836058e38b 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
       - name: Set up JDK
diff --git a/.github/workflows/deploy-website.yaml b/.github/workflows/deploy-website.yaml
index a17d1a0bdd..3acca90eae 100644
--- a/.github/workflows/deploy-website.yaml
+++ b/.github/workflows/deploy-website.yaml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
       - uses: ruby/setup-ruby@v1.126.0
diff --git a/.github/workflows/openssf-scorecard.yml b/.github/workflows/openssf-scorecard.yml
index 202e8c170d..1961745a02 100644
--- a/.github/workflows/openssf-scorecard.yml
+++ b/.github/workflows/openssf-scorecard.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
       - name: Run OpenSSF Scorecard analysis
diff --git a/.github/workflows/pitest-analyze-pr.yml b/.github/workflows/pitest-analyze-pr.yml
index 5a14fa2ae9..ead5ec8fc0 100644
--- a/.github/workflows/pitest-analyze-pr.yml
+++ b/.github/workflows/pitest-analyze-pr.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           fetch-depth: 2
           persist-credentials: false
diff --git a/.github/workflows/pitest-update-pr.yml b/.github/workflows/pitest-update-pr.yml
index cbaae60813..9f09bdaa8f 100644
--- a/.github/workflows/pitest-update-pr.yml
+++ b/.github/workflows/pitest-update-pr.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
       - name: Set up JDK
diff --git a/.github/workflows/sonarcloud.yml b/.github/workflows/sonarcloud.yml
index 5df6b84646..2ee0307f47 100644
--- a/.github/workflows/sonarcloud.yml
+++ b/.github/workflows/sonarcloud.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v3.1.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           fetch-depth: 0
           persist-credentials: false