diff --git a/.github/workflows/check-deprecated-exercises.yml b/.github/workflows/check-deprecated-exercises.yml
index 0f011b79e..8defbd0cf 100644
--- a/.github/workflows/check-deprecated-exercises.yml
+++ b/.github/workflows/check-deprecated-exercises.yml
@@ -14,7 +14,7 @@ jobs:
     name: Check for deprecated exercises
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
         with:
           fetch-depth: 0
       - name: Test deprecated exercises using test-deprecated-exercises
diff --git a/.github/workflows/java.yml b/.github/workflows/java.yml
index 5d4af4494..8d43f8e60 100644
--- a/.github/workflows/java.yml
+++ b/.github/workflows/java.yml
@@ -15,7 +15,7 @@ jobs:
     name: Check if tests compile cleanly with starter sources
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Set up JDK 21
         uses: actions/setup-java@f2beeb24e141e01a676f977032f5a29d81c9e27e
         with:
@@ -29,7 +29,7 @@ jobs:
     name: Lint Java files using Checkstyle
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Set up JDK 21
         uses: actions/setup-java@f2beeb24e141e01a676f977032f5a29d81c9e27e
         with:
@@ -44,7 +44,7 @@ jobs:
     if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Test all exercises using java-test-runner
         run: bin/test-with-test-runner
       - name: Print summary
@@ -71,7 +71,7 @@ jobs:
     if: github.event_name == 'pull_request'
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
         with:
           fetch-depth: 0
       - name: Test changed exercises using java-test-runner
diff --git a/.github/workflows/markdown.yml b/.github/workflows/markdown.yml
index 8339bd4db..a120524cd 100644
--- a/.github/workflows/markdown.yml
+++ b/.github/workflows/markdown.yml
@@ -17,6 +17,6 @@ jobs:
     name: Lint Markdown files
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Lint markdown
         uses: DavidAnson/markdownlint-cli2-action@07035fd053f7be764496c0f8d8f9f41f98305101