diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index 821aae4..c234aaf 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.1
         with:
           submodules: recursive
 
diff --git a/.github/workflows/nf-test.yml b/.github/workflows/nf-test.yml
index e63c2df..5323c17 100644
--- a/.github/workflows/nf-test.yml
+++ b/.github/workflows/nf-test.yml
@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Check out pipeline code
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/publish-pypi-release.yml b/.github/workflows/publish-pypi-release.yml
index 94ac542..dbe840e 100644
--- a/.github/workflows/publish-pypi-release.yml
+++ b/.github/workflows/publish-pypi-release.yml
@@ -14,7 +14,7 @@ jobs:
       id-token: write
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.1
     - name: Set up Python
       uses: actions/setup-python@v6
       with: