diff --git a/.github/workflows/pre_commit_detect_outdated.yml b/.github/workflows/pre_commit_detect_outdated.yml
index 23a213a..f5cc2f6 100644
--- a/.github/workflows/pre_commit_detect_outdated.yml
+++ b/.github/workflows/pre_commit_detect_outdated.yml
@@ -18,7 +18,7 @@ jobs:
     name: Detect outdated pre-commit hooks
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac  # v4.0.0
 
       - name: Set up Python 3.11
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1  # v4.7.0
diff --git a/.github/workflows/pre_commit_run.yml b/.github/workflows/pre_commit_run.yml
index 8441595..889d086 100644
--- a/.github/workflows/pre_commit_run.yml
+++ b/.github/workflows/pre_commit_run.yml
@@ -12,7 +12,7 @@ jobs:
     name: Run pre-commit on all files
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac  # v4.0.0
 
       - name: Set up Python 3.8
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1  # v4.7.0
diff --git a/.github/workflows/python_test_suite.yml b/.github/workflows/python_test_suite.yml
index e6bf9e4..b46b6dd 100644
--- a/.github/workflows/python_test_suite.yml
+++ b/.github/workflows/python_test_suite.yml
@@ -15,7 +15,7 @@ jobs:
         python-version: [3.8, 3.11]  # no particular need for in-between versions
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac  # v4.0.0
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1  # v4.7.0