diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 552a1794..a7c8ce9b 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -38,7 +38,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           # Need to fetch more than the last commit so that setuptools-scm can
           # create the correct version string. If the number of commits since
@@ -134,7 +134,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
 
       # Fetch the built docs from the "build" job
       - name: Download HTML documentation artifact
@@ -144,7 +144,7 @@ jobs:
           path: doc/_build/html
 
       - name: Checkout the gh-pages branch in a separate folder
-        uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
+        uses: actions/checkout@8410ad0602e1e429cee44a835ae9f77f654a6694
         with:
           ref: gh-pages
           # Checkout to this folder instead of the current one
diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index b3b58e04..43132489 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -32,7 +32,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           # Need to fetch more than the last commit so that setuptools_scm can
           # create the correct version string. If the number of commits since
@@ -87,7 +87,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           # The GitHub token is preserved by default but this job doesn't need
           # to be able to push to GitHub.
diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
index b4a567e3..6e8520ac 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           persist-credentials: false
 
@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           persist-credentials: false
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 75e5bc05..f84ed50c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -61,7 +61,7 @@ jobs:
 
       # Checks-out your repository under $GITHUB_WORKSPACE
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.2
         with:
           # Need to fetch more than the last commit so that setuptools_scm can
           # create the correct version string. If the number of commits since