diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index 3cb278b..4fefe74 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -21,7 +21,7 @@ jobs:
         r-version: [release]
         os: [ubuntu-latest]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 5433710..e941a89 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -6,7 +6,7 @@ jobs:
   code-quality:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python.
       uses: actions/setup-python@v4
       with:
@@ -24,7 +24,7 @@ jobs:
         r-version: [4.2, 'release']
         os: [ubuntu-20.04, ubuntu-22.04, ubuntu-latest, macOS-latest]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/webpages.yml b/.github/workflows/webpages.yml
index 949c0a7..0e50a2e 100644
--- a/.github/workflows/webpages.yml
+++ b/.github/workflows/webpages.yml
@@ -13,7 +13,7 @@ jobs:
     name: sphinx_html
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
@@ -23,7 +23,7 @@ jobs:
         with:
           r-version: ${{ env.R-VERSION }}
       - name: Cache R packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-R-packages
         with:
@@ -47,7 +47,7 @@ jobs:
           make html
           git rev-parse --short HEAD > _build/html/.revforbuild
       - name: Archive documentation
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: html-doc
           path: doc/_build/html
@@ -57,7 +57,7 @@ jobs:
     needs: job_1
     steps:
       - name: Checkout gh-pages
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           fetch-depth: 2