diff --git a/.github/workflows/ci-docs.yml b/.github/workflows/ci-docs.yml
index adfc205..caa775d 100644
--- a/.github/workflows/ci-docs.yml
+++ b/.github/workflows/ci-docs.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         # need history and tags for versioneer
         fetch-depth: 0
@@ -92,7 +92,7 @@ jobs:
 
     steps:
     - name: Checkout docs
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: gh-pages
 
diff --git a/.github/workflows/ci-integration.yml b/.github/workflows/ci-integration.yml
index 2e170a3..0d75529 100644
--- a/.github/workflows/ci-integration.yml
+++ b/.github/workflows/ci-integration.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         # need history and tags for versioneer
         fetch-depth: 0
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0c85e60..1f22c5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         # need history and tags for versioneer
         fetch-depth: 0
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index c95d9a6..0d8513e 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -40,7 +40,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL