diff --git a/.github/workflows/build-docs.yml b/.github/workflows/build-docs.yml
index 711975c..9e13b1a 100644
--- a/.github/workflows/build-docs.yml
+++ b/.github/workflows/build-docs.yml
@@ -9,7 +9,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.1
+    - uses: actions/checkout@v4
       with:
         persist-credentials: false
     - name: Set up Python
diff --git a/.github/workflows/build-master.yml b/.github/workflows/build-master.yml
index 0ed2eec..8dd8009 100644
--- a/.github/workflows/build-master.yml
+++ b/.github/workflows/build-master.yml
@@ -14,7 +14,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
       with:
@@ -33,7 +33,7 @@ jobs:
 #     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
       with:
@@ -55,7 +55,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
       with:
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 4fd04f4..cab1b3f 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -10,7 +10,7 @@ jobs:
     if: "contains(github.event.head_commit.message, 'Bump version')"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/test-and-lint.yml b/.github/workflows/test-and-lint.yml
index 115a80c..c9a5db9 100644
--- a/.github/workflows/test-and-lint.yml
+++ b/.github/workflows/test-and-lint.yml
@@ -15,7 +15,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
+    - uses: actions/checkout@cd7d8d697e10461458bc61a30d094dc601a8b017
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
       with:
@@ -33,7 +33,7 @@ jobs:
   #lint:
   #  runs-on: ubuntu-latest
   #  steps:
-  #  - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
+  #  - uses: actions/checkout@cd7d8d697e10461458bc61a30d094dc601a8b017
   #  - name: Set up Python
   #    uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c
   #    with: