diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7ef38c9..0a72d2f 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -57,7 +57,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/manual.yaml b/.github/workflows/manual.yaml
index 096cd54..fed859a 100644
--- a/.github/workflows/manual.yaml
+++ b/.github/workflows/manual.yaml
@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 9f1aa56..9fc18b0 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/sync-readme.yaml b/.github/workflows/sync-readme.yaml
index e3b6e3e..e0ebe55 100644
--- a/.github/workflows/sync-readme.yaml
+++ b/.github/workflows/sync-readme.yaml
@@ -14,13 +14,13 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Save README.md in temporary file
         run: cp -f README.md ${{ runner.temp }}/README.md
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages