diff --git a/.github/workflows/benchmark-rust.yml b/.github/workflows/benchmark-rust.yml
index 9d3b825..86f1e5f 100644
--- a/.github/workflows/benchmark-rust.yml
+++ b/.github/workflows/benchmark-rust.yml
@@ -9,7 +9,7 @@ jobs:
     permissions:
       contents: read
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         lfs: true
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 0f97e73..1a65aa3 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -18,7 +18,7 @@ jobs:
     permissions:
       contents: read
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         lfs: true
diff --git a/.github/workflows/ci-aot.yml b/.github/workflows/ci-aot.yml
index 04cf497..09f80db 100644
--- a/.github/workflows/ci-aot.yml
+++ b/.github/workflows/ci-aot.yml
@@ -20,7 +20,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # fetching all
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 549c0a0..12ddda6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     permissions:
       contents: read
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         lfs: true
diff --git a/.github/workflows/pack.yml b/.github/workflows/pack.yml
index 5ac2bda..82e0956 100644
--- a/.github/workflows/pack.yml
+++ b/.github/workflows/pack.yml
@@ -33,7 +33,7 @@ jobs:
       doc_version: ${{ steps.nbgv.outputs.SemVer2 }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         lfs: true