diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index c72612e..72bf05a 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Use OCaml ${{ matrix.ocaml-version }}
         uses: ocaml/setup-ocaml@v3
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4e32c92..654fd36 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Use OCaml 5.1
         uses: ocaml/setup-ocaml@v3
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Use OCaml 5.1
         uses: ocaml/setup-ocaml@v3
@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Use OCaml 5.1
         uses: ocaml/setup-ocaml@v3
diff --git a/.github/workflows/opam-dependency-submission.yml b/.github/workflows/opam-dependency-submission.yml
index 29a3c60..df2ec87 100644
--- a/.github/workflows/opam-dependency-submission.yml
+++ b/.github/workflows/opam-dependency-submission.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout tree
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set-up OCaml 5.1
         uses: ocaml/setup-ocaml@v3