diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e7ef987..5cbd7c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up OCaml
         uses: ocaml/setup-ocaml@v3
@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up OCaml
         uses: ocaml/setup-ocaml@v3
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 7b019b2..a2f2a3e 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # CodeQL doesn't support OCaml directly, but we include this
       # for when/if JS tooling is added (e.g., playground, docs site)
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f87ca69..2adad9d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up OCaml
         uses: ocaml/setup-ocaml@v3