diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 880cc90c09ee5..f3ab64eafc455 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -66,7 +66,7 @@ jobs:
       - name: Determine fetch depth
         run: echo "FETCH_DEPTH=$((${{ github.event.pull_request.commits }} + 2))" >> "$GITHUB_ENV"
       - *ANNOTATION_PR_NUMBER
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: ${{ env.FETCH_DEPTH }}
@@ -148,7 +148,7 @@ jobs:
 
       - &CHECKOUT
         name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Ensure the latest merged pull request state is used, even on re-runs.
           ref: &CHECKOUT_REF_TMPL ${{ github.event_name == 'pull_request' && github.ref || '' }}
@@ -610,7 +610,7 @@ jobs:
       - *ANNOTATION_PR_NUMBER
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: *CHECKOUT_REF_TMPL
           fetch-depth: 0
diff --git a/src/ipc/libmultiprocess/.github/workflows/ci.yml b/src/ipc/libmultiprocess/.github/workflows/ci.yml
index 87b170657b162..17aea3774dad1 100644
--- a/src/ipc/libmultiprocess/.github/workflows/ci.yml
+++ b/src/ipc/libmultiprocess/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
       run:
         shell: openbsd {0}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Start OpenBSD VM
         uses: vmactions/openbsd-vm@v1
@@ -41,7 +41,7 @@ jobs:
       run:
         shell: freebsd {0}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Start FreeBSD VM
         uses: vmactions/freebsd-vm@v1
@@ -61,7 +61,7 @@ jobs:
     name: build • macos
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install dependencies
         env:
@@ -84,7 +84,7 @@ jobs:
     name: build • ${{ matrix.config }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Nix
         uses: cachix/install-nix-action@v31       # 2025-05-27, from https://github.com/cachix/install-nix-action/tags
diff --git a/src/secp256k1/.github/workflows/ci.yml b/src/secp256k1/.github/workflows/ci.yml
index dceab4f8abb87..2f9992eb32f43 100644
--- a/src/secp256k1/.github/workflows/ci.yml
+++ b/src/secp256k1/.github/workflows/ci.yml
@@ -109,7 +109,7 @@ jobs:
     steps:
       - &CHECKOUT
         name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - &CI_SCRIPT_IN_DOCKER
         name: CI script