diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index b8bd5e3..69add41 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -12,7 +12,7 @@ jobs:
     name: Test on Ubuntu with gcc
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies
@@ -31,7 +31,7 @@ jobs:
     needs: [build-base]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies
@@ -61,7 +61,7 @@ jobs:
         - { os: ubuntu-22.04, compiler: gcc, cxxcompiler: g++, ld: bfd } # = gcc-11
         - { os: ubuntu-22.04, compiler: clang, cxxcompiler: clang++, ld: lld } # = clang-14
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies
@@ -98,7 +98,7 @@ jobs:
     needs: [build-base]
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Set up Homebrew
@@ -119,7 +119,7 @@ jobs:
     needs: [build-base]
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Set up Windows SDK
@@ -159,7 +159,7 @@ jobs:
     needs: [build-base]
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies
@@ -186,7 +186,7 @@ jobs:
         - { arch: riscv64, compiler: gcc, cxxcompiler: g++ }
         - { arch: s390x, compiler: gcc, cxxcompiler: g++ }
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
       - uses: uraimo/run-on-arch-action@master
@@ -222,7 +222,7 @@ jobs:
         - -Daesni=disabled
         - -Daesni=disabled -Dopenssl=disabled
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies
diff --git a/.github/workflows/nist.yaml b/.github/workflows/nist.yaml
index 44202b6..e44e48e 100644
--- a/.github/workflows/nist.yaml
+++ b/.github/workflows/nist.yaml
@@ -12,7 +12,7 @@ jobs:
     name: Build submission package
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Install Linux dependencies