diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 3c663f71..40025a9e 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -15,7 +15,7 @@ jobs:
   dist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 48f3ebac..41309ef0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 8
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -117,7 +117,7 @@ jobs:
             cmake-version: "4.0"
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 
@@ -170,7 +170,7 @@ jobs:
         runs-on: [ubuntu-latest, macos-15-intel, windows-latest]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 
@@ -214,7 +214,7 @@ jobs:
     timeout-minutes: 40
     container: quay.io/pypa/musllinux_1_2_x86_64:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -234,7 +234,7 @@ jobs:
     timeout-minutes: 40
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -273,7 +273,7 @@ jobs:
           pacboy: >-
             python:p python-pip:p gcc:p cmake:p
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -306,7 +306,7 @@ jobs:
           pacboy: >-
             python:p python-pip:p gcc:p cmake:p
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -327,7 +327,7 @@ jobs:
     timeout-minutes: 5
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -343,7 +343,7 @@ jobs:
         runs-on: [ubuntu-latest, macos-latest] # Windows command output issue (wrong Python selected)
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
diff --git a/.github/workflows/nightlies.yml b/.github/workflows/nightlies.yml
index fa5bb579..47e44a8d 100644
--- a/.github/workflows/nightlies.yml
+++ b/.github/workflows/nightlies.yml
@@ -17,7 +17,7 @@ jobs:
     if: github.repository_owner == 'scikit-build'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0