diff --git a/.github/workflows/alpine-test.yml b/.github/workflows/alpine-test.yml
index ceba11fb8..a9c29117e 100644
--- a/.github/workflows/alpine-test.yml
+++ b/.github/workflows/alpine-test.yml
@@ -26,7 +26,7 @@ jobs:
         adduser runner docker
       shell: sh -exo pipefail {0}  # Run this as root, not the "runner" user.
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0
 
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 2bee952af..9191471c3 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -47,7 +47,7 @@ jobs:
         # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Add any setup steps before running the `github/codeql-action/init` action.
     # This includes steps like installing compilers or runtimes (`actions/setup-node`
diff --git a/.github/workflows/cygwin-test.yml b/.github/workflows/cygwin-test.yml
index cc9e1edf0..5c42c8583 100644
--- a/.github/workflows/cygwin-test.yml
+++ b/.github/workflows/cygwin-test.yml
@@ -34,7 +34,7 @@ jobs:
         git config --global core.autocrlf false  # Affects the non-Cygwin git.
       shell: pwsh  # Do this outside Cygwin, to affect actions/checkout.
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0
 
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index ceba0dd85..16978f9a8 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - uses: actions/setup-python@v5
       with:
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 4457a341f..4e5d82a55 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -39,7 +39,7 @@ jobs:
         shell: bash --noprofile --norc -exo pipefail {0}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0