diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index efdf57ef..3967d811 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -16,7 +16,7 @@ jobs:
         python-version: ["3.11", "3.12", "3.13", "3.14"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           # Need to clone everything for the git tags.
           fetch-depth: 0
@@ -78,7 +78,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           # Need to clone everything to embed the version.
           fetch-depth: 0
diff --git a/.github/workflows/build_docs.yaml b/.github/workflows/build_docs.yaml
index 22dcb1d7..a85ea241 100644
--- a/.github/workflows/build_docs.yaml
+++ b/.github/workflows/build_docs.yaml
@@ -10,7 +10,7 @@ jobs:
   build_sphinx_docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           # Need to clone everything for the git tags.
           fetch-depth: 0
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 3c53cd18..f961c27a 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -42,7 +42,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/do_not_merge.yaml b/.github/workflows/do_not_merge.yaml
index 5cc4911d..fbed4495 100644
--- a/.github/workflows/do_not_merge.yaml
+++ b/.github/workflows/do_not_merge.yaml
@@ -26,7 +26,7 @@ jobs:
             'DO NOT MERGE'. Remove this commit from the branch before merging
             or change the commit summary."
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Check requirements.txt for branches
         shell: bash
diff --git a/.github/workflows/docstyle.yaml b/.github/workflows/docstyle.yaml
index e6df0b55..93190c1b 100644
--- a/.github/workflows/docstyle.yaml
+++ b/.github/workflows/docstyle.yaml
@@ -14,7 +14,7 @@ jobs:
   numpydoc:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6