diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 171c31a..2f4d8ef 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
       # Actions pinned to commit SHAs (not mutable tags) so a compromised
       # upstream tag cannot inject code into this workflow. Dependabot keeps
       # the pins current.
-      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v6
 
       - name: Set up .NET 10 SDK
         uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
@@ -80,7 +80,7 @@ jobs:
     name: validate (qpdf + veraPDF)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v6
 
       - name: Set up .NET 10 SDK
         uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8ce9145..9611ec5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v6
 
       - name: Set up .NET 10 SDK
         uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5