diff --git a/.github/workflows/adr-check.yml b/.github/workflows/adr-check.yml
index 4ea0da4f..2ec34616 100644
--- a/.github/workflows/adr-check.yml
+++ b/.github/workflows/adr-check.yml
@@ -38,7 +38,7 @@ jobs:
       pull-requests: write # only for the optional comment when a PR is open
     steps:
       - name: Checkout the dispatched branch
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Full history so the merge-base with the base ref resolves for the diff.
           fetch-depth: 0
diff --git a/.github/workflows/analyzers.yml b/.github/workflows/analyzers.yml
index 01c41270..3acc25fb 100644
--- a/.github/workflows/analyzers.yml
+++ b/.github/workflows/analyzers.yml
@@ -32,7 +32,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
@@ -62,7 +62,7 @@ jobs:
       FLOORCHECK_VERSION: 1.0.0-floorcheck.${{ github.run_number }}.${{ github.run_attempt }}
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Setup SDKs (release + floor)
         uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
diff --git a/.github/workflows/canary.yml b/.github/workflows/canary.yml
index d5fa2aff..06e2935a 100644
--- a/.github/workflows/canary.yml
+++ b/.github/workflows/canary.yml
@@ -39,7 +39,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       # Best effort: a preview for the next major may not be published yet, or may fail to install. Marking this
       # step continue-on-error keeps that from reddening the canary — the build/run steps below are gated on its
diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
index a1341e9f..d1f41364 100644
--- a/.github/workflows/changelog.yml
+++ b/.github/workflows/changelog.yml
@@ -52,7 +52,7 @@ jobs:
       pull-requests: write   # open the review pull request
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Always draft from main, whatever branch the dispatch UI had selected:
           # collect-prs.sh gathers PRs merged into main, so drafting on any other
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 590b346d..1e64168c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,7 +39,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Setup .NET
         uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
@@ -85,7 +85,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       # global.json pins the .NET 10 SDK; that SDK compiles the net472 target. The .NET Framework runtime that
       # RUNS net472 assemblies ships on the windows-latest image, and the net472 targeting pack for COMPILATION
@@ -126,7 +126,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       # Two SDKs on purpose: 10.0.x satisfies the repo global.json (which pins the .NET 10 SDK) so the build
       # runs normally, and 8.0.x brings the .NET 8 runtime — the floor the tooling ships against — so the run
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index f1ad732a..4e95262f 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -34,7 +34,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@99df26d4f13ea111d4ec1a7dddef6063f76b97e9 # v4
diff --git a/.github/workflows/commit-lint.yml b/.github/workflows/commit-lint.yml
index 00b43d03..b76183d8 100644
--- a/.github/workflows/commit-lint.yml
+++ b/.github/workflows/commit-lint.yml
@@ -18,7 +18,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Need the PR's commits, so fetch full history rather than a shallow tip.
           fetch-depth: 0
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index c7b59560..247122b1 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -31,7 +31,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Dependency review
         uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
diff --git a/.github/workflows/dummies.yml b/.github/workflows/dummies.yml
index d5a1e072..820fa92f 100644
--- a/.github/workflows/dummies.yml
+++ b/.github/workflows/dummies.yml
@@ -45,7 +45,7 @@ jobs:
       DUMMIESCHECK_VERSION: 1.0.0-dummiescheck.${{ github.run_number }}.${{ github.run_attempt }}
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       # Three SDKs on purpose: 10.0.x is the SDK release.yml packs with, so the pack step produces the exact
       # artifact consumers receive; 8.0.x and 6.0.x bring the .NET 8 and .NET 6 RUNTIMES so each consumer leg
diff --git a/.github/workflows/gendoc-docs.yml b/.github/workflows/gendoc-docs.yml
index 9bf9379d..5492cc03 100644
--- a/.github/workflows/gendoc-docs.yml
+++ b/.github/workflows/gendoc-docs.yml
@@ -38,7 +38,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           ref: ${{ github.head_ref }}
 
diff --git a/.github/workflows/release-dryrun.yml b/.github/workflows/release-dryrun.yml
index 6de6f528..6fa9d20a 100644
--- a/.github/workflows/release-dryrun.yml
+++ b/.github/workflows/release-dryrun.yml
@@ -47,7 +47,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Full history + tags so the release-notes rehearsal below can resolve the previous same-train tag.
           fetch-depth: 0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 95444a9b..2c9049c6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -72,7 +72,7 @@ jobs:
       attestations: write
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Full history + tags so tools/packaging/release-notes.sh can resolve the previous
           # same-train tag — the lower bound of the release-notes commit range.
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index 85115957..085482a2 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -43,7 +43,7 @@ jobs:
       # actions: read
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # A credential-free checkout — Scorecard's own Token-Permissions check rewards it.
           persist-credentials: false
diff --git a/.github/workflows/sonar.yml b/.github/workflows/sonar.yml
index 0e1eb3f1..292988b5 100644
--- a/.github/workflows/sonar.yml
+++ b/.github/workflows/sonar.yml
@@ -35,7 +35,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           # Full history lets Sonar attribute issues via git blame and detect new code.
           fetch-depth: 0