diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index 1586e73e..6e391783 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -14,6 +14,7 @@ jobs:
     name: Scorecard analysis
     runs-on: ubuntu-latest
     permissions:
+      contents: read
       # Needed to upload the results to code-scanning dashboard.
       security-events: write
       # Used to receive a badge. (Upcoming feature)
@@ -21,19 +22,20 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
         with:
           persist-credentials: false
 
       - name: "Run Scorecard"
-        uses: ossf/scorecard-action@v2.3.0
+        # v2.4.4 uses GHCR; the old v2.3.0 GCR image fails before scanning.
+        uses: ossf/scorecard-action@2d1146689b8cda280b9bc96326124645441f03bc # v2.4.4
         with:
           results_file: results.sarif
           results_format: sarif
           publish_results: true
 
       - name: "Upload SARIF results to code scanning"
-        uses: github/codeql-action/upload-sarif@v2
+        uses: github/codeql-action/upload-sarif@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4
         with:
           sarif_file: results.sarif
           wait-for-processing: true