diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ff2db05..80a3a9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,8 +16,8 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-python@v6
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
         with:
           python-version: ${{ matrix.python-version }}
           cache: pip
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 3326f0c..688b3d5 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -16,8 +16,8 @@ jobs:
   analyze:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: github/codeql-action/init@v4
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
+      - uses: github/codeql-action/init@4c0873ef8656cb3c50b3f42fb63bc1ade0cfa827
         with:
           languages: python
-      - uses: github/codeql-action/analyze@v4
+      - uses: github/codeql-action/analyze@4c0873ef8656cb3c50b3f42fb63bc1ade0cfa827
diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 88257e6..c8f8827 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -24,9 +24,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262
       - name: Configure Pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b
       - name: Assemble website
         shell: bash
         run: |
@@ -52,7 +52,7 @@ jobs:
           test -f _site/demo/demo.css
           test -f _site/demo/demo.js
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa
         with:
           path: _site
 
@@ -65,4 +65,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a59151e..5548aa0 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,8 +16,8 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-python@v6
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
         with:
           python-version: "3.13"
           cache: pip
diff --git a/.github/workflows/swebench-lite-canary.yml b/.github/workflows/swebench-lite-canary.yml
index be21dd1..604bd9b 100644
--- a/.github/workflows/swebench-lite-canary.yml
+++ b/.github/workflows/swebench-lite-canary.yml
@@ -37,10 +37,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
         with:
           python-version: "3.11"
           cache: pip
@@ -169,7 +169,7 @@ jobs:
 
       - name: Upload benchmark evidence
         if: always()
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
         with:
           name: swebench-lite-${{ inputs.task_set }}-${{ github.run_id }}
           if-no-files-found: warn
diff --git a/tests/evaluation/test_swebench_lite_workflow.py b/tests/evaluation/test_swebench_lite_workflow.py
index 71241d0..fe1c6a5 100644
--- a/tests/evaluation/test_swebench_lite_workflow.py
+++ b/tests/evaluation/test_swebench_lite_workflow.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import re
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[2]
@@ -19,7 +20,8 @@ def test_workflow_is_manual_modal_only_and_compares_both_lanes() -> None:
     assert "marginal_predictions.ndjson" in text
     assert text.count("--modal true") == 2
     assert "marginal public-eval" in text
-    assert "actions/upload-artifact@v7" in text
+    assert not re.search(r"actions/upload-artifact@v\d+", text)
+    assert re.search(r"actions/upload-artifact@[0-9a-f]{40}", text)
 
 
 def test_readme_refuses_gold_as_marginal_evidence() -> None: