diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88f41ee..a1b39c4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 7367af1..0fa2ef4 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
         with:
           python-version: "3.12"
 
@@ -71,4 +71,4 @@ jobs:
         with:
           name: dist
           path: dist/
-      - uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b  # release/v1
+      - uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b  # release/v1.14.0
diff --git a/Dockerfile b/Dockerfile
index bc826c2..160ea97 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,9 +10,9 @@ FROM python:3.14-slim
 # TARGETARCH is auto-populated by BuildKit (arm64/amd64) — do NOT give it a
 # default, or it shadows the real build arch and pulls the wrong-arch packages.
 ARG TARGETARCH
-ARG NOIR_VERSION=1.0.0
+ARG NOIR_VERSION=1.1.0
 ARG GITLEAKS_VERSION=8.30.1
-ARG TRIVY_VERSION=0.58.1
+ARG TRIVY_VERSION=0.59.1
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         ca-certificates curl git \
@@ -37,7 +37,7 @@ RUN case "${TARGETARCH}" in amd64) GL=x64 ;; arm64) GL=arm64 ;; *) GL="${TARGETA
     && tar -xzf /tmp/gl.tgz -C /usr/local/bin gitleaks && rm /tmp/gl.tgz
 
 # Semgrep (SAST) + Checkov (IaC)
-RUN pip install --no-cache-dir semgrep checkov
+RUN pip install --no-cache-dir semgrep==1.168.0 checkov==3.3.6
 
 # The tool
 WORKDIR /opt/websec
diff --git a/action.yml b/action.yml
index 377a129..a118849 100644
--- a/action.yml
+++ b/action.yml
@@ -35,7 +35,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
       with:
         python-version: "3.11"
 
@@ -54,7 +54,7 @@ runs:
 
     - name: Upload SARIF to Code Scanning
       if: ${{ always() && inputs.upload-sarif == 'true' }}
-      uses: github/codeql-action/upload-sarif@v4
+      uses: github/codeql-action/upload-sarif@8533807ff379ac610d2b2c389c47e7c629d31d13  # v4.36.3
       with:
         sarif_file: ${{ inputs.out }}/latest/results.sarif
         category: websec-validator
diff --git a/src/websec_validator/templates/probes/race-conditions.py b/src/websec_validator/templates/probes/race-conditions.py
index 4acf09e..ae481b1 100755
--- a/src/websec_validator/templates/probes/race-conditions.py
+++ b/src/websec_validator/templates/probes/race-conditions.py
@@ -16,11 +16,10 @@
   - Compare to expected_unique (usually 1 — only one assignment should win)
   - If success_count > expected_unique -> race condition likely
 
-Uses async httpx for true parallelism (synchronous loops can't trigger races).
+Uses asyncio.to_thread with urllib for parallelism (synchronous loops can't trigger races).
 
-Install: pip install httpx
 """
-import asyncio, httpx, json, os, re, sys
+import asyncio, json, os, re, sys, urllib.request, urllib.error
 from pathlib import Path
 from collections import Counter
 
@@ -46,23 +45,25 @@
 if not TARGETS:
     sys.exit("No write endpoints in probe-context.json — nothing to probe.")
 
-async def fire(client, t):
+def fire_sync(t):
     """Single request, return (status_code, response_body_preview)"""
     try:
-        r = await client.request(
-            t['method'], t['url'],
-            json=t['payload'],
-            headers=HEADERS,
-            timeout=30.0,
+        req = urllib.request.Request(
+            t['url'],
+            data=json.dumps(t['payload']).encode('utf-8') if t['payload'] else None,
+            headers={**HEADERS, "Content-Type": "application/json"} if t['payload'] else HEADERS,
+            method=t['method']
         )
-        return (r.status_code, r.text[:120])
+        with urllib.request.urlopen(req, timeout=30.0) as r:
+            return (r.status, r.read().decode('utf-8', errors='ignore')[:120])
+    except urllib.error.HTTPError as e:
+        return (e.code, e.read().decode('utf-8', errors='ignore')[:120])
     except Exception as e:
         return (None, str(e)[:120])
 
 async def run_target(t):
     print(f"  Firing {PARALLEL} parallel {t['method']} to {t['url'][len(TARGET):]}")
-    async with httpx.AsyncClient() as client:
-        results = await asyncio.gather(*[fire(client, t) for _ in range(PARALLEL)])
+    results = await asyncio.gather(*[asyncio.to_thread(fire_sync, t) for _ in range(PARALLEL)])
     codes = Counter(r[0] for r in results)
     success = sum(1 for r in results if r[0] and 200 <= r[0] < 300)
     race_likely = success > t['expected_unique']