diff --git a/.github/workflows/render-diagrams.yml b/.github/workflows/render-diagrams.yml
index 1e6648d..de19413 100644
--- a/.github/workflows/render-diagrams.yml
+++ b/.github/workflows/render-diagrams.yml
@@ -23,7 +23,7 @@ jobs:
         run: npm ci
 
       - name: Install Puppeteer for rendering
-        run: npm install puppeteer --no-save
+        run: npm install puppeteer@24.37.5 --no-save
 
       - name: Render Mermaid to SVG
         run: npx -y @mermaid-js/mermaid-cli -i "docs/diagrams/*.mmd" -o docs/diagrams -f svg
diff --git a/scripts/render-local.ps1 b/scripts/render-local.ps1
index 52d68cb..ecf45f8 100644
--- a/scripts/render-local.ps1
+++ b/scripts/render-local.ps1
@@ -148,9 +148,9 @@ if (-not $SkipChromiumDownload) {
   Write-Output 'Installing puppeteer (this will download Chromium). This can take several minutes.'
   $success = $false
   for ($try=1; $try -le $pptInstallRetries; $try++) {
-    Write-Output "Attempt $try of $($pptInstallRetries): npm install puppeteer --no-audit --no-fund"
+    Write-Output "Attempt $try of $($pptInstallRetries): npm install puppeteer@24.37.5 --no-audit --no-fund"
     try {
-      npm install puppeteer --no-audit --no-fund
+      npm install puppeteer@24.37.5 --no-audit --no-fund
       if ($LASTEXITCODE -eq 0) { $success = $true; break }
       Write-Warning "npm exited with code $LASTEXITCODE"
     } catch {