diff --git a/.github/workflows/update-platformdetect.yml b/.github/workflows/update-platformdetect.yml
new file mode 100644
index 00000000..974e7062
--- /dev/null
+++ b/.github/workflows/update-platformdetect.yml
@@ -0,0 +1,45 @@
+# SPDX-FileCopyrightText: 2026 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+name: Update PlatformDetect Dependency
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 10 * * 1"
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-platformdetect:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Current Repo
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Update PlatformDetect dependency
+        id: update-platformdetect
+        run: |
+          python scripts/update_platformdetect_min.py
+          if git diff --quiet -- setup.py; then
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create pull request
+        if: steps.update-platformdetect.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v6
+        with:
+          branch: update-platformdetect-dependency
+          commit-message: Update PlatformDetect dependency
+          title: Update PlatformDetect dependency
+          body: Updates Blinka's minimum Adafruit-PlatformDetect dependency to the latest PyPI release.
+          delete-branch: true
diff --git a/scripts/update_platformdetect_min.py b/scripts/update_platformdetect_min.py
new file mode 100644
index 00000000..a19d3398
--- /dev/null
+++ b/scripts/update_platformdetect_min.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""Update the minimum Adafruit-PlatformDetect dependency in setup.py."""
+
+from __future__ import annotations
+
+import argparse
+import json
+import re
+import sys
+import urllib.request
+from pathlib import Path
+
+
+PYPI_URL = "https://pypi.org/pypi/Adafruit-PlatformDetect/json"
+SETUP_PY = Path("setup.py")
+REQUIREMENT_RE = re.compile(r'("Adafruit-PlatformDetect>=)([^"]+)(")')
+
+
+def release_tuple(version: str) -> tuple[int, ...]:
+    """Return the numeric release segment for simple PyPI version comparisons."""
+    match = re.match(r"^\d+(?:\.\d+)*", version)
+    if not match:
+        raise ValueError(f"Unsupported version format: {version}")
+    return tuple(int(part) for part in match.group(0).split("."))
+
+
+def latest_pypi_version() -> str:
+    with urllib.request.urlopen(PYPI_URL, timeout=30) as response:
+        payload = json.load(response)
+    return payload["info"]["version"]
+
+
+def update_requirement(version: str) -> bool:
+    setup_text = SETUP_PY.read_text(encoding="utf-8")
+    match = REQUIREMENT_RE.search(setup_text)
+    if not match:
+        raise RuntimeError(
+            "Could not find Adafruit-PlatformDetect requirement in setup.py"
+        )
+
+    current_version = match.group(2)
+    if release_tuple(version) <= release_tuple(current_version):
+        print(
+            "Adafruit-PlatformDetect minimum is already current "
+            f"({current_version}; latest is {version})"
+        )
+        return False
+
+    updated_text = REQUIREMENT_RE.sub(rf"\g<1>{version}\3", setup_text, count=1)
+    SETUP_PY.write_text(updated_text, encoding="utf-8")
+    print(
+        f"Updated Adafruit-PlatformDetect minimum from {current_version} to {version}"
+    )
+    return True
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "version",
+        nargs="?",
+        help="Version to set. Defaults to the latest Adafruit-PlatformDetect version on PyPI.",
+    )
+    args = parser.parse_args()
+
+    version = args.version or latest_pypi_version()
+    update_requirement(version)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())