diff --git a/.github/workflows/update-fls.yaml b/.github/workflows/update-fls.yaml
new file mode 100644
index 0000000..55aa3f9
--- /dev/null
+++ b/.github/workflows/update-fls.yaml
@@ -0,0 +1,26 @@
+name: Update FLS
+on:
+  schedule:
+    - cron: "05 0 * * *"
+  workflow_dispatch:
+jobs:
+    update-fls:
+      runs-on: ubuntu-latest
+      steps:
+        - name: Check out the repo
+          uses: actions/checkout@v4
+        - name: Install uv
+          uses: astral-sh/setup-uv@v6
+        - name: Update FLS
+          run: |
+            ./test_update_fls.sh
+        - name: Create Pull Request
+          uses: peter-evans/create-pull-request@v4
+          with:
+            commit-message: Update FLS (automated PR)
+            title: Update FLS (automated PR)
+            body: Update FLS (automated PR)
+            base: main
+            labels: automated-pr
+            branch: update-fls
+            delete-branch: true
diff --git a/builder/build_cli.py b/builder/build_cli.py
index a3201e0..d935c02 100644
--- a/builder/build_cli.py
+++ b/builder/build_cli.py
@@ -49,7 +49,7 @@ def build_docs(
 
     dest = root / "build"
 
-    args = ["-b", builder, "-d", dest / "doctrees"]
+    args = ["-b", builder, "-d", dest / "doctrees", "-wtest.txt"]
 
     if debug:
         # Disable parallel builds and show exceptions in debug mode.
diff --git a/test_update_fls.sh b/test_update_fls.sh
new file mode 100755
index 0000000..06c9cff
--- /dev/null
+++ b/test_update_fls.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+./make.py
+if [ $? -eq "0" ];then
+  echo "FLS is up to date"
+  exit 0 # No error, no update required
+else
+  grep -q "ERROR: The FLS specification has changed since the lock file was created:" test.txt
+  OUTOFDATE=$?
+  grep -q "Found differences between live FLS data and lock file affecting 0 guidelines" test.txt
+  ZEROAFFECTED=$?
+
+  if [ $OUTOFDATE -eq "0" ]; then
+    if [ $ZEROAFFECTED -eq "0" ]; then
+      ./make.py --update-spec-lock-file
+      rm test.txt
+      exit 1 # Can be updated automatically
+    else
+      ./make.py --update-spec-lock-file
+      rm test.txt
+      exit 2 # Guidelines need human review
+    fi
+  fi
+fi
+
+rm test.txt
+exit 3 # Other build error not related to FLS