diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 8698d6ef9..c108958a8 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -71,6 +71,34 @@ jobs:
           # of which Xcode built a given run.
           xcodebuild -version
 
+      - name: Reset the test simulators
+        # HealthChat: a hosted VM hands out a fresh simulator every run; this runner reuses the same
+        # devices, so app containers, caches and logs survive between runs. Suites asserting on clean
+        # state then fail on the previous run's leftovers — LoggingTests expects no log files and
+        # finds nine, in the same device container each time.
+        #
+        # Only the two devices the tooling pins are erased (UnitTests.swift, PreviewTests.swift,
+        # CI.swift), never `simctl erase all`: this machine is shared with the release pipeline, and
+        # a blanket wipe would take out simulator state that has nothing to do with this job. A
+        # missing device is not an error — the tooling creates it.
+        run: |
+          set -eu
+          for device in "iPhone 17" "iPhone SE (3rd generation)"; do
+            # Match on a trailing "(" so "iPhone 17" cannot also match "iPhone 17 Pro" — the same
+            # guard the tooling uses when it resolves a device.
+            udid=$(xcrun simctl list devices "iOS 26.5" available \
+                     | grep -F "$device (" \
+                     | grep -oE '[0-9A-F]{8}(-[0-9A-F]{4}){3}-[0-9A-F]{12}' \
+                     | head -1 || true)
+            if [ -n "$udid" ]; then
+              echo "Erasing $device ($udid)"
+              xcrun simctl shutdown "$udid" 2>/dev/null || true
+              xcrun simctl erase "$udid"
+            else
+              echo "$device not present — the tooling will create it"
+            fi
+          done
+
       - name: Run tests
         # HealthChat: previews are skipped. PreviewTests renders a snapshot for every preview in the
         # app and was the entire reason this job could not fit in an hour — it never once finished,