diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index eb6690b..5d65016 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-13
+          - os: macos-14
             target: x86_64-apple-darwin
           - os: macos-14
             target: aarch64-apple-darwin
diff --git a/tests/test_engine/test_db.py b/tests/test_engine/test_db.py
index d6f1703..506d401 100644
--- a/tests/test_engine/test_db.py
+++ b/tests/test_engine/test_db.py
@@ -100,14 +100,18 @@ def test_insert_and_get_upload_job(self, db: IndexDB) -> None:
         assert jobs[0]["job_id"] == "job1"
         assert jobs[0]["backend_name"] == "s3"
 
-    def test_concurrent_reads(self, db: IndexDB) -> None:
-        """WAL mode allows concurrent reads."""
+    def test_concurrent_reads(self, db: IndexDB, tmp_path: Path) -> None:
+        """WAL mode allows concurrent reads from separate connections."""
         db.insert_capture("a", "/tmp/a", "2026-03-01T10:00:00Z")
+        db_path = tmp_path / "index.db"
         results = []
 
         def read_cap():
-            cap = db.get_capture("a")
+            reader = IndexDB(db_path)
+            reader.initialize()
+            cap = reader.get_capture("a")
             results.append(cap is not None)
+            reader.close()
 
         threads = [threading.Thread(target=read_cap) for _ in range(5)]
         for t in threads: