diff --git a/tests/test_db.py b/tests/test_db.py
index 4343e08..f03d03a 100644
--- a/tests/test_db.py
+++ b/tests/test_db.py
@@ -1,7 +1,10 @@
+import os
 import time
 
 import pytest
 
+from src.db import should_rebuild
+
 
 @pytest.fixture
 def parquet_and_db(tmp_path, monkeypatch):
@@ -13,55 +16,52 @@ def parquet_and_db(tmp_path, monkeypatch):
     return parquet, db
 
 
-def test_should_rebuild_when_db_missing(parquet_and_db, monkeypatch):
-    from src.db import should_rebuild
-
+def test_should_rebuild_when_db_missing(parquet_and_db):
     parquet, db = parquet_and_db
-    monkeypatch.setenv("DEVELOPMENT", "true")
     assert should_rebuild(db, parquet) is True
 
 
 def test_should_rebuild_prod_when_parquet_newer(parquet_and_db, monkeypatch):
-    from src.db import should_rebuild
-
     parquet, db = parquet_and_db
     db.write_bytes(b"x")
-    time.sleep(0.01)
     parquet.touch()
+    now = time.time()
+    os.utime(db, (now, now))
+    os.utime(parquet, (now + 10, now + 10))
     monkeypatch.setenv("DEVELOPMENT", "false")
     assert should_rebuild(db, parquet) is True
 
 
 def test_should_not_rebuild_prod_when_parquet_older(parquet_and_db, monkeypatch):
-    from src.db import should_rebuild
-
     parquet, db = parquet_and_db
     parquet.touch()
-    time.sleep(0.01)
     db.write_bytes(b"x")
+    now = time.time()
+    os.utime(parquet, (now, now))
+    os.utime(db, (now + 10, now + 10))
     monkeypatch.setenv("DEVELOPMENT", "false")
     assert should_rebuild(db, parquet) is False
 
 
 def test_should_not_rebuild_dev_even_when_parquet_newer(parquet_and_db, monkeypatch):
-    from src.db import should_rebuild
-
     parquet, db = parquet_and_db
     db.write_bytes(b"x")
-    time.sleep(0.01)
     parquet.touch()
+    now = time.time()
+    os.utime(db, (now, now))
+    os.utime(parquet, (now + 10, now + 10))
     monkeypatch.setenv("DEVELOPMENT", "true")
     monkeypatch.delenv("REBUILD_DUCKDB", raising=False)
     assert should_rebuild(db, parquet) is False
 
 
 def test_should_rebuild_dev_when_rebuild_forced(parquet_and_db, monkeypatch):
-    from src.db import should_rebuild
-
     parquet, db = parquet_and_db
     db.write_bytes(b"x")
-    time.sleep(0.01)
     parquet.touch()
+    now = time.time()
+    os.utime(db, (now, now))
+    os.utime(parquet, (now + 10, now + 10))
     monkeypatch.setenv("DEVELOPMENT", "true")
     monkeypatch.setenv("REBUILD_DUCKDB", "true")
     assert should_rebuild(db, parquet) is True