diff --git a/tests/conftest.py b/tests/conftest.py
index d0c30c2..22b5e42 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -35,7 +35,7 @@ from mempalace.knowledge_graph import KnowledgeGraph  # noqa: E402
 
 
 @pytest.fixture(scope="session", autouse=True)
-def _isolate_home(tmp_path_factory):
+def _isolate_home():
     """Ensure HOME points to a temp dir for the entire test session.
 
     The env vars were already set at module level (above) so that
diff --git a/tests/test_dialect.py b/tests/test_dialect.py
index 2ef1df6..8edc7ec 100644
--- a/tests/test_dialect.py
+++ b/tests/test_dialect.py
@@ -109,11 +109,11 @@ class TestCompressionStats:
         original = "We decided to use GraphQL instead of REST. " * 10
         compressed = d.compress(original)
         stats = d.compression_stats(original, compressed)
-        assert stats["ratio"] > 1
-        assert stats["original_chars"] > stats["compressed_chars"]
+        assert stats["size_ratio"] > 1
+        assert stats["original_chars"] > stats["summary_chars"]
 
     def test_count_tokens(self):
-        assert Dialect.count_tokens("hello world") == len("hello world") // 3
+        assert Dialect.count_tokens("hello world") == 2
 
 
 class TestZettelEncoding: