diff --git a/test/config_test.yaml b/test/config_test.yaml
index f05cce7..30f2fa3 100644
--- a/test/config_test.yaml
+++ b/test/config_test.yaml
@@ -10,6 +10,4 @@ api_keys:
   "http://192.168.0.51:12434": "ollama"
   "http://192.168.0.51:12434/v1": "llama"
 
-db_path: "/tmp/nomyo_test_tokens.db"
-
 cache_enabled: false
diff --git a/test/conftest.py b/test/conftest.py
index c95fa2d..c5142da 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -16,6 +16,7 @@ import asyncio
 import os
 import ssl
 import sys
+import tempfile
 from pathlib import Path
 from unittest.mock import MagicMock, patch
 
@@ -24,8 +25,14 @@ import httpx
 import pytest
 
 _TEST_DIR = Path(__file__).parent
-# Must be set before importing router so the module-level Config.from_yaml uses test config
+# Must be set before importing router so module-level Config.from_yaml + Config field
+# defaults pick these up. db_path is intentionally absent from config_test.yaml so the
+# env-var default wins — keeps tests portable across CI runners (Linux/macOS/Windows).
 os.environ.setdefault("NOMYO_ROUTER_CONFIG_PATH", str(_TEST_DIR / "config_test.yaml"))
+os.environ.setdefault(
+    "NOMYO_ROUTER_DB_PATH",
+    str(Path(tempfile.gettempdir()) / "nomyo_router_test_tokens.db"),
+)
 
 sys.path.insert(0, str(_TEST_DIR.parent))
 
diff --git a/test/test_cache.py b/test/test_cache.py
index cd37688..f2ce1a9 100644
--- a/test/test_cache.py
+++ b/test/test_cache.py
@@ -1,4 +1,6 @@
 """Unit tests for cache.LLMCache in exact-match mode (no sentence-transformers needed)."""
+import tempfile
+from pathlib import Path
 from types import SimpleNamespace
 
 import orjson
@@ -13,6 +15,8 @@ from cache import (
     openai_nonstream_to_sse,
 )
 
+_CACHE_DB_PATH = str(Path(tempfile.gettempdir()) / "nomyo_test_cache.db")
+
 
 def _exact_cfg(backend: str = "memory") -> SimpleNamespace:
     """Config for exact-match mode — similarity=1.0 avoids embedding deps."""
@@ -22,7 +26,7 @@ def _exact_cfg(backend: str = "memory") -> SimpleNamespace:
         cache_similarity=1.0,
         cache_history_weight=0.3,
         cache_ttl=300,
-        cache_db_path="/tmp/test_cache.db",
+        cache_db_path=_CACHE_DB_PATH,
         cache_redis_url="redis://localhost:6379",
     )