diff --git a/pyproject.toml b/pyproject.toml
index a752b09d..edef39bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -98,3 +98,9 @@ reportExplicitAny = false
 allowedUntypedLibraries = ["langfuse"]
 reportImplicitOverride = false
 reportImportCycles = false
+
+[[tool.uv.index]]
+name = "testpypi"
+url = "https://test.pypi.org/simple/"
+publish-url = "https://test.pypi.org/legacy/"
+explicit = true
diff --git a/tests/bench/harness.py b/tests/bench/harness.py
index c4fbfa75..46819b29 100755
--- a/tests/bench/harness.py
+++ b/tests/bench/harness.py
@@ -552,14 +552,19 @@ except Exception as e:
             # Backup .env file to prevent it from overriding our environment variables
             self.backup_env_file()
 
-            # Copy .env file from tests/bench to the project root
+            # Copy .env file from tests/bench to the project root for FastAPI
             shutil.copy(
-                self.project_root / "tests" / "bench" / ".env", self.project_root
+                self.project_root / "tests" / "bench" / ".env",
+                self.project_root / ".env",
             )
 
             # Create temporary docker-compose.yml
             self.create_temp_docker_compose()
 
+            # Create an empty .env file in temp directory to satisfy docker-compose
+            # (even though the database service doesn't actually use it)
+            (self.temp_dir / ".env").touch()
+
             # Start database
             self.start_database()