diff --git a/pyproject.toml b/pyproject.toml
index 0fb2b7b..4787f2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,8 @@ requires-python = ">= 3.11, < 4"
 # TODO(cookiecutter): Remove and add more dependencies if appropriate
 dependencies = [
   "click >= 8.1.8, < 9",
-  "entsoe-py >= 0.6.16, < 0.8.0",
+  # Stick to a version without a polluting `tests` package: https://github.com/EnergieID/entsoe-py/pull/447
+  "entsoe-py >= 0.6.16, < 0.7.1",
   "frequenz-api-common >= 0.6.5, < 0.9.0",
   "grpcio >= 1.72.1, < 2",
   "frequenz-channels >= 1.6.1, < 2",
diff --git a/src/frequenz/client/electricity_trading/cli/day_ahead.py b/src/frequenz/client/electricity_trading/cli/day_ahead.py
index 6d12c51..3cccb3f 100644
--- a/src/frequenz/client/electricity_trading/cli/day_ahead.py
+++ b/src/frequenz/client/electricity_trading/cli/day_ahead.py
@@ -6,7 +6,7 @@
 from datetime import datetime
 
 import pandas as pd
-from entsoe import EntsoePandasClient  # type: ignore[attr-defined]
+from entsoe import EntsoePandasClient
 
 
 def list_day_ahead_prices(
diff --git a/tests/__init__.py b/tests/__init__.py
deleted file mode 100644
index f0b67fe..0000000
--- a/tests/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-# License: Proprietary
-# Copyright © 2025 Frequenz Energy-as-a-Service GmbH
-
-"""Tests for Electricity Trading API client."""