diff --git a/tests/conftest.py b/tests/conftest.py
index 92ad159..476c820 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -20,6 +20,8 @@
 
 import numpy as np
 
+import matplotlib
+
 import pytest
 
 # =============================================================================
@@ -74,6 +76,8 @@ def make(*, distribution="normal", **kwargs):
 # CONFIGURATIONS
 # =============================================================================
 
+matplotlib.use("agg")
+
 
 def pytest_configure():
     pytest.DISTRIBUTIONS = DISTRIBUTIONS