diff --git a/pytest.ini b/pytest.ini
index 39a29fe..bbe2275 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,3 +1,9 @@
 [pytest]
 norecursedirs = .git .* *.egg* old docs dist build
 addopts = -rw
+filterwarnings =
+    error
+    # python2.x `configparser` warns about native string but it works fine
+    ignore:You passed a bytestring as `filenames`.*:DeprecationWarning
+    # python3.4 raises this when importing setuptools
+    ignore:The value of convert_charrefs will become True in 3.5.*:DeprecationWarning