diff --git a/tox.ini b/tox.ini
index 15dbaee8..97f3a210 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,6 +29,11 @@ changedir = docs
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees . _build/html
 
+[pytest]
+filterwarnings =
+    default::DeprecationWarning
+    error:.*:Warning:pelican
+
 [flake8]
 application-import-names = pelican
 import-order-style = cryptography