diff --git a/pyproject.toml b/pyproject.toml
index 3fa6f6c1..35f9aa5d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -85,6 +85,7 @@ norecursedirs = [
 doctest_plus = "enabled"
 addopts = "--doctest-rst"
 filterwarnings = [
+    "error",
     "ignore:Models in math_functions:astropy.utils.exceptions.AstropyUserWarning",
     "ignore:numpy.ndarray size changed:RuntimeWarning",
 ]