diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9eddcfc..37b7d924 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - Add comprehensive test coverage for warning context managers (`ignore()` and `strict()`) ([#832](https://github.com/stac-utils/pystac-client/pull/832))
+- Moved -Werror to pyproject.toml ([#841](https://github.com/stac-utils/pystac-client/pull/841))
 
 ### Changed
 
diff --git a/pyproject.toml b/pyproject.toml
index 5ce2ce27..c78a2d22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -109,7 +109,7 @@ select = ["E", "F", "W", "I"]
 
 [tool.pytest.ini_options]
 markers = "vcr: records network activity"
-addopts = "--benchmark-skip --block-network"
+addopts = "--benchmark-skip --block-network -Werror"
 filterwarnings = [
     "ignore::ResourceWarning",
     "ignore::pytest.PytestUnraisableExceptionWarning",
diff --git a/scripts/test b/scripts/test
index 01e4a704..3c468629 100755
--- a/scripts/test
+++ b/scripts/test
@@ -20,7 +20,7 @@ if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
         ./scripts/lint
         ./scripts/format
         # Test suite with coverage enabled
-        pytest -Werror --cov pystac_client --cov-report term-missing
+        pytest --cov pystac_client --cov-report term-missing
         coverage xml
     fi
 fi
diff --git a/tests/test_warnings.py b/tests/test_warnings.py
index b878d628..2e0998fc 100644
--- a/tests/test_warnings.py
+++ b/tests/test_warnings.py
@@ -7,7 +7,6 @@
 
 
 class TestWarningContextManagers:
-    @pytest.mark.filterwarnings("error")
     def test_ignore_context_manager(self) -> None:
         """Test that ignore() context manager suppresses warnings."""
         api = Client.from_file(str(TEST_DATA / "planetary-computer-root.json"))
@@ -16,7 +15,6 @@ def test_ignore_context_manager(self) -> None:
         with ignore():
             api.collection_search(limit=10, max_collections=10, q="test")
 
-    @pytest.mark.filterwarnings("error")
     def test_strict_context_manager(self) -> None:
         """Test that strict() context manager converts warnings to exceptions."""
         api = Client.from_file(str(TEST_DATA / "planetary-computer-root.json"))