diff --git a/pyproject.toml b/pyproject.toml
index 18127bc9..a936af78 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,3 +22,6 @@ version = "1.8.0"
 description = "A python wrapper of the C library 'Google CRC32C'"
 readme = "README.md"
 requires-python = ">=3.9"
+
+[project.optional-dependencies]
+testing = ["pytest"]
diff --git a/setup.cfg b/setup.cfg
index ed5c0556..e1c889a8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -39,10 +39,3 @@ classifiers =
 [options]
 zip_safe = True
 python_requires = >=3.9
-
-[options.extras_require]
-testing = pytest
-
-[options.package_data]
-google_crc32c =
-    py.typed