diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..1eeef06
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+prune tests
diff --git a/pyproject.toml b/pyproject.toml
index 497be87..cd48352 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ tests = [
 packages = ["django_group_role"]
 
 [tool.setuptools.dynamic]
-readme = {file = ["README.md"]}
+readme = {file = ["README.md"], content-type = "text/markdown; charset=UTF-8; variant=GFM"}
 
 [tool.coverage.run]
 omit = [