diff --git a/pyproject.toml b/pyproject.toml
index b514f2f..88ab9b1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ dev = [
 
 # https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#dynamic-metadata
 [tool.setuptools.dynamic]
-readme = {file = ["README.md", ]}
+readme = {file = "README.md", content-type = "text/markdown"}
 
 [project.urls]
 "Homepage" = "https://github.com/urbanopt/urbanopt-ditto-reader"