diff --git a/pyproject.toml b/pyproject.toml
index d85e08da..643f7089 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ aind_behavior_services = ["py.typed"]
 
 [tool.setuptools.dynamic]
 version = {attr = "aind_behavior_services.__version__"}
-readme = {file = ["README.md"]}
+readme = {file = "README.md", content-type = "text/markdown"}
 
 [tool.ruff]
 line-length = 120