diff --git a/pyproject.toml b/pyproject.toml
index 07254ec..c7ef2d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ authors = [
   "Sri Hari Krishna Narayanan <snarayan@anl.gov>",
   "Michael A. Perlin <mika.perlin@gmail.com>",
 ]
-readme = "README.md"
+readme = "README.rst"
 license = "Apache-2.0"
 repository = "https://github.com/jmlarson1/QFI-Opt"
 keywords = ["quantum fisher information", "QFI", "quantum metrology"]