diff --git a/pyproject.toml b/pyproject.toml
index dbb1af5..d672ca2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,8 @@ name = "google-yamlfmt"
 version = "0.21.0"
 description = "A tool for formatting YAML files, yamlfmt from Google: https://github.com/google/yamlfmt"
 readme = "README.md"
-license = { text = "MIT" }
+license = "MIT"
+license-files = ["LICENSE"]
 requires-python = ">=3.9"
 dependencies = []