diff --git a/pyproject.toml b/pyproject.toml
index 326495c..737724b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -101,7 +101,7 @@ expected-line-ending-format = "LF"
 
 [tool.pyrefly]
 min-severity = "warn"
-project-excludes = ["*.ipynb"]
+project-includes = ["**/*.py"]
 
 [tool.ruff]
 extend-exclude = ["*.ipynb"]