diff --git a/MANIFEST.in b/MANIFEST.in
index e9a430a..21ab55c 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,6 @@
 include README.md
 include LICENSE.txt
+include pyproject.toml
 recursive-include tests *
 global-exclude __pycache__
 global-exclude *.pyc