diff --git a/MANIFEST.in b/MANIFEST.in
index 7c9b8985..14091974 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,6 @@
 include README.rst LICENSE AUTHORS.rst CHANGELOG pyproject.toml
 recursive-include tests *
+include requirements.txt tox.ini
 include freezegun/py.typed
 recursive-include freezegun *.pyi
 global-exclude __pycache__