diff --git a/MANIFEST.in b/MANIFEST.in
index d916d74..c5f22c6 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,5 @@
 include README.rst
 include LICENSE
 include CHANGELOG.rst
-include tests/*.py
+recursive-include tests *
 include docs/source/*
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 1766364..8c52119 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -3,6 +3,5 @@ nose
 codecov
 coverage
 flake8
-six
 black;python_version>="3.6"
 isort;python_version>="3.6"