diff --git a/tox.ini b/tox.ini
index 272eb5f..b6a7d3c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@
 
 [tox]
 envlist = py36, py37, py38, py39, mypy
+isolated_build = True
 
 [gh-actions]
 python =
@@ -22,6 +23,8 @@ deps =
     pytest-cov
 setenv=
     PYTHONWARNINGS=all
+# will install the project
+usedevelop=True
 commands = pytest
 
 [pytest]