diff --git a/noxfile.py b/noxfile.py
index e05b9e3..2775411 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -4,6 +4,7 @@
 @nox.session
 def tests(session):
     session.install("pytest")
+    session.install(".")
     session.run("pytest")