diff --git a/tox.ini b/tox.ini
index 9c73bc806..25d1ffccc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,7 @@ deps =
     pytest
     pytest-cov
     pytest-timeout
+    packaging
 changedir = {toxinidir}/tests
 markers = "not (integration or slow or stress)"