diff --git a/tox.ini b/tox.ini
index 581148d..4e4efc5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,5 +7,6 @@ isolated_build = true
 deps = 
   xeger
   colorful
+  psutil
 commands = python unit_test.py
 allowlist_externals = poetry