diff --git a/tox.ini b/tox.ini
index a44e1b4e..ccbd40f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ deps =
 whitelist_externals = bash
                       find
                       rm
-install_command = pip install -U {opts} {packages}
+install_command = pip install {opts} {packages}
 commands =
   find . -type f -name "*.pyc" -delete
   rm -Rf .testrepository/times.dbm