diff --git a/tox.ini b/tox.ini
index fcd8d24e..802a48fa 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,10 @@ setenv =
 passenv =
     *
 deps =
+    # Upgrade/pin pip/virtualenv for e.g. more-itertools to be handled properly.
     pip==19.2.1
+    virtualenv==16.7.2
+
     t310: pytest==3.10.1
     t40: pytest==4.0.2
     t41: pytest==4.1.1
@@ -27,8 +30,6 @@ deps =
     c44: coverage==4.4.2
     c45: coverage==4.5.3
 pip_pre = true
-# Upgrade e.g. virtualenv for e.g. more-itertools to be handled properly.
-install_command = python -m pip install -U {opts} {packages}
 commands =
     pytest {posargs:-vv}