diff --git a/tox.ini b/tox.ini
index 04ff811eb..3aee41cc0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,6 @@ commands =
 
 #set PYTHONHASHSEED=0 to prevent wsmeext.sphinxext from randomly failing.
 [testenv:venv]
-install_command = pip install -U {opts} {packages}
 setenv = PYTHONHASHSEED=0
 commands = {posargs}
 
@@ -54,9 +53,6 @@ setenv = VIRTUAL_ENV={envdir}
 commands = bash tools/lintstack.sh
 
 [testenv:releasenotes]
-# TODO(kong): Avoid 'Couldn't open file...upper-constraints.txt' error. Remove
-# this line once infra supports constraints for this target.
-install_command = pip install -U {opts} {packages}
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 #Skip PEP257 violation.