diff --git a/tox.ini b/tox.ini
index 6901f8e92..cc9eadf1d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -61,8 +61,6 @@ commands =
     python setup.py build_sphinx
 
 [testenv:releasenotes]
-# Note: remove once infra supports constraints for this target
-install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
@@ -70,10 +68,6 @@ commands =
 [testenv:cover]
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
-# NOTE(sdague): this target does not use constraints because
-# upstream infra does not yet support it. Once that's fixed, we can
-# drop the install_command.
-install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
   coverage erase
   python setup.py testr --coverage --testr-args='{posargs}'
@@ -81,8 +75,6 @@ commands =
   coverage html --include='tacker/*' -d covhtml -i
 
 [testenv:venv]
-# Note: remove once infra supports constraints for this target
-install_command = pip install -U --force-reinstall {opts} {packages}
 commands = {posargs}
 
 [flake8]