diff --git a/tox.ini b/tox.ini
index 9276f68324..6acf3a3457 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,16 +18,6 @@ whitelist_externals =
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY PBR_VERSION
 
 [testenv:api-ref]
-# This environment is called from CI scripts to test and publish
-# the API Ref to developer.openstack.org.
-# 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.
-#
-# we do not used -W here because we are doing some slightly tricky
-# things to build a single page document, and as such, we are ok
-# ignoring the duplicate stanzas warning.
-install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
   rm -rf api-ref/build
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
@@ -80,10 +70,6 @@ commands =
   bash tools/cover.sh
 
 [testenv:venv]
-# NOTE(jaegerandi): 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 = {posargs}
 
 [testenv:debug]
@@ -148,10 +134,6 @@ commands=
     python setup.py build_sphinx
 
 [testenv:releasenotes]
-# 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 = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:genconfig]