diff --git a/lower-constraints.txt b/lower-constraints.txt
index b04a89565..bfa256786 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -7,7 +7,7 @@ certifi==2018.1.18
 cffi==1.11.5
 chardet==3.0.4
 coverage==4.0
-cryptography==2.1.4
+cryptography==2.2.1
 debtcollector==1.19.0
 doc8==0.6.0
 docutils==0.14
diff --git a/tox.ini b/tox.ini
index 3ef55c0e7..2fc920f19 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,6 @@ ignore_basepython_conflict=true
 [testenv]
 basepython = python3
 usedevelop = True
-install_command = pip install -U {opts} {packages}
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHONWARNINGS=default::DeprecationWarning