diff --git a/doc/requirements.txt b/doc/requirements.txt
index 999af220..b66933fa 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -14,5 +14,5 @@ betamax>=0.7.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 requests-mock>=1.2.0 # Apache-2.0
-lxml!=3.7.0,>=3.4.1 # BSD
+lxml>=4.2.0 # BSD
 oauthlib>=0.6.2 # BSD
diff --git a/lower-constraints.txt b/lower-constraints.txt
index ae007ee7..709122c1 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -1,62 +1,48 @@
-alabaster==0.7.10
 appdirs==1.4.3
+Babel==2.8.0
 bandit==1.1.0
 betamax==0.7.0
 certifi==2018.1.18
-chardet==3.0.4
-cliff==2.11.0
-cmd2==0.8.1
 coverage==4.0
 debtcollector==1.19.0
-docutils==0.14
 dulwich==0.19.0
+entrypoints==0.3
 extras==1.0.0
 fixtures==3.0.0
 future==0.16.0
 gitdb2==2.0.3
 GitPython==2.1.8
-idna==2.6
-imagesize==1.0.0
 iso8601==0.1.11
-Jinja2==2.10
 linecache2==1.0.0
-lxml==3.4.1
-MarkupSafe==1.0
-mccabe==0.2.1
+lxml==4.2.0
 mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 netaddr==0.7.19
 netifaces==0.10.6
 oauthlib==0.6.2
-openstack-requirements==1.2.0
 os-client-config==1.29.0
 os-service-types==1.2.0
 oslo.config==5.2.0
 oslo.i18n==3.20.0
 oslo.utils==3.33.0
 oslotest==3.2.0
-packaging==17.1
-Parsley==1.3
 pbr==2.0.0
 pep257==0.7.0
-prettytable==0.7.2
-Pygments==2.2.0
+pykerberos==1.2.1
 pyparsing==2.2.0
-pyperclip==1.6.0
 python-mimeparse==1.6.0
 python-subunit==1.2.0
 pytz==2018.3
 PyYAML==3.12
 reno==3.1.0
+requests==2.14.2
 requests-kerberos==0.8.0
 requests-mock==1.2.0
-requests==2.14.2
 requestsexceptions==1.4.0
 rfc3986==1.1.0
 six==1.10.0
 smmap2==2.0.3
-snowballstemmer==1.2.1
 stestr==1.0.0
 stevedore==1.20.0
 testrepository==0.0.20
@@ -65,5 +51,4 @@ testtools==2.2.0
 traceback2==1.4.0
 unittest2==1.1.0
 urllib3==1.22
-voluptuous==0.11.1
 wrapt==1.10.11
diff --git a/setup.cfg b/setup.cfg
index 903c16f8..2db885aa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,7 +30,7 @@ packages =
 kerberos =
   requests-kerberos>=0.8.0 # ISC
 saml2 =
-  lxml!=3.7.0,>=3.4.1 # BSD
+  lxml>=4.2.0 # BSD
 oauth1 =
   oauthlib>=0.6.2 # BSD
 betamax =
diff --git a/test-requirements.txt b/test-requirements.txt
index 2036d30f..bb35c198 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -21,5 +21,5 @@ testresources>=2.0.0 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 PyYAML>=3.12 # MIT
 requests-kerberos>=0.8.0 # ISC
-lxml!=3.7.0,>=3.4.1 # BSD
+lxml>=4.2.0 # BSD
 oauthlib>=0.6.2 # BSD