diff --git a/lower-constraints.txt b/lower-constraints.txt
index bbd51a190..b44bc8296 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -7,25 +7,25 @@ certifi==2018.1.18
 chardet==3.0.4
 cliff==2.11.0
 cmd2==0.8.1
-coverage==4.5.1
+coverage==4.0
 debtcollector==1.19.0
-doc8==0.8.0
+doc8==0.6.0
 docutils==0.14
 dulwich==0.19.0
 enum-compat==0.0.2
-eventlet==0.20.0
+eventlet==0.18.2
 extras==1.0.0
 fasteners==0.14.1
 fixtures==3.0.0
+flake8-import-order==0.13
 flake8==2.5.5
-flake8-import-order==0.17.1
 future==0.16.0
 greenlet==0.4.13
 hacking==1.0.0
 idna==2.6
 imagesize==1.0.0
-ironic-lib==2.12.0
-iso8601==0.1.12
+ironic-lib==2.5.0
+iso8601==0.1.11
 Jinja2==2.10
 keystoneauth1==3.4.0
 linecache2==1.0.0
@@ -37,28 +37,28 @@ mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
-netaddr==0.7.19
-netifaces==0.10.6
-openstackdocstheme==1.20.0
+netaddr==0.7.18
+netifaces==0.10.4
+openstackdocstheme==1.18.1
 os-client-config==1.29.0
 os-testr==1.0.0
 oslo.concurrency==3.26.0
 oslo.config==5.2.0
 oslo.context==2.20.0
 oslo.i18n==3.20.0
-oslo.log==3.37.0
-oslo.serialization==2.25.0
-oslo.service==1.30.0
-oslo.utils==3.36.0
-oslotest==3.3.0
+oslo.log==3.36.0
+oslo.serialization==2.18.0
+oslo.service==1.24.0
+oslo.utils==3.33.0
+oslotest==3.2.0
 Paste==2.0.3
 PasteDeploy==1.5.2
-pbr==3.1.1
-pecan==1.2.1
+pbr==2.0.0
+pecan==1.0.0
 pep8==1.5.7
-Pint==0.8.1
+Pint==0.5
 prettytable==0.7.2
-psutil==5.4.3
+psutil==3.2.2
 pycodestyle==2.3.1
 pyflakes==0.8.1
 Pygments==2.2.0
@@ -69,27 +69,27 @@ python-dateutil==2.7.0
 python-mimeparse==1.6.0
 python-subunit==1.2.0
 pytz==2018.3
-pyudev==0.21.0
+pyudev==0.16.1
 PyYAML==3.12
-reno==2.7.0
+reno==2.5.0
 repoze.lru==0.7
-requests==2.18.4
+requests==2.14.2
 requestsexceptions==1.4.0
 restructuredtext-lint==1.1.3
 rfc3986==1.1.0
 Routes==2.4.1
-rtslib-fb==2.1.66
+rtslib-fb==2.1.43
 simplegeneric==0.8.1
-six==1.11.0
+six==1.10.0
 snowballstemmer==1.2.1
-Sphinx==1.6.5
+Sphinx==1.6.2
 sphinxcontrib-httpdomain==1.6.1
 sphinxcontrib-pecanwsme==0.8.0
 sphinxcontrib-websupport==1.0.1
 stestr==2.0.0
-stevedore==1.28.0
+stevedore==1.20.0
 testrepository==0.0.20
-testtools==2.3.0
+testtools==2.2.0
 traceback2==1.4.0
 unittest2==1.1.0
 urllib3==1.22
@@ -98,4 +98,4 @@ waitress==1.1.0
 WebOb==1.7.4
 WebTest==2.0.29
 wrapt==1.10.11
-WSME==0.9.2
+WSME==0.8.0
diff --git a/requirements.txt b/requirements.txt
index ae5dde357..431d1760e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
+eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 iso8601>=0.1.11 # MIT
 netaddr>=0.7.18 # BSD
 netifaces>=0.10.4 # MIT