diff --git a/bindep.txt b/bindep.txt
index 8e60cc8f..1f190fd0 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -18,6 +18,13 @@ gcc-c++           [platform:rpm]
 git               [platform:rpm]
 libffi-devel      [platform:rpm]
 openssl-devel     [platform:rpm]
+
+libxml2-dev       [platform:dpkg platform:apk]
+libxml2-devel     [platform:rpm]
+libxslt-devel     [platform:rpm]
+libxslt1-dev      [platform:dpkg]
+libxslt-dev       [platform:apk]
+
 python-devel      [platform:rpm !platform:rhel-8 !platform:centos-8]
 python3-devel     [platform:rpm !platform:rhel-7 !platform:centos-7]
 PyYAML            [platform:rpm !platform:rhel-8 !platform:centos-8]
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 34051b33..c637ea1b 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -8,7 +8,7 @@ asn1crypto==0.24.0
 Babel==2.5.3
 bcrypt==3.1.4
 certifi==2018.1.18
-cffi==1.11.5
+cffi==1.14.0
 chardet==3.0.4
 cliff==2.11.0
 cmd2==0.8.1
@@ -30,7 +30,7 @@ fixtures==3.0.0
 flake8==2.5.5
 gitdb2==2.0.3
 GitPython==2.1.8
-greenlet==0.4.13
+greenlet==0.4.15
 hacking==0.11.0
 idna==2.6
 imagesize==1.0.0
@@ -42,7 +42,7 @@ jsonpointer==2.0
 jsonschema==2.6.0
 keystoneauth1==3.12.0
 linecache2==1.0.0
-MarkupSafe==1.0
+MarkupSafe==1.1.0
 mccabe==0.2.1
 mistral-lib==1.2.0
 monotonic==1.4
@@ -65,7 +65,7 @@ oslo.serialization==2.25.0
 oslo.utils==3.40.2
 oslotest==3.2.0
 packaging==17.1
-paramiko==2.4.1
+paramiko==2.7.1
 passlib==1.7.1
 pbr==3.1.1
 pep8==1.5.7
@@ -92,7 +92,7 @@ python-subunit==1.0.0
 python-swiftclient==3.5.0
 python-zaqarclient==1.9.0
 pytz==2018.3
-PyYAML==3.12
+PyYAML==3.13
 requests==2.18.4
 requestsexceptions==1.4.0
 rfc3986==1.1.0
diff --git a/requirements.txt b/requirements.txt
index 7a946be5..87449f58 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,5 @@
 
 pbr>=3.1.1 # Apache-2.0
 six>=1.11.0 # MIT
-PyYAML>=3.12 # MIT
+PyYAML>=3.13 # MIT
 ansible-runner>=1.3.4 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index eaa8652c..53edb204 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,10 @@
 # process, which may cause wedges in the gate later.
 
 hacking>=3.0,<3.1.0 # Apache-2.0
+# remove this pyflakes from here once you bump the
+# hacking to 3.2.0 or above. hacking 3.2.0 takes
+# care of pyflakes version compatibilty.
+pyflakes>=2.1.1
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD