diff --git a/bindep.txt b/bindep.txt
index 92184a6529..32ab369f0c 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -5,3 +5,6 @@ build-essential [platform:dpkg]
 libffi-dev [platform:dpkg]
 gettext [platform:dpkg]
 python37 [platform:rpm py37]
+
+# PDF Docs package dependencies
+tex-gyre [platform:dpkg doc]
diff --git a/lower-constraints.txt b/lower-constraints.txt
index faf2243e1f..b318df1721 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -19,10 +19,11 @@ oslo.config==5.2.0
 oslo.i18n==3.15.3
 oslo.log==3.36.0
 oslo.messaging==8.0.0
-oslo.messaging[kafka]==8.0.0
+oslo.messaging==8.0.0
 oslo.privsep==1.32.0
 oslo.reports==1.18.0
 oslo.rootwrap==2.0.0
+oslo.upgradecheck==0.1.1
 oslo.utils==3.37.0
 oslo.vmware==2.17.0
 oslotest==3.2.0
@@ -38,12 +39,12 @@ python-novaclient==9.1.0
 python-swiftclient==3.2.0
 python-zaqarclient==1.3.0
 PyYAML==3.13
-requests==2.8.1
+requests==2.14.2
 requests-aws==0.1.4
-six==1.9.0
+six==1.10.0
 stestr==2.0.0
 stevedore==1.20.0
 tenacity==4.12.0
 testscenarios==0.4
 testtools==2.2.0
-tooz[zake]==1.47.0
+tooz==1.47.0
diff --git a/requirements.txt b/requirements.txt
index 66dcb18950..06179a8972 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,8 +28,8 @@ python-novaclient>=9.1.0 # Apache-2.0
 python-swiftclient>=3.2.0 # Apache-2.0
 python-cinderclient>=3.3.0  # Apache-2.0
 PyYAML>=3.13 # MIT
-requests!=2.9.0,>=2.8.1 # Apache-2.0
-six>=1.9.0 # MIT
+requests>=2.14.2 # Apache-2.0
+six>=1.10.0 # MIT
 stevedore>=1.20.0 # Apache-2.0
 tenacity>=4.12.0  # Apache-2.0
 tooz[zake]>=1.47.0 # Apache-2.0