diff --git a/requirements-py3.txt b/requirements-py3.txt
index dd838b45..8b2aef5f 100644
--- a/requirements-py3.txt
+++ b/requirements-py3.txt
@@ -1,11 +1,14 @@
-eventlet>=0.16.1
-six>=1.7.0
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+eventlet>=0.16.1,!=0.17.0
+six>=1.9.0
 Babel>=1.3
-oslo.concurrency>=1.4.1         # Apache-2.0
-oslo.context>=0.1.0                     # Apache-2.0
-oslo.messaging>=1.4.0,!=1.5.0
-oslo.serialization>=1.2.0               # Apache-2.0
-oslo.utils>=1.2.0                       # Apache-2.0
+oslo.concurrency>=1.8.0,<1.9.0         # Apache-2.0
+oslo.context>=0.2.0,<0.3.0                     # Apache-2.0
+oslo.messaging>=1.8.0,<1.9.0  # Apache-2.0
+oslo.serialization>=1.4.0,<1.5.0               # Apache-2.0
+oslo.utils>=1.4.0,<1.5.0                       # Apache-2.0
 iso8601>=0.1.9
-oslo.log>=0.1.0
-oslo.i18n>=1.3.0  # Apache-2.0
+oslo.log>=1.0.0,<1.1.0  # Apache-2.0
+oslo.i18n>=1.5.0,<1.6.0  # Apache-2.0
diff --git a/requirements.txt b/requirements.txt
index 87ccf48d..f485fb42 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,15 @@
-six>=1.7.0
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+six>=1.9.0
 Babel>=1.3
-oslo.concurrency>=1.4.1         # Apache-2.0
-oslo.context>=0.1.0                     # Apache-2.0
-oslo.messaging>=1.4.0,!=1.5.0
-oslo.serialization>=1.2.0               # Apache-2.0
-oslo.utils>=1.2.0                       # Apache-2.0
+oslo.concurrency>=1.8.0,<1.9.0         # Apache-2.0
+oslo.context>=0.2.0,<0.3.0                     # Apache-2.0
+oslo.messaging>=1.8.0,<1.9.0  # Apache-2.0
+oslo.serialization>=1.4.0,<1.5.0               # Apache-2.0
+oslo.utils>=1.4.0,<1.5.0                       # Apache-2.0
 iso8601>=0.1.9
-oslo.log>=0.1.0
-oslo.i18n>=1.3.0  # Apache-2.0
+oslo.log>=1.0.0,<1.1.0  # Apache-2.0
+oslo.i18n>=1.5.0,<1.6.0  # Apache-2.0
 mock>=1.0
 fixtures>=0.3.14
diff --git a/test-requirements.txt b/test-requirements.txt
index 89153084..a8d0e615 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,9 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
 hacking>=0.5.6,<0.8
-oslotest>=1.2.0  # Apache-2.0
+oslotest>=1.5.1,<1.6.0  # Apache-2.0
 testtools>=0.9.36,!=1.2.0
 # These are needed for docs generation
-oslosphinx>=2.2.0  # Apache-2.0
+oslosphinx>=2.5.0,<2.6.0  # Apache-2.0
 sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3