diff --git a/requirements.txt b/requirements.txt
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+# 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.
+
+pbr<2.0,>=1.4
+Babel>=1.3
+# tempest>=6.0.0
+oslo.config>=2.3.0
+boto>=2.32.1
+oslo.log>=1.8.0 # Apache-2.0
+six>=1.9.0
+tempest>=10.0.0