diff --git a/test-requirements.txt b/test-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.
+
+# Hacking already pins down pep8, pyflakes and flake8
+hacking<0.10,>=0.9.2