diff --git a/test-requirements.txt b/test-requirements.txt
index a77df98cc6..1b61400ebf 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,9 @@
 # process, which may cause wedges in the gate later.
 pbr>=2.0 # Apache-2.0
 
+# chardet 3.0.0 and 3.0.1 are broken, blacklist them.
+chardet!=3.0.1,!=3.0.0
+
 # Hacking already pins down pep8, pyflakes and flake8
 hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0