diff --git a/test-requirements.txt b/test-requirements.txt
index e20cec56..9f2d62de 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 bashate>=0.2 # Apache-2.0
 flake8<2.6.0,>=2.5.4 # MIT
-pyasn1 # BSD
+pyasn1!=0.2.3 # BSD
 pyOpenSSL>=0.14 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 ndg-httpsclient>=0.4.2;python_version<'3.0' # BSD