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diff --git a/setup.py b/setup.py
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index 8551821..741fc84 100644
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--- a/setup.py
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+++ b/setup.py
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@@ -14,7 +14,6 @@ install_requires = [
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     # 1.1.0+ is required to avoid the warnings described at
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     # https://github.com/certbot/josepy/issues/13.
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     'josepy>=1.1.0',
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-    'mock',
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     # Connection.set_tlsext_host_name (>=0.13)
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     'PyOpenSSL>=0.13.1',
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     'pyrfc3339',