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--- a/setup.py	2019-07-22 20:18:46.000000000 +0200
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+++ b/setup.py	2019-08-01 21:49:28.107607851 +0200
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@@ -238,7 +238,7 @@
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     install_requires=[
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         'six>=1.11.0',       # MIT license
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         'txaio>=18.8.1',     # MIT license
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-        'cryptography>=2.7', # BSD *or* Apache license
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+        'cryptography>=2.6.1', # BSD *or* Apache license
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     ],
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     extras_require={
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         'all': extras_require_all,