Make Certbot depend on josepy
diff --git a/setup.py b/setup.py
index ce505a62ef4..47b5b0b2cde 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ def read_file(filename, encoding='utf8'):
     'ConfigArgParse>=0.9.3',
     'configobj',
     'cryptography>=1.2',  # load_pem_x509_certificate
+    'josepy',
     'mock',
     'parsedatetime>=1.3',  # Calendar.parseDT
     'pyrfc3339',

Fixes #5519.