Replace platform.linux_distribution with distro.linux_distribution (#7337)

Smallest possible fix for #7106 

* Replace platform.linux_dependencies with distro.linux_dependencies

* run build.py

* Add minimum version of 1.0.1

* Pin back requests package

* Update changelog

8 files changed, 192 insertions, 178 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb051a22d..13e621ae7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 * If Certbot fails to rollback your server configuration, the error message
   links to the Let's Encrypt forum. Change the link to the Help category now
   that the Server category has been closed.
+* Replace platform.linux_distribution with distro.linux_distribution as a step
+  towards Python 3.8 support in Certbot.
 
 ### Fixed
 
diff --git a/certbot/tests/util_test.py b/certbot/tests/util_test.py
index cf4f31647..0ed6511f3 100644
--- a/certbot/tests/util_test.py
+++ b/certbot/tests/util_test.py
@@ -520,11 +520,11 @@ class OsInfoTest(unittest.TestCase):
 
             with mock.patch('platform.system_alias',
                             return_value=('linux', '', '')):
-                with mock.patch('platform.linux_distribution',
+                with mock.patch('distro.linux_distribution',
                                 return_value=('', '', '')):
                     self.assertEqual(get_python_os_info(), ("linux", ""))
 
-                with mock.patch('platform.linux_distribution',
+                with mock.patch('distro.linux_distribution',
                                 return_value=('testdist', '42', '')):
                     self.assertEqual(get_python_os_info(), ("testdist", "42"))
 
diff --git a/certbot/util.py b/certbot/util.py
index d3297507e..7d82eca8c 100644
--- a/certbot/util.py
+++ b/certbot/util.py
@@ -14,6 +14,7 @@ import socket
 import subprocess
 
 import configargparse
+import distro
 import six
 
 from acme.magic_typing import Tuple, Union  # pylint: disable=unused-import, no-name-in-module
@@ -391,8 +392,8 @@ def get_python_os_info():
     os_type, os_ver, _ = info
     os_type = os_type.lower()
     if os_type.startswith('linux'):
-        info = platform.linux_distribution()
-        # On arch, platform.linux_distribution() is reportedly ('','',''),
+        info = distro.linux_distribution()
+        # On arch, distro.linux_distribution() is reportedly ('','',''),
         # so handle it defensively
         if info[0]:
             os_type = info[0]
diff --git a/letsencrypt-auto-source/letsencrypt-auto b/letsencrypt-auto-source/letsencrypt-auto
index 5e65c2619..af2228ff4 100755
--- a/letsencrypt-auto-source/letsencrypt-auto
+++ b/letsencrypt-auto-source/letsencrypt-auto
@@ -1134,73 +1134,76 @@ if [ "$1" = "--le-auto-phase2" ]; then
 # To generate this, do (with docker and package hashin installed):
 # ```
 # letsencrypt-auto-source/rebuild_dependencies.py \
-#   letsencrypt-auto-sources/pieces/dependency-requirements.txt
+#   letsencrypt-auto-source/pieces/dependency-requirements.txt
+# ```
+# If you want to update a single dependency, run commands similar to these:
+# ```
+# pip install hashin
+# hashin -r dependency-requirements.txt cryptography==1.5.2
 # ```
 ConfigArgParse==0.14.0 \
     --hash=sha256:2e2efe2be3f90577aca9415e32cb629aa2ecd92078adbe27b53a03e53ff12e91
 asn1crypto==0.24.0 \
     --hash=sha256:2f1adbb7546ed199e3c90ef23ec95c5cf3585bac7d11fb7eb562a3fe89c64e87 \
     --hash=sha256:9d5c20441baf0cb60a4ac34cc447c6c189024b6b4c6cd7877034f4965c464e49
-certifi==2019.3.9 \
-    --hash=sha256:59b7658e26ca9c7339e00f8f4636cdfe59d34fa37b9b04f6f9e9926b3cece1a5 \
-    --hash=sha256:b26104d6835d1f5e49452a26eb2ff87fe7090b89dfcaee5ea2212697e1e1d7ae
-cffi==1.12.2 \
-    --hash=sha256:00b97afa72c233495560a0793cdc86c2571721b4271c0667addc83c417f3d90f \
-    --hash=sha256:0ba1b0c90f2124459f6966a10c03794082a2f3985cd699d7d63c4a8dae113e11 \
-    --hash=sha256:0bffb69da295a4fc3349f2ec7cbe16b8ba057b0a593a92cbe8396e535244ee9d \
-    --hash=sha256:21469a2b1082088d11ccd79dd84157ba42d940064abbfa59cf5f024c19cf4891 \
-    --hash=sha256:2e4812f7fa984bf1ab253a40f1f4391b604f7fc424a3e21f7de542a7f8f7aedf \
-    --hash=sha256:2eac2cdd07b9049dd4e68449b90d3ef1adc7c759463af5beb53a84f1db62e36c \
-    --hash=sha256:2f9089979d7456c74d21303c7851f158833d48fb265876923edcb2d0194104ed \
-    --hash=sha256:3dd13feff00bddb0bd2d650cdb7338f815c1789a91a6f68fdc00e5c5ed40329b \
-    --hash=sha256:4065c32b52f4b142f417af6f33a5024edc1336aa845b9d5a8d86071f6fcaac5a \
-    --hash=sha256:51a4ba1256e9003a3acf508e3b4f4661bebd015b8180cc31849da222426ef585 \
-    --hash=sha256:59888faac06403767c0cf8cfb3f4a777b2939b1fbd9f729299b5384f097f05ea \
-    --hash=sha256:59c87886640574d8b14910840327f5cd15954e26ed0bbd4e7cef95fa5aef218f \
-    --hash=sha256:610fc7d6db6c56a244c2701575f6851461753c60f73f2de89c79bbf1cc807f33 \
-    --hash=sha256:70aeadeecb281ea901bf4230c6222af0248c41044d6f57401a614ea59d96d145 \
-    --hash=sha256:71e1296d5e66c59cd2c0f2d72dc476d42afe02aeddc833d8e05630a0551dad7a \
-    --hash=sha256:8fc7a49b440ea752cfdf1d51a586fd08d395ff7a5d555dc69e84b1939f7ddee3 \
-    --hash=sha256:9b5c2afd2d6e3771d516045a6cfa11a8da9a60e3d128746a7fe9ab36dfe7221f \
-    --hash=sha256:9c759051ebcb244d9d55ee791259ddd158188d15adee3c152502d3b69005e6bd \
-    --hash=sha256:b4d1011fec5ec12aa7cc10c05a2f2f12dfa0adfe958e56ae38dc140614035804 \
-    --hash=sha256:b4f1d6332339ecc61275bebd1f7b674098a66fea11a00c84d1c58851e618dc0d \
-    --hash=sha256:c030cda3dc8e62b814831faa4eb93dd9a46498af8cd1d5c178c2de856972fd92 \
-    --hash=sha256:c2e1f2012e56d61390c0e668c20c4fb0ae667c44d6f6a2eeea5d7148dcd3df9f \
-    --hash=sha256:c37c77d6562074452120fc6c02ad86ec928f5710fbc435a181d69334b4de1d84 \
-    --hash=sha256:c8149780c60f8fd02752d0429246088c6c04e234b895c4a42e1ea9b4de8d27fb \
-    --hash=sha256:cbeeef1dc3c4299bd746b774f019de9e4672f7cc666c777cd5b409f0b746dac7 \
-    --hash=sha256:e113878a446c6228669144ae8a56e268c91b7f1fafae927adc4879d9849e0ea7 \
-    --hash=sha256:e21162bf941b85c0cda08224dade5def9360f53b09f9f259adb85fc7dd0e7b35 \
-    --hash=sha256:fb6934ef4744becbda3143d30c6604718871495a5e36c408431bf33d9c146889
+certifi==2019.6.16 \
+    --hash=sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939 \
+    --hash=sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695
+cffi==1.12.3 \
+    --hash=sha256:041c81822e9f84b1d9c401182e174996f0bae9991f33725d059b771744290774 \
+    --hash=sha256:046ef9a22f5d3eed06334d01b1e836977eeef500d9b78e9ef693f9380ad0b83d \
+    --hash=sha256:066bc4c7895c91812eff46f4b1c285220947d4aa46fa0a2651ff85f2afae9c90 \
+    --hash=sha256:066c7ff148ae33040c01058662d6752fd73fbc8e64787229ea8498c7d7f4041b \
+    --hash=sha256:2444d0c61f03dcd26dbf7600cf64354376ee579acad77aef459e34efcb438c63 \
+    --hash=sha256:300832850b8f7967e278870c5d51e3819b9aad8f0a2c8dbe39ab11f119237f45 \
+    --hash=sha256:34c77afe85b6b9e967bd8154e3855e847b70ca42043db6ad17f26899a3df1b25 \
+    --hash=sha256:46de5fa00f7ac09f020729148ff632819649b3e05a007d286242c4882f7b1dc3 \
+    --hash=sha256:4aa8ee7ba27c472d429b980c51e714a24f47ca296d53f4d7868075b175866f4b \
+    --hash=sha256:4d0004eb4351e35ed950c14c11e734182591465a33e960a4ab5e8d4f04d72647 \
+    --hash=sha256:4e3d3f31a1e202b0f5a35ba3bc4eb41e2fc2b11c1eff38b362de710bcffb5016 \
+    --hash=sha256:50bec6d35e6b1aaeb17f7c4e2b9374ebf95a8975d57863546fa83e8d31bdb8c4 \
+    --hash=sha256:55cad9a6df1e2a1d62063f79d0881a414a906a6962bc160ac968cc03ed3efcfb \
+    --hash=sha256:5662ad4e4e84f1eaa8efce5da695c5d2e229c563f9d5ce5b0113f71321bcf753 \
+    --hash=sha256:59b4dc008f98fc6ee2bb4fd7fc786a8d70000d058c2bbe2698275bc53a8d3fa7 \
+    --hash=sha256:73e1ffefe05e4ccd7bcea61af76f36077b914f92b76f95ccf00b0c1b9186f3f9 \
+    --hash=sha256:a1f0fd46eba2d71ce1589f7e50a9e2ffaeb739fb2c11e8192aa2b45d5f6cc41f \
+    --hash=sha256:a2e85dc204556657661051ff4bab75a84e968669765c8a2cd425918699c3d0e8 \
+    --hash=sha256:a5457d47dfff24882a21492e5815f891c0ca35fefae8aa742c6c263dac16ef1f \
+    --hash=sha256:a8dccd61d52a8dae4a825cdbb7735da530179fea472903eb871a5513b5abbfdc \
+    --hash=sha256:ae61af521ed676cf16ae94f30fe202781a38d7178b6b4ab622e4eec8cefaff42 \
+    --hash=sha256:b012a5edb48288f77a63dba0840c92d0504aa215612da4541b7b42d849bc83a3 \
+    --hash=sha256:d2c5cfa536227f57f97c92ac30c8109688ace8fa4ac086d19d0af47d134e2909 \
+    --hash=sha256:d42b5796e20aacc9d15e66befb7a345454eef794fdb0737d1af593447c6c8f45 \
+    --hash=sha256:dee54f5d30d775f525894d67b1495625dd9322945e7fee00731952e0368ff42d \
+    --hash=sha256:e070535507bd6aa07124258171be2ee8dfc19119c28ca94c9dfb7efd23564512 \
+    --hash=sha256:e1ff2748c84d97b065cc95429814cdba39bcbd77c9c85c89344b317dc0d9cbff \
+    --hash=sha256:ed851c75d1e0e043cbf5ca9a8e1b13c4c90f3fbd863dacb01c0808e2b5204201
 chardet==3.0.4 \
     --hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae \
     --hash=sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691
 configobj==5.0.6 \
     --hash=sha256:a2f5650770e1c87fb335af19a9b7eb73fc05ccf22144eb68db7d00cd2bcb0902
-cryptography==2.6.1 \
-    --hash=sha256:066f815f1fe46020877c5983a7e747ae140f517f1b09030ec098503575265ce1 \
-    --hash=sha256:210210d9df0afba9e000636e97810117dc55b7157c903a55716bb73e3ae07705 \
-    --hash=sha256:26c821cbeb683facb966045e2064303029d572a87ee69ca5a1bf54bf55f93ca6 \
-    --hash=sha256:2afb83308dc5c5255149ff7d3fb9964f7c9ee3d59b603ec18ccf5b0a8852e2b1 \
-    --hash=sha256:2db34e5c45988f36f7a08a7ab2b69638994a8923853dec2d4af121f689c66dc8 \
-    --hash=sha256:409c4653e0f719fa78febcb71ac417076ae5e20160aec7270c91d009837b9151 \
-    --hash=sha256:45a4f4cf4f4e6a55c8128f8b76b4c057027b27d4c67e3fe157fa02f27e37830d \
-    --hash=sha256:48eab46ef38faf1031e58dfcc9c3e71756a1108f4c9c966150b605d4a1a7f659 \
-    --hash=sha256:6b9e0ae298ab20d371fc26e2129fd683cfc0cfde4d157c6341722de645146537 \
-    --hash=sha256:6c4778afe50f413707f604828c1ad1ff81fadf6c110cb669579dea7e2e98a75e \
-    --hash=sha256:8c33fb99025d353c9520141f8bc989c2134a1f76bac6369cea060812f5b5c2bb \
-    --hash=sha256:9873a1760a274b620a135054b756f9f218fa61ca030e42df31b409f0fb738b6c \
-    --hash=sha256:9b069768c627f3f5623b1cbd3248c5e7e92aec62f4c98827059eed7053138cc9 \
-    --hash=sha256:9e4ce27a507e4886efbd3c32d120db5089b906979a4debf1d5939ec01b9dd6c5 \
-    --hash=sha256:acb424eaca214cb08735f1a744eceb97d014de6530c1ea23beb86d9c6f13c2ad \
-    --hash=sha256:c8181c7d77388fe26ab8418bb088b1a1ef5fde058c6926790c8a0a3d94075a4a \
-    --hash=sha256:d4afbb0840f489b60f5a580a41a1b9c3622e08ecb5eec8614d4fb4cd914c4460 \
-    --hash=sha256:d9ed28030797c00f4bc43c86bf819266c76a5ea61d006cd4078a93ebf7da6bfd \
-    --hash=sha256:e603aa7bb52e4e8ed4119a58a03b60323918467ef209e6ff9db3ac382e5cf2c6
-# Package enum34 needs to be explicitly limited to Python2.x, in order to avoid
-# certbot-auto failures on Python 3.6+ which enum34 doesn't support. See #5456.
-enum34==1.1.6 ; python_version < '3.4' \
+cryptography==2.7 \
+    --hash=sha256:24b61e5fcb506424d3ec4e18bca995833839bf13c59fc43e530e488f28d46b8c \
+    --hash=sha256:25dd1581a183e9e7a806fe0543f485103232f940fcfc301db65e630512cce643 \
+    --hash=sha256:3452bba7c21c69f2df772762be0066c7ed5dc65df494a1d53a58b683a83e1216 \
+    --hash=sha256:41a0be220dd1ed9e998f5891948306eb8c812b512dc398e5a01846d855050799 \
+    --hash=sha256:5751d8a11b956fbfa314f6553d186b94aa70fdb03d8a4d4f1c82dcacf0cbe28a \
+    --hash=sha256:5f61c7d749048fa6e3322258b4263463bfccefecb0dd731b6561cb617a1d9bb9 \
+    --hash=sha256:72e24c521fa2106f19623a3851e9f89ddfdeb9ac63871c7643790f872a305dfc \
+    --hash=sha256:7b97ae6ef5cba2e3bb14256625423413d5ce8d1abb91d4f29b6d1a081da765f8 \
+    --hash=sha256:961e886d8a3590fd2c723cf07be14e2a91cf53c25f02435c04d39e90780e3b53 \
+    --hash=sha256:96d8473848e984184b6728e2c9d391482008646276c3ff084a1bd89e15ff53a1 \
+    --hash=sha256:ae536da50c7ad1e002c3eee101871d93abdc90d9c5f651818450a0d3af718609 \
+    --hash=sha256:b0db0cecf396033abb4a93c95d1602f268b3a68bb0a9cc06a7cff587bb9a7292 \
+    --hash=sha256:cfee9164954c186b191b91d4193989ca994703b2fff406f71cf454a2d3c7327e \
+    --hash=sha256:e6347742ac8f35ded4a46ff835c60e68c22a536a8ae5c4422966d06946b6d4c6 \
+    --hash=sha256:f27d93f0139a3c056172ebb5d4f9056e770fdf0206c2f422ff2ebbad142e09ed \
+    --hash=sha256:f57b76e46a58b63d1c6375017f4564a28f19a5ca912691fd2e4261b3414b618d
+distro==1.4.0 \
+    --hash=sha256:362dde65d846d23baee4b5c058c8586f219b5a54be1cf5fc6ff55c4578392f57 \
+    --hash=sha256:eedf82a470ebe7d010f1872c17237c79ab04097948800029994fa458e52fb4b4
+enum34==1.1.6 \
     --hash=sha256:2d81cbbe0e73112bdfe6ef8576f2238f2ba27dd0d55752a776c41d38b7da2850 \
     --hash=sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a \
     --hash=sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79 \
@@ -1216,18 +1219,18 @@ idna==2.8 \
 ipaddress==1.0.22 \
     --hash=sha256:64b28eec5e78e7510698f6d4da08800a5c575caa4a286c93d651c5d3ff7b6794 \
     --hash=sha256:b146c751ea45cad6188dd6cf2d9b757f6f4f8d6ffb96a023e6f2e26eea02a72c
-josepy==1.1.0 \
-    --hash=sha256:1309a25aac3caeff5239729c58ff9b583f7d022ffdb1553406ddfc8e5b52b76e \
-    --hash=sha256:fb5c62c77d26e04df29cb5ecd01b9ce69b6fcc9e521eb1ca193b7faa2afa7086
+josepy==1.2.0 \
+    --hash=sha256:8ea15573203f28653c00f4ac0142520777b1c59d9eddd8da3f256c6ba3cac916 \
+    --hash=sha256:9cec9a839fe9520f0420e4f38e7219525daccce4813296627436fe444cd002d3
 mock==1.3.0 \
     --hash=sha256:1e247dbecc6ce057299eb7ee019ad68314bb93152e81d9a6110d35f4d5eca0f6 \
     --hash=sha256:3f573a18be94de886d1191f27c168427ef693e8dcfcecf95b170577b2eb69cbb
 parsedatetime==2.4 \
     --hash=sha256:3d817c58fb9570d1eec1dd46fa9448cd644eeed4fb612684b02dfda3a79cb84b \
     --hash=sha256:9ee3529454bf35c40a77115f5a596771e59e1aee8c53306f346c461b8e913094
-pbr==5.1.3 \
-    --hash=sha256:8257baf496c8522437e8a6cfe0f15e00aedc6c0e0e7c9d55eeeeab31e0853843 \
-    --hash=sha256:8c361cc353d988e4f5b998555c88098b9d5964c2e11acf7b0d21925a66bb5824
+pbr==5.4.2 \
+    --hash=sha256:56e52299170b9492513c64be44736d27a512fa7e606f21942160b68ce510b4bc \
+    --hash=sha256:9b321c204a88d8ab5082699469f52cc94c5da45c51f114113d01b3d993c24cdf
 pyOpenSSL==19.0.0 \
     --hash=sha256:aeca66338f6de19d1aa46ed634c3b9ae519a64b458f8468aec688e7e3c20f200 \
     --hash=sha256:c727930ad54b10fc157015014b666f2d8b41f70c0d03e83ab67624fd3dd5d1e6
@@ -1236,14 +1239,14 @@ pyRFC3339==1.1 \
     --hash=sha256:81b8cbe1519cdb79bed04910dd6fa4e181faf8c88dff1e1b987b5f7ab23a5b1a
 pycparser==2.19 \
     --hash=sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3
-pyparsing==2.3.1 \
-    --hash=sha256:66c9268862641abcac4a96ba74506e594c884e3f57690a696d21ad8210ed667a \
-    --hash=sha256:f6c5ef0d7480ad048c054c37632c67fca55299990fff127850181659eea33fc3
+pyparsing==2.4.2 \
+    --hash=sha256:6f98a7b9397e206d78cc01df10131398f1c8b8510a2f4d97d9abd82e1aacdd80 \
+    --hash=sha256:d9338df12903bbf5d65a0e4e87c2161968b10d2e489652bb47001d82a9b028b4
 python-augeas==0.5.0 \
     --hash=sha256:67d59d66cdba8d624e0389b87b2a83a176f21f16a87553b50f5703b23f29bac2
-pytz==2018.9 \
-    --hash=sha256:32b0891edff07e28efe91284ed9c31e123d84bea3fd98e1f72be2508f43ef8d9 \
-    --hash=sha256:d5f05e487007e29e03409f9398d074e158d920d36eb82eaf66fb1136b0c5374c
+pytz==2019.2 \
+    --hash=sha256:26c0b32e437e54a18161324a2fca3c4b9846b74a8dccddd843113109e1116b32 \
+    --hash=sha256:c894d57500a4cd2d5c71114aaab77dbab5eabd9022308ce5ac9bb93a60a6f0c7
 requests==2.21.0 \
     --hash=sha256:502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e \
     --hash=sha256:7bf2a778576d825600030a110f3c0e3e8edc51dfaafe1c146e39a2027784957b
@@ -1253,15 +1256,15 @@ requests-toolbelt==0.9.1 \
 six==1.12.0 \
     --hash=sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c \
     --hash=sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73
-urllib3==1.24.2 \
-    --hash=sha256:4c291ca23bbb55c76518905869ef34bdd5f0e46af7afe6861e8375643ffee1a0 \
-    --hash=sha256:9a247273df709c4fedb38c711e44292304f73f39ab01beda9f6b9fc375669ac3
+urllib3==1.24.3 \
+    --hash=sha256:2393a695cd12afedd0dcb26fe5d50d0cf248e5a66f75dbd89a3d4eb333a61af4 \
+    --hash=sha256:a637e5fae88995b256e3409dc4d52c2e2e0ba32c42a6365fee8bbd2238de3cfb
 zope.component==4.5 \
     --hash=sha256:6edfd626c3b593b72895a8cfcf79bff41f4619194ce996a85bce31ac02b94e55 \
     --hash=sha256:984a06ba3def0b02b1117fa4c45b56e772e8c29c0340820fbf367e440a93a3a4
-zope.deferredimport==4.3 \
-    --hash=sha256:2ddef5a7ecfff132a2dd796253366ecf9748a446e30f1a0b3a636aec9d9c05c5 \
-    --hash=sha256:4aae9cbacb2146cca58e62be0a914f0cec034d3b2d41135ea212ca8a96f4b5ec
+zope.deferredimport==4.3.1 \
+    --hash=sha256:57b2345e7b5eef47efcd4f634ff16c93e4265de3dcf325afc7315ade48d909e1 \
+    --hash=sha256:9a0c211df44aa95f1c4e6d2626f90b400f56989180d3ef96032d708da3d23e0a
 zope.deprecation==4.4.0 \
     --hash=sha256:0d453338f04bacf91bbfba545d8bcdf529aa829e67b705eac8c1a7fdce66e2df \
     --hash=sha256:f1480b74995958b24ce37b0ef04d3663d2683e5d6debc96726eff18acf4ea113
@@ -1309,18 +1312,18 @@ zope.interface==4.6.0 \
     --hash=sha256:d788a3999014ddf416f2dc454efa4a5dbeda657c6aba031cf363741273804c6b \
     --hash=sha256:eed88ae03e1ef3a75a0e96a55a99d7937ed03e53d0cffc2451c208db445a2966 \
     --hash=sha256:f99451f3a579e73b5dd58b1b08d1179791d49084371d9a47baad3b22417f0317
-zope.proxy==4.3.1 \
-    --hash=sha256:0cbcfcafaa3b5fde7ba7a7b9a2b5f09af25c9b90087ad65f9e61359fed0ca63b \
-    --hash=sha256:3de631dd5054a3a20b9ebff0e375f39c0565f1fb9131200d589a6a8f379214cd \
-    --hash=sha256:5429134d04d42262f4dac25f6dea907f6334e9a751ffc62cb1d40226fb52bdeb \
-    --hash=sha256:563c2454b2d0f23bca54d2e0e4d781149b7b06cb5df67e253ca3620f37202dd2 \
-    --hash=sha256:5bcf773345016b1461bb07f70c635b9386e5eaaa08e37d3939dcdf12d3fdbec5 \
-    --hash=sha256:8d84b7aef38c693874e2f2084514522bf73fd720fde0ce2a9352a51315ffa475 \
-    --hash=sha256:90de9473c05819b36816b6cb957097f809691836ed3142648bf62da84b4502fe \
-    --hash=sha256:dd592a69fe872445542a6e1acbefb8e28cbe6b4007b8f5146da917e49b155cc3 \
-    --hash=sha256:e7399ab865399fce322f9cefc6f2f3e4099d087ba581888a9fea1bbe1db42a08 \
-    --hash=sha256:e7d1c280d86d72735a420610df592aac72332194e531a8beff43a592c3a1b8eb \
-    --hash=sha256:e90243fee902adb0c39eceb3c69995c0f2004bc3fdb482fbf629efc656d124ed
+zope.proxy==4.3.2 \
+    --hash=sha256:320a7619992e42142549ebf61e14ce27683b4d14b0cbc45f7c037ba64edb560c \
+    --hash=sha256:824d4dbabbb7deb84f25fdb96ea1eeca436a1802c3c8d323b3eb4ac9d527d41c \
+    --hash=sha256:8a32eb9c94908f3544da2dae3f4a9e6961d78819b88ac6b6f4a51cee2d65f4a0 \
+    --hash=sha256:96265fd3bc3ea646f98482e16307a69de21402eeaaaaf4b841c1161ac2f71bb0 \
+    --hash=sha256:ab6d6975d9c51c13cac828ff03168de21fb562b0664c59bcdc4a4b10f39a5b17 \
+    --hash=sha256:af10cb772391772463f65a58348e2de5ecc06693c16d2078be276dc068bcbb54 \
+    --hash=sha256:b8fd3a3de3f7b6452775e92af22af5977b17b69ac86a38a3ddfe870e40a0d05f \
+    --hash=sha256:bb7088f1bed3b8214284a5e425dc23da56f2f28e8815b7580bfed9e245b6c0b6 \
+    --hash=sha256:bc29b3665eac34f14c4aef5224bef045efcfb1a7d12d78c8685858de5fbf21c0 \
+    --hash=sha256:c39fa6a159affeae5fe31b49d9f5b12bd674fe77271a9a324408b271440c50a7 \
+    --hash=sha256:e946a036ac5b9f897e986ac9dc950a34cffc857d88eae6727b8434fbc4752366
 
 # Contains the requirements for the letsencrypt package.
 #
diff --git a/letsencrypt-auto-source/pieces/dependency-requirements.txt b/letsencrypt-auto-source/pieces/dependency-requirements.txt
index 48c2afd93..2d683eb48 100644
--- a/letsencrypt-auto-source/pieces/dependency-requirements.txt
+++ b/letsencrypt-auto-source/pieces/dependency-requirements.txt
@@ -2,73 +2,76 @@
 # To generate this, do (with docker and package hashin installed):
 # ```
 # letsencrypt-auto-source/rebuild_dependencies.py \
-#   letsencrypt-auto-sources/pieces/dependency-requirements.txt
+#   letsencrypt-auto-source/pieces/dependency-requirements.txt
+# ```
+# If you want to update a single dependency, run commands similar to these:
+# ```
+# pip install hashin
+# hashin -r dependency-requirements.txt cryptography==1.5.2
 # ```
 ConfigArgParse==0.14.0 \
     --hash=sha256:2e2efe2be3f90577aca9415e32cb629aa2ecd92078adbe27b53a03e53ff12e91
 asn1crypto==0.24.0 \
     --hash=sha256:2f1adbb7546ed199e3c90ef23ec95c5cf3585bac7d11fb7eb562a3fe89c64e87 \
     --hash=sha256:9d5c20441baf0cb60a4ac34cc447c6c189024b6b4c6cd7877034f4965c464e49
-certifi==2019.3.9 \
-    --hash=sha256:59b7658e26ca9c7339e00f8f4636cdfe59d34fa37b9b04f6f9e9926b3cece1a5 \
-    --hash=sha256:b26104d6835d1f5e49452a26eb2ff87fe7090b89dfcaee5ea2212697e1e1d7ae
-cffi==1.12.2 \
-    --hash=sha256:00b97afa72c233495560a0793cdc86c2571721b4271c0667addc83c417f3d90f \
-    --hash=sha256:0ba1b0c90f2124459f6966a10c03794082a2f3985cd699d7d63c4a8dae113e11 \
-    --hash=sha256:0bffb69da295a4fc3349f2ec7cbe16b8ba057b0a593a92cbe8396e535244ee9d \
-    --hash=sha256:21469a2b1082088d11ccd79dd84157ba42d940064abbfa59cf5f024c19cf4891 \
-    --hash=sha256:2e4812f7fa984bf1ab253a40f1f4391b604f7fc424a3e21f7de542a7f8f7aedf \
-    --hash=sha256:2eac2cdd07b9049dd4e68449b90d3ef1adc7c759463af5beb53a84f1db62e36c \
-    --hash=sha256:2f9089979d7456c74d21303c7851f158833d48fb265876923edcb2d0194104ed \
-    --hash=sha256:3dd13feff00bddb0bd2d650cdb7338f815c1789a91a6f68fdc00e5c5ed40329b \
-    --hash=sha256:4065c32b52f4b142f417af6f33a5024edc1336aa845b9d5a8d86071f6fcaac5a \
-    --hash=sha256:51a4ba1256e9003a3acf508e3b4f4661bebd015b8180cc31849da222426ef585 \
-    --hash=sha256:59888faac06403767c0cf8cfb3f4a777b2939b1fbd9f729299b5384f097f05ea \
-    --hash=sha256:59c87886640574d8b14910840327f5cd15954e26ed0bbd4e7cef95fa5aef218f \
-    --hash=sha256:610fc7d6db6c56a244c2701575f6851461753c60f73f2de89c79bbf1cc807f33 \
-    --hash=sha256:70aeadeecb281ea901bf4230c6222af0248c41044d6f57401a614ea59d96d145 \
-    --hash=sha256:71e1296d5e66c59cd2c0f2d72dc476d42afe02aeddc833d8e05630a0551dad7a \
-    --hash=sha256:8fc7a49b440ea752cfdf1d51a586fd08d395ff7a5d555dc69e84b1939f7ddee3 \
-    --hash=sha256:9b5c2afd2d6e3771d516045a6cfa11a8da9a60e3d128746a7fe9ab36dfe7221f \
-    --hash=sha256:9c759051ebcb244d9d55ee791259ddd158188d15adee3c152502d3b69005e6bd \
-    --hash=sha256:b4d1011fec5ec12aa7cc10c05a2f2f12dfa0adfe958e56ae38dc140614035804 \
-    --hash=sha256:b4f1d6332339ecc61275bebd1f7b674098a66fea11a00c84d1c58851e618dc0d \
-    --hash=sha256:c030cda3dc8e62b814831faa4eb93dd9a46498af8cd1d5c178c2de856972fd92 \
-    --hash=sha256:c2e1f2012e56d61390c0e668c20c4fb0ae667c44d6f6a2eeea5d7148dcd3df9f \
-    --hash=sha256:c37c77d6562074452120fc6c02ad86ec928f5710fbc435a181d69334b4de1d84 \
-    --hash=sha256:c8149780c60f8fd02752d0429246088c6c04e234b895c4a42e1ea9b4de8d27fb \
-    --hash=sha256:cbeeef1dc3c4299bd746b774f019de9e4672f7cc666c777cd5b409f0b746dac7 \
-    --hash=sha256:e113878a446c6228669144ae8a56e268c91b7f1fafae927adc4879d9849e0ea7 \
-    --hash=sha256:e21162bf941b85c0cda08224dade5def9360f53b09f9f259adb85fc7dd0e7b35 \
-    --hash=sha256:fb6934ef4744becbda3143d30c6604718871495a5e36c408431bf33d9c146889
+certifi==2019.6.16 \
+    --hash=sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939 \
+    --hash=sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695
+cffi==1.12.3 \
+    --hash=sha256:041c81822e9f84b1d9c401182e174996f0bae9991f33725d059b771744290774 \
+    --hash=sha256:046ef9a22f5d3eed06334d01b1e836977eeef500d9b78e9ef693f9380ad0b83d \
+    --hash=sha256:066bc4c7895c91812eff46f4b1c285220947d4aa46fa0a2651ff85f2afae9c90 \
+    --hash=sha256:066c7ff148ae33040c01058662d6752fd73fbc8e64787229ea8498c7d7f4041b \
+    --hash=sha256:2444d0c61f03dcd26dbf7600cf64354376ee579acad77aef459e34efcb438c63 \
+    --hash=sha256:300832850b8f7967e278870c5d51e3819b9aad8f0a2c8dbe39ab11f119237f45 \
+    --hash=sha256:34c77afe85b6b9e967bd8154e3855e847b70ca42043db6ad17f26899a3df1b25 \
+    --hash=sha256:46de5fa00f7ac09f020729148ff632819649b3e05a007d286242c4882f7b1dc3 \
+    --hash=sha256:4aa8ee7ba27c472d429b980c51e714a24f47ca296d53f4d7868075b175866f4b \
+    --hash=sha256:4d0004eb4351e35ed950c14c11e734182591465a33e960a4ab5e8d4f04d72647 \
+    --hash=sha256:4e3d3f31a1e202b0f5a35ba3bc4eb41e2fc2b11c1eff38b362de710bcffb5016 \
+    --hash=sha256:50bec6d35e6b1aaeb17f7c4e2b9374ebf95a8975d57863546fa83e8d31bdb8c4 \
+    --hash=sha256:55cad9a6df1e2a1d62063f79d0881a414a906a6962bc160ac968cc03ed3efcfb \
+    --hash=sha256:5662ad4e4e84f1eaa8efce5da695c5d2e229c563f9d5ce5b0113f71321bcf753 \
+    --hash=sha256:59b4dc008f98fc6ee2bb4fd7fc786a8d70000d058c2bbe2698275bc53a8d3fa7 \
+    --hash=sha256:73e1ffefe05e4ccd7bcea61af76f36077b914f92b76f95ccf00b0c1b9186f3f9 \
+    --hash=sha256:a1f0fd46eba2d71ce1589f7e50a9e2ffaeb739fb2c11e8192aa2b45d5f6cc41f \
+    --hash=sha256:a2e85dc204556657661051ff4bab75a84e968669765c8a2cd425918699c3d0e8 \
+    --hash=sha256:a5457d47dfff24882a21492e5815f891c0ca35fefae8aa742c6c263dac16ef1f \
+    --hash=sha256:a8dccd61d52a8dae4a825cdbb7735da530179fea472903eb871a5513b5abbfdc \
+    --hash=sha256:ae61af521ed676cf16ae94f30fe202781a38d7178b6b4ab622e4eec8cefaff42 \
+    --hash=sha256:b012a5edb48288f77a63dba0840c92d0504aa215612da4541b7b42d849bc83a3 \
+    --hash=sha256:d2c5cfa536227f57f97c92ac30c8109688ace8fa4ac086d19d0af47d134e2909 \
+    --hash=sha256:d42b5796e20aacc9d15e66befb7a345454eef794fdb0737d1af593447c6c8f45 \
+    --hash=sha256:dee54f5d30d775f525894d67b1495625dd9322945e7fee00731952e0368ff42d \
+    --hash=sha256:e070535507bd6aa07124258171be2ee8dfc19119c28ca94c9dfb7efd23564512 \
+    --hash=sha256:e1ff2748c84d97b065cc95429814cdba39bcbd77c9c85c89344b317dc0d9cbff \
+    --hash=sha256:ed851c75d1e0e043cbf5ca9a8e1b13c4c90f3fbd863dacb01c0808e2b5204201
 chardet==3.0.4 \
     --hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae \
     --hash=sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691
 configobj==5.0.6 \
     --hash=sha256:a2f5650770e1c87fb335af19a9b7eb73fc05ccf22144eb68db7d00cd2bcb0902
-cryptography==2.6.1 \
-    --hash=sha256:066f815f1fe46020877c5983a7e747ae140f517f1b09030ec098503575265ce1 \
-    --hash=sha256:210210d9df0afba9e000636e97810117dc55b7157c903a55716bb73e3ae07705 \
-    --hash=sha256:26c821cbeb683facb966045e2064303029d572a87ee69ca5a1bf54bf55f93ca6 \
-    --hash=sha256:2afb83308dc5c5255149ff7d3fb9964f7c9ee3d59b603ec18ccf5b0a8852e2b1 \
-    --hash=sha256:2db34e5c45988f36f7a08a7ab2b69638994a8923853dec2d4af121f689c66dc8 \
-    --hash=sha256:409c4653e0f719fa78febcb71ac417076ae5e20160aec7270c91d009837b9151 \
-    --hash=sha256:45a4f4cf4f4e6a55c8128f8b76b4c057027b27d4c67e3fe157fa02f27e37830d \
-    --hash=sha256:48eab46ef38faf1031e58dfcc9c3e71756a1108f4c9c966150b605d4a1a7f659 \
-    --hash=sha256:6b9e0ae298ab20d371fc26e2129fd683cfc0cfde4d157c6341722de645146537 \
-    --hash=sha256:6c4778afe50f413707f604828c1ad1ff81fadf6c110cb669579dea7e2e98a75e \
-    --hash=sha256:8c33fb99025d353c9520141f8bc989c2134a1f76bac6369cea060812f5b5c2bb \
-    --hash=sha256:9873a1760a274b620a135054b756f9f218fa61ca030e42df31b409f0fb738b6c \
-    --hash=sha256:9b069768c627f3f5623b1cbd3248c5e7e92aec62f4c98827059eed7053138cc9 \
-    --hash=sha256:9e4ce27a507e4886efbd3c32d120db5089b906979a4debf1d5939ec01b9dd6c5 \
-    --hash=sha256:acb424eaca214cb08735f1a744eceb97d014de6530c1ea23beb86d9c6f13c2ad \
-    --hash=sha256:c8181c7d77388fe26ab8418bb088b1a1ef5fde058c6926790c8a0a3d94075a4a \
-    --hash=sha256:d4afbb0840f489b60f5a580a41a1b9c3622e08ecb5eec8614d4fb4cd914c4460 \
-    --hash=sha256:d9ed28030797c00f4bc43c86bf819266c76a5ea61d006cd4078a93ebf7da6bfd \
-    --hash=sha256:e603aa7bb52e4e8ed4119a58a03b60323918467ef209e6ff9db3ac382e5cf2c6
-# Package enum34 needs to be explicitly limited to Python2.x, in order to avoid
-# certbot-auto failures on Python 3.6+ which enum34 doesn't support. See #5456.
-enum34==1.1.6 ; python_version < '3.4' \
+cryptography==2.7 \
+    --hash=sha256:24b61e5fcb506424d3ec4e18bca995833839bf13c59fc43e530e488f28d46b8c \
+    --hash=sha256:25dd1581a183e9e7a806fe0543f485103232f940fcfc301db65e630512cce643 \
+    --hash=sha256:3452bba7c21c69f2df772762be0066c7ed5dc65df494a1d53a58b683a83e1216 \
+    --hash=sha256:41a0be220dd1ed9e998f5891948306eb8c812b512dc398e5a01846d855050799 \
+    --hash=sha256:5751d8a11b956fbfa314f6553d186b94aa70fdb03d8a4d4f1c82dcacf0cbe28a \
+    --hash=sha256:5f61c7d749048fa6e3322258b4263463bfccefecb0dd731b6561cb617a1d9bb9 \
+    --hash=sha256:72e24c521fa2106f19623a3851e9f89ddfdeb9ac63871c7643790f872a305dfc \
+    --hash=sha256:7b97ae6ef5cba2e3bb14256625423413d5ce8d1abb91d4f29b6d1a081da765f8 \
+    --hash=sha256:961e886d8a3590fd2c723cf07be14e2a91cf53c25f02435c04d39e90780e3b53 \
+    --hash=sha256:96d8473848e984184b6728e2c9d391482008646276c3ff084a1bd89e15ff53a1 \
+    --hash=sha256:ae536da50c7ad1e002c3eee101871d93abdc90d9c5f651818450a0d3af718609 \
+    --hash=sha256:b0db0cecf396033abb4a93c95d1602f268b3a68bb0a9cc06a7cff587bb9a7292 \
+    --hash=sha256:cfee9164954c186b191b91d4193989ca994703b2fff406f71cf454a2d3c7327e \
+    --hash=sha256:e6347742ac8f35ded4a46ff835c60e68c22a536a8ae5c4422966d06946b6d4c6 \
+    --hash=sha256:f27d93f0139a3c056172ebb5d4f9056e770fdf0206c2f422ff2ebbad142e09ed \
+    --hash=sha256:f57b76e46a58b63d1c6375017f4564a28f19a5ca912691fd2e4261b3414b618d
+distro==1.4.0 \
+    --hash=sha256:362dde65d846d23baee4b5c058c8586f219b5a54be1cf5fc6ff55c4578392f57 \
+    --hash=sha256:eedf82a470ebe7d010f1872c17237c79ab04097948800029994fa458e52fb4b4
+enum34==1.1.6 \
     --hash=sha256:2d81cbbe0e73112bdfe6ef8576f2238f2ba27dd0d55752a776c41d38b7da2850 \
     --hash=sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a \
     --hash=sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79 \
@@ -84,18 +87,18 @@ idna==2.8 \
 ipaddress==1.0.22 \
     --hash=sha256:64b28eec5e78e7510698f6d4da08800a5c575caa4a286c93d651c5d3ff7b6794 \
     --hash=sha256:b146c751ea45cad6188dd6cf2d9b757f6f4f8d6ffb96a023e6f2e26eea02a72c
-josepy==1.1.0 \
-    --hash=sha256:1309a25aac3caeff5239729c58ff9b583f7d022ffdb1553406ddfc8e5b52b76e \
-    --hash=sha256:fb5c62c77d26e04df29cb5ecd01b9ce69b6fcc9e521eb1ca193b7faa2afa7086
+josepy==1.2.0 \
+    --hash=sha256:8ea15573203f28653c00f4ac0142520777b1c59d9eddd8da3f256c6ba3cac916 \
+    --hash=sha256:9cec9a839fe9520f0420e4f38e7219525daccce4813296627436fe444cd002d3
 mock==1.3.0 \
     --hash=sha256:1e247dbecc6ce057299eb7ee019ad68314bb93152e81d9a6110d35f4d5eca0f6 \
     --hash=sha256:3f573a18be94de886d1191f27c168427ef693e8dcfcecf95b170577b2eb69cbb
 parsedatetime==2.4 \
     --hash=sha256:3d817c58fb9570d1eec1dd46fa9448cd644eeed4fb612684b02dfda3a79cb84b \
     --hash=sha256:9ee3529454bf35c40a77115f5a596771e59e1aee8c53306f346c461b8e913094
-pbr==5.1.3 \
-    --hash=sha256:8257baf496c8522437e8a6cfe0f15e00aedc6c0e0e7c9d55eeeeab31e0853843 \
-    --hash=sha256:8c361cc353d988e4f5b998555c88098b9d5964c2e11acf7b0d21925a66bb5824
+pbr==5.4.2 \
+    --hash=sha256:56e52299170b9492513c64be44736d27a512fa7e606f21942160b68ce510b4bc \
+    --hash=sha256:9b321c204a88d8ab5082699469f52cc94c5da45c51f114113d01b3d993c24cdf
 pyOpenSSL==19.0.0 \
     --hash=sha256:aeca66338f6de19d1aa46ed634c3b9ae519a64b458f8468aec688e7e3c20f200 \
     --hash=sha256:c727930ad54b10fc157015014b666f2d8b41f70c0d03e83ab67624fd3dd5d1e6
@@ -104,14 +107,14 @@ pyRFC3339==1.1 \
     --hash=sha256:81b8cbe1519cdb79bed04910dd6fa4e181faf8c88dff1e1b987b5f7ab23a5b1a
 pycparser==2.19 \
     --hash=sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3
-pyparsing==2.3.1 \
-    --hash=sha256:66c9268862641abcac4a96ba74506e594c884e3f57690a696d21ad8210ed667a \
-    --hash=sha256:f6c5ef0d7480ad048c054c37632c67fca55299990fff127850181659eea33fc3
+pyparsing==2.4.2 \
+    --hash=sha256:6f98a7b9397e206d78cc01df10131398f1c8b8510a2f4d97d9abd82e1aacdd80 \
+    --hash=sha256:d9338df12903bbf5d65a0e4e87c2161968b10d2e489652bb47001d82a9b028b4
 python-augeas==0.5.0 \
     --hash=sha256:67d59d66cdba8d624e0389b87b2a83a176f21f16a87553b50f5703b23f29bac2
-pytz==2018.9 \
-    --hash=sha256:32b0891edff07e28efe91284ed9c31e123d84bea3fd98e1f72be2508f43ef8d9 \
-    --hash=sha256:d5f05e487007e29e03409f9398d074e158d920d36eb82eaf66fb1136b0c5374c
+pytz==2019.2 \
+    --hash=sha256:26c0b32e437e54a18161324a2fca3c4b9846b74a8dccddd843113109e1116b32 \
+    --hash=sha256:c894d57500a4cd2d5c71114aaab77dbab5eabd9022308ce5ac9bb93a60a6f0c7
 requests==2.21.0 \
     --hash=sha256:502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e \
     --hash=sha256:7bf2a778576d825600030a110f3c0e3e8edc51dfaafe1c146e39a2027784957b
@@ -121,15 +124,15 @@ requests-toolbelt==0.9.1 \
 six==1.12.0 \
     --hash=sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c \
     --hash=sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73
-urllib3==1.24.2 \
-    --hash=sha256:4c291ca23bbb55c76518905869ef34bdd5f0e46af7afe6861e8375643ffee1a0 \
-    --hash=sha256:9a247273df709c4fedb38c711e44292304f73f39ab01beda9f6b9fc375669ac3
+urllib3==1.24.3 \
+    --hash=sha256:2393a695cd12afedd0dcb26fe5d50d0cf248e5a66f75dbd89a3d4eb333a61af4 \
+    --hash=sha256:a637e5fae88995b256e3409dc4d52c2e2e0ba32c42a6365fee8bbd2238de3cfb
 zope.component==4.5 \
     --hash=sha256:6edfd626c3b593b72895a8cfcf79bff41f4619194ce996a85bce31ac02b94e55 \
     --hash=sha256:984a06ba3def0b02b1117fa4c45b56e772e8c29c0340820fbf367e440a93a3a4
-zope.deferredimport==4.3 \
-    --hash=sha256:2ddef5a7ecfff132a2dd796253366ecf9748a446e30f1a0b3a636aec9d9c05c5 \
-    --hash=sha256:4aae9cbacb2146cca58e62be0a914f0cec034d3b2d41135ea212ca8a96f4b5ec
+zope.deferredimport==4.3.1 \
+    --hash=sha256:57b2345e7b5eef47efcd4f634ff16c93e4265de3dcf325afc7315ade48d909e1 \
+    --hash=sha256:9a0c211df44aa95f1c4e6d2626f90b400f56989180d3ef96032d708da3d23e0a
 zope.deprecation==4.4.0 \
     --hash=sha256:0d453338f04bacf91bbfba545d8bcdf529aa829e67b705eac8c1a7fdce66e2df \
     --hash=sha256:f1480b74995958b24ce37b0ef04d3663d2683e5d6debc96726eff18acf4ea113
@@ -177,15 +180,15 @@ zope.interface==4.6.0 \
     --hash=sha256:d788a3999014ddf416f2dc454efa4a5dbeda657c6aba031cf363741273804c6b \
     --hash=sha256:eed88ae03e1ef3a75a0e96a55a99d7937ed03e53d0cffc2451c208db445a2966 \
     --hash=sha256:f99451f3a579e73b5dd58b1b08d1179791d49084371d9a47baad3b22417f0317
-zope.proxy==4.3.1 \
-    --hash=sha256:0cbcfcafaa3b5fde7ba7a7b9a2b5f09af25c9b90087ad65f9e61359fed0ca63b \
-    --hash=sha256:3de631dd5054a3a20b9ebff0e375f39c0565f1fb9131200d589a6a8f379214cd \
-    --hash=sha256:5429134d04d42262f4dac25f6dea907f6334e9a751ffc62cb1d40226fb52bdeb \
-    --hash=sha256:563c2454b2d0f23bca54d2e0e4d781149b7b06cb5df67e253ca3620f37202dd2 \
-    --hash=sha256:5bcf773345016b1461bb07f70c635b9386e5eaaa08e37d3939dcdf12d3fdbec5 \
-    --hash=sha256:8d84b7aef38c693874e2f2084514522bf73fd720fde0ce2a9352a51315ffa475 \
-    --hash=sha256:90de9473c05819b36816b6cb957097f809691836ed3142648bf62da84b4502fe \
-    --hash=sha256:dd592a69fe872445542a6e1acbefb8e28cbe6b4007b8f5146da917e49b155cc3 \
-    --hash=sha256:e7399ab865399fce322f9cefc6f2f3e4099d087ba581888a9fea1bbe1db42a08 \
-    --hash=sha256:e7d1c280d86d72735a420610df592aac72332194e531a8beff43a592c3a1b8eb \
-    --hash=sha256:e90243fee902adb0c39eceb3c69995c0f2004bc3fdb482fbf629efc656d124ed
+zope.proxy==4.3.2 \
+    --hash=sha256:320a7619992e42142549ebf61e14ce27683b4d14b0cbc45f7c037ba64edb560c \
+    --hash=sha256:824d4dbabbb7deb84f25fdb96ea1eeca436a1802c3c8d323b3eb4ac9d527d41c \
+    --hash=sha256:8a32eb9c94908f3544da2dae3f4a9e6961d78819b88ac6b6f4a51cee2d65f4a0 \
+    --hash=sha256:96265fd3bc3ea646f98482e16307a69de21402eeaaaaf4b841c1161ac2f71bb0 \
+    --hash=sha256:ab6d6975d9c51c13cac828ff03168de21fb562b0664c59bcdc4a4b10f39a5b17 \
+    --hash=sha256:af10cb772391772463f65a58348e2de5ecc06693c16d2078be276dc068bcbb54 \
+    --hash=sha256:b8fd3a3de3f7b6452775e92af22af5977b17b69ac86a38a3ddfe870e40a0d05f \
+    --hash=sha256:bb7088f1bed3b8214284a5e425dc23da56f2f28e8815b7580bfed9e245b6c0b6 \
+    --hash=sha256:bc29b3665eac34f14c4aef5224bef045efcfb1a7d12d78c8685858de5fbf21c0 \
+    --hash=sha256:c39fa6a159affeae5fe31b49d9f5b12bd674fe77271a9a324408b271440c50a7 \
+    --hash=sha256:e946a036ac5b9f897e986ac9dc950a34cffc857d88eae6727b8434fbc4752366
diff --git a/letsencrypt-auto-source/rebuild_dependencies.py b/letsencrypt-auto-source/rebuild_dependencies.py
index fb4c1dfb9..e5acf7db5 100755
--- a/letsencrypt-auto-source/rebuild_dependencies.py
+++ b/letsencrypt-auto-source/rebuild_dependencies.py
@@ -33,7 +33,7 @@ DISTRIBUTION_LIST = [
     'fedora:29',
 ]
 
-# Theses constraints will be added while gathering dependencies on each distribution.
+# These constraints will be added while gathering dependencies on each distribution.
 # It can be used because a particular version for a package is required for any reason,
 # or to solve a version conflict between two distributions requirements.
 AUTHORITATIVE_CONSTRAINTS = {
@@ -45,7 +45,10 @@ AUTHORITATIVE_CONSTRAINTS = {
     # Package enum34 needs to be explicitly limited to Python2.x, in order to avoid
     # certbot-auto failures on Python 3.6+ which enum34 doesn't support. See #5456.
     # TODO: hashin seems to overwrite environment markers in dependencies. This needs to be fixed.
-    'enum34': '1.1.6 ; python_version < \'3.4\''
+    'enum34': '1.1.6 ; python_version < \'3.4\'',
+    # Newer versions of requests dropped support for python 3.4. Once Certbot does as well,
+    # we should unpin the dependency.
+    'requests': '2.21.0',
 }
 
 
diff --git a/setup.py b/setup.py
index 017b66619..4bcdf78c3 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ install_requires = [
     'ConfigArgParse>=0.9.3',
     'configobj',
     'cryptography>=1.2.3',  # load_pem_x509_certificate
+    'distro>=1.0.1',
     # 1.1.0+ is required to avoid the warnings described at
     # https://github.com/certbot/josepy/issues/13.
     'josepy>=1.1.0',
diff --git a/tools/oldest_constraints.txt b/tools/oldest_constraints.txt
index e48d6b13c..73465639f 100644
--- a/tools/oldest_constraints.txt
+++ b/tools/oldest_constraints.txt
@@ -51,6 +51,7 @@ funcsigs==0.4
 zope.hookable==4.0.4
 
 # Ubuntu Bionic constraints.
+distro==1.0.1
 # Lexicon oldest constraint is overridden appropriately on relevant DNS provider plugins
 # using their local-oldest-requirements.txt
 dns-lexicon==2.2.1