From a9fa70c3d5839ce5b22bf28dd5972bd0cca37f02 Mon Sep 17 00:00:00 2001
From: Sajith Sasidharan <sajith@hcoop.net>
Date: Fri, 21 Aug 2020 15:53:58 -0400
Subject: [PATCH] Add upper bound for `attrs` library

---
 newsfragments/3389.minor | 0
 setup.py                 | 3 ++-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 newsfragments/3389.minor

diff --git a/newsfragments/3389.minor b/newsfragments/3389.minor
new file mode 100644
index 000000000..e69de29bb
diff --git a/setup.py b/setup.py
index a35023b8b..db5a5490d 100644
--- a/setup.py
+++ b/setup.py
@@ -117,7 +117,8 @@ install_requires = [
     "eliot ~= 1.7",
 
     # A great way to define types of values.
-    "attrs >= 18.2.0",
+    # XXX: drop the upper bound: https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3390
+    "attrs >= 18.2.0, < 20",
 
     # WebSocket library for twisted and asyncio
     "autobahn >= 19.5.2",