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-rw-r--r--synapse/python_dependencies.py5
1 files changed, 2 insertions, 3 deletions
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 8b4312e5a3..8ec1a619a2 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -68,9 +68,8 @@ REQUIREMENTS = [
     "phonenumbers>=8.2.0",
     "six>=1.10",
     "prometheus_client>=0.0.18,<0.8.0",
-    # we use attr.s(slots), which arrived in 16.0.0
-    # Twisted 18.7.0 requires attrs>=17.4.0
-    "attrs>=17.4.0",
+    # we use attr.validators.deep_iterable, which arrived in 19.1.0
+    "attrs>=19.1.0",
     "netaddr>=0.7.18",
     "Jinja2>=2.9",
     "bleach>=1.4.3",