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-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/python_dependencies.py3
2 files changed, 3 insertions, 2 deletions
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 5eac40730a..441cd8b339 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -47,7 +47,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.33.0"
+__version__ = "1.33.1"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index d58eeeaa74..2113c620c6 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -78,7 +78,8 @@ REQUIREMENTS = [
     # we use attr.validators.deep_iterable, which arrived in 19.1.0 (Note:
     # Fedora 31 only has 19.1, so if we want to upgrade we should wait until 33
     # is out in November.)
-    "attrs>=19.1.0",
+    # Note: 21.1.0 broke `/sync`, see #9936
+    "attrs>=19.1.0,<21.1.0",
     "netaddr>=0.7.18",
     "Jinja2>=2.9",
     "bleach>=1.4.3",