diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 546231bec0..271c17c226 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -75,11 +75,9 @@ REQUIREMENTS = [
"phonenumbers>=8.2.0",
# we use GaugeHistogramMetric, which was added in prom-client 0.4.0.
"prometheus_client>=0.4.0",
- # 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.)
+ # we use `order`, which arrived in attrs 19.2.0.
# Note: 21.1.0 broke `/sync`, see #9936
- "attrs>=19.1.0,!=21.1.0",
+ "attrs>=19.2.0,!=21.1.0",
"netaddr>=0.7.18",
"Jinja2>=2.9",
"bleach>=1.4.3",
@@ -98,11 +96,6 @@ CONDITIONAL_REQUIREMENTS = {
"psycopg2cffi>=2.8 ; platform_python_implementation == 'PyPy'",
"psycopg2cffi-compat==1.1 ; platform_python_implementation == 'PyPy'",
],
- # ACME support is required to provision TLS certificates from authorities
- # that use the protocol, such as Let's Encrypt.
- "acme": [
- "txacme>=0.9.2",
- ],
"saml2": [
"pysaml2>=4.5.0",
],
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