diff --git a/roles/matrix-synapse/defaults/main.yml b/roles/matrix-synapse/defaults/main.yml
index 3f2a02a53..f1a3e457b 100644
--- a/roles/matrix-synapse/defaults/main.yml
+++ b/roles/matrix-synapse/defaults/main.yml
@@ -9,7 +9,7 @@ matrix_synapse_container_image_self_build_repo: "https://github.com/matrix-org/s
 
 matrix_synapse_docker_image: "{{ matrix_synapse_docker_image_name_prefix }}matrixdotorg/synapse:{{ matrix_synapse_docker_image_tag }}"
 matrix_synapse_docker_image_name_prefix: "{{ 'localhost/' if matrix_synapse_container_image_self_build else matrix_container_global_registry_prefix }}"
-matrix_synapse_version: v1.52.0
+matrix_synapse_version: v1.53.0
 matrix_synapse_docker_image_tag: "{{ matrix_synapse_version }}"
 matrix_synapse_docker_image_force_pull: "{{ matrix_synapse_docker_image.endswith(':latest') }}"
 
diff --git a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2 b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
index af6e3e130..0308b4065 100644
--- a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
+++ b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
@@ -776,11 +776,16 @@ caches:
    per_cache_factors:
      #get_users_who_share_room_with_user: 2.0
 
-  # Controls how long an entry can be in a cache without having been
-  # accessed before being evicted. Defaults to None, which means
-  # entries are never evicted based on time.
+  # Controls whether cache entries are evicted after a specified time
+  # period. Defaults to true. Uncomment to disable this feature.
   #
-  #expiry_time: 30m
+  #expire_caches: false
+
+  # If expire_caches is enabled, this flag controls how long an entry can
+  # be in a cache without having been accessed before being evicted.
+  # Defaults to 30m. Uncomment to set a different time to live for cache entries.
+  #
+  #cache_entry_ttl: 30m
 
   # Controls how long the results of a /sync request are cached for after
   # a successful response is returned. A higher duration can help clients with
@@ -890,6 +895,9 @@ log_config: "/data/{{ matrix_server_fqn_matrix }}.log.config"
 #   - one for ratelimiting how often a user or IP can attempt to validate a 3PID.
 #   - two for ratelimiting how often invites can be sent in a room or to a
 #     specific user.
+#   - one for ratelimiting 3PID invites (i.e. invites sent to a third-party ID
+#     such as an email address or a phone number) based on the account that's
+#     sending the invite.
 #
 # The defaults are as shown below.
 #
@@ -944,6 +952,10 @@ rc_joins: {{ matrix_synapse_rc_joins|to_json }}
 #  per_user:
 #    per_second: 0.003
 #    burst_count: 5
+#
+#rc_third_party_invite:
+#  per_second: 0.2
+#  burst_count: 10
 
 # Ratelimiting settings for incoming federation
 #
diff --git a/roles/matrix-synapse/vars/workers.yml b/roles/matrix-synapse/vars/workers.yml
index 7145e0fc3..48530312c 100644
--- a/roles/matrix-synapse/vars/workers.yml
+++ b/roles/matrix-synapse/vars/workers.yml
@@ -64,7 +64,7 @@ matrix_synapse_workers_generic_worker_endpoints:
   # Registration/login requests
   - ^/_matrix/client/(api/v1|r0|v3|unstable)/login$
   - ^/_matrix/client/(r0|v3|unstable)/register$
-  - ^/_matrix/client/unstable/org.matrix.msc3231/register/org.matrix.msc3231.login.registration_token/validity$
+  - ^/_matrix/client/v1/register/m.login.registration_token/validity$
 
   # Event sending requests
   - ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/redact
@@ -206,7 +206,7 @@ matrix_synapse_workers_generic_worker_endpoints:
   # You might also wish to investigate the `update_user_directory` and
   # `media_instance_running_background_jobs` settings.
 
-  # pusher worker (no API endpoints) [
+# pusher worker (no API endpoints) [
   # Handles sending push notifications to sygnal and email. Doesn't handle any
   # REST endpoints itself, but you should set `start_pushers: False` in the
   # shared configuration file to stop the main synapse sending push notifications.
@@ -220,18 +220,18 @@ matrix_synapse_workers_generic_worker_endpoints:
   #     - pusher_worker2
   # ```
 
-  # ]
+# ]
 
-  # appservice worker (no API endpoints) [
+# appservice worker (no API endpoints) [
   # Handles sending output traffic to Application Services. Doesn't handle any
   # REST endpoints itself, but you should set `notify_appservices: False` in the
   # shared configuration file to stop the main synapse sending appservice notifications.
 
   # Note this worker cannot be load-balanced: only one instance should be active.
 
-  # ]
+# ]
 
-  # federation_sender worker (no API endpoints) [
+# federation_sender worker (no API endpoints) [
   # Handles sending federation traffic to other servers. Doesn't handle any
   # REST endpoints itself, but you should set `send_federation: False` in the
   # shared configuration file to stop the main synapse sending this traffic.