diff --git a/changelog.d/12884.misc b/changelog.d/12884.misc
new file mode 100644
index 000000000..56eead947
--- /dev/null
+++ b/changelog.d/12884.misc
@@ -0,0 +1 @@
+Use constants for EDU types.
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 4a0552e7e..f03fdd6da 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -137,7 +137,13 @@ class DeviceKeyAlgorithms:
 
 
 class EduTypes:
-    Presence: Final = "m.presence"
+    PRESENCE: Final = "m.presence"
+    TYPING: Final = "m.typing"
+    RECEIPT: Final = "m.receipt"
+    DEVICE_LIST_UPDATE: Final = "m.device_list_update"
+    SIGNING_KEY_UPDATE: Final = "m.signing_key_update"
+    UNSTABLE_SIGNING_KEY_UPDATE: Final = "org.matrix.signing_key_update"
+    DIRECT_TO_DEVICE: Final = "m.direct_to_device"
 
 
 class RejectedReason:
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index b91ce06de..b00714751 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -33,7 +33,7 @@ from typing import (
 import jsonschema
 from jsonschema import FormatChecker
 
-from synapse.api.constants import EventContentFields
+from synapse.api.constants import EduTypes, EventContentFields
 from synapse.api.errors import SynapseError
 from synapse.api.presence import UserPresenceState
 from synapse.events import EventBase
@@ -347,7 +347,7 @@ class Filter:
             user_id = event.user_id
             field_matchers = {
                 "senders": lambda v: user_id == v,
-                "types": lambda v: "m.presence" == v,
+                "types": lambda v: EduTypes.PRESENCE == v,
             }
             return self._check_fields(field_matchers)
         else:
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index b8232e525..5b227b85f 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -1353,7 +1353,7 @@ class FederationHandlerRegistry:
         self._edu_type_to_instance[edu_type] = instance_names
 
     async def on_edu(self, edu_type: str, origin: str, content: dict) -> None:
-        if not self.config.server.use_presence and edu_type == EduTypes.Presence:
+        if not self.config.server.use_presence and edu_type == EduTypes.PRESENCE:
             return
 
         # Check if we have a handler on this instance
diff --git a/synapse/federation/sender/per_destination_queue.py b/synapse/federation/sender/per_destination_queue.py
index 8983b5a53..333ca9a97 100644
--- a/synapse/federation/sender/per_destination_queue.py
+++ b/synapse/federation/sender/per_destination_queue.py
@@ -21,6 +21,7 @@ from typing import TYPE_CHECKING, Dict, Hashable, Iterable, List, Optional, Tupl
 import attr
 from prometheus_client import Counter
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import (
     FederationDeniedError,
     HttpResponseException,
@@ -542,7 +543,7 @@ class PerDestinationQueue:
         edu = Edu(
             origin=self._server_name,
             destination=self._destination,
-            edu_type="m.receipt",
+            edu_type=EduTypes.RECEIPT,
             content=self._pending_rrs,
         )
         self._pending_rrs = {}
@@ -592,7 +593,7 @@ class PerDestinationQueue:
             Edu(
                 origin=self._server_name,
                 destination=self._destination,
-                edu_type="m.direct_to_device",
+                edu_type=EduTypes.DIRECT_TO_DEVICE,
                 content=content,
             )
             for content in contents
@@ -670,7 +671,7 @@ class _TransactionQueueManager:
                 Edu(
                     origin=self.queue._server_name,
                     destination=self.queue._destination,
-                    edu_type="m.presence",
+                    edu_type=EduTypes.PRESENCE,
                     content={
                         "push": [
                             format_user_presence_state(
diff --git a/synapse/federation/sender/transaction_manager.py b/synapse/federation/sender/transaction_manager.py
index 0c1cad86a..75081810f 100644
--- a/synapse/federation/sender/transaction_manager.py
+++ b/synapse/federation/sender/transaction_manager.py
@@ -16,6 +16,7 @@ from typing import TYPE_CHECKING, List
 
 from prometheus_client import Gauge
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import HttpResponseException
 from synapse.events import EventBase
 from synapse.federation.persistence import TransactionActions
@@ -126,7 +127,10 @@ class TransactionManager:
                 len(edus),
             )
             if issue_8631_logger.isEnabledFor(logging.DEBUG):
-                DEVICE_UPDATE_EDUS = {"m.device_list_update", "m.signing_key_update"}
+                DEVICE_UPDATE_EDUS = {
+                    EduTypes.DEVICE_LIST_UPDATE,
+                    EduTypes.SIGNING_KEY_UPDATE,
+                }
                 device_list_updates = [
                     edu.content for edu in edus if edu.edu_type in DEVICE_UPDATE_EDUS
                 ]
diff --git a/synapse/federation/transport/server/federation.py b/synapse/federation/transport/server/federation.py
index 57e8fb21b..7dfb89066 100644
--- a/synapse/federation/transport/server/federation.py
+++ b/synapse/federation/transport/server/federation.py
@@ -27,6 +27,7 @@ from typing import (
 from matrix_common.versionstring import get_distribution_version_string
 from typing_extensions import Literal
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import Codes, SynapseError
 from synapse.api.room_versions import RoomVersions
 from synapse.api.urls import FEDERATION_UNSTABLE_PREFIX, FEDERATION_V2_PREFIX
@@ -108,7 +109,10 @@ class FederationSendServlet(BaseFederationServerServlet):
             )
 
             if issue_8631_logger.isEnabledFor(logging.DEBUG):
-                DEVICE_UPDATE_EDUS = ["m.device_list_update", "m.signing_key_update"]
+                DEVICE_UPDATE_EDUS = [
+                    EduTypes.DEVICE_LIST_UPDATE,
+                    EduTypes.SIGNING_KEY_UPDATE,
+                ]
                 device_list_updates = [
                     edu.get("content", {})
                     for edu in transaction_data.get("edus", [])
diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 1da7bcc85..814553e09 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -19,7 +19,7 @@ from prometheus_client import Counter
 from twisted.internet import defer
 
 import synapse
-from synapse.api.constants import EventTypes
+from synapse.api.constants import EduTypes, EventTypes
 from synapse.appservice import ApplicationService
 from synapse.events import EventBase
 from synapse.handlers.presence import format_user_presence_state
@@ -503,7 +503,7 @@ class ApplicationServicesHandler:
             time_now = self.clock.time_msec()
             events.extend(
                 {
-                    "type": "m.presence",
+                    "type": EduTypes.PRESENCE,
                     "sender": event.user_id,
                     "content": format_user_presence_state(
                         event, time_now, include_user_id=False
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index b21e46986..438a54933 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -28,7 +28,7 @@ from typing import (
 )
 
 from synapse.api import errors
-from synapse.api.constants import EventTypes
+from synapse.api.constants import EduTypes, EventTypes
 from synapse.api.errors import (
     Codes,
     FederationDeniedError,
@@ -279,7 +279,8 @@ class DeviceHandler(DeviceWorkerHandler):
         federation_registry = hs.get_federation_registry()
 
         federation_registry.register_edu_handler(
-            "m.device_list_update", self.device_list_updater.incoming_device_list_update
+            EduTypes.DEVICE_LIST_UPDATE,
+            self.device_list_updater.incoming_device_list_update,
         )
 
         hs.get_distributor().observe("user_left_room", self.user_left_room)
diff --git a/synapse/handlers/devicemessage.py b/synapse/handlers/devicemessage.py
index 53668cce3..444c08bc2 100644
--- a/synapse/handlers/devicemessage.py
+++ b/synapse/handlers/devicemessage.py
@@ -15,7 +15,7 @@
 import logging
 from typing import TYPE_CHECKING, Any, Dict
 
-from synapse.api.constants import ToDeviceEventTypes
+from synapse.api.constants import EduTypes, ToDeviceEventTypes
 from synapse.api.errors import SynapseError
 from synapse.api.ratelimiting import Ratelimiter
 from synapse.logging.context import run_in_background
@@ -59,11 +59,11 @@ class DeviceMessageHandler:
         # to the appropriate worker.
         if hs.get_instance_name() in hs.config.worker.writers.to_device:
             hs.get_federation_registry().register_edu_handler(
-                "m.direct_to_device", self.on_direct_to_device_edu
+                EduTypes.DIRECT_TO_DEVICE, self.on_direct_to_device_edu
             )
         else:
             hs.get_federation_registry().register_instances_for_edu(
-                "m.direct_to_device",
+                EduTypes.DIRECT_TO_DEVICE,
                 hs.config.worker.writers.to_device,
             )
 
diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index e6c2cfb8c..52bb5c9c5 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -25,6 +25,7 @@ from unpaddedbase64 import decode_base64
 
 from twisted.internet import defer
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import CodeMessageException, Codes, NotFoundError, SynapseError
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.logging.opentracing import log_kv, set_tag, tag_args, trace
@@ -66,13 +67,13 @@ class E2eKeysHandler:
             # Only register this edu handler on master as it requires writing
             # device updates to the db
             federation_registry.register_edu_handler(
-                "m.signing_key_update",
+                EduTypes.SIGNING_KEY_UPDATE,
                 self._edu_updater.incoming_signing_key_update,
             )
             # also handle the unstable version
             # FIXME: remove this when enough servers have upgraded
             federation_registry.register_edu_handler(
-                "org.matrix.signing_key_update",
+                EduTypes.UNSTABLE_SIGNING_KEY_UPDATE,
                 self._edu_updater.incoming_signing_key_update,
             )
 
diff --git a/synapse/handlers/events.py b/synapse/handlers/events.py
index 82a5aac3d..cb7e0ca7a 100644
--- a/synapse/handlers/events.py
+++ b/synapse/handlers/events.py
@@ -113,7 +113,7 @@ class EventStreamHandler:
                     states = await presence_handler.get_states(users)
                     to_add.extend(
                         {
-                            "type": EduTypes.Presence,
+                            "type": EduTypes.PRESENCE,
                             "content": format_user_presence_state(state, time_now),
                         }
                         for state in states
diff --git a/synapse/handlers/initial_sync.py b/synapse/handlers/initial_sync.py
index c06932a41..fbdbeeedf 100644
--- a/synapse/handlers/initial_sync.py
+++ b/synapse/handlers/initial_sync.py
@@ -274,7 +274,7 @@ class InitialSyncHandler:
             "rooms": rooms_ret,
             "presence": [
                 {
-                    "type": "m.presence",
+                    "type": EduTypes.PRESENCE,
                     "content": format_user_presence_state(event, now),
                 }
                 for event in presence
@@ -439,7 +439,7 @@ class InitialSyncHandler:
 
             return [
                 {
-                    "type": EduTypes.Presence,
+                    "type": EduTypes.PRESENCE,
                     "content": format_user_presence_state(s, time_now),
                 }
                 for s in states
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index dd84e6c88..bf112b9e1 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -49,7 +49,7 @@ from prometheus_client import Counter
 from typing_extensions import ContextManager
 
 import synapse.metrics
-from synapse.api.constants import EventTypes, Membership, PresenceState
+from synapse.api.constants import EduTypes, EventTypes, Membership, PresenceState
 from synapse.api.errors import SynapseError
 from synapse.api.presence import UserPresenceState
 from synapse.appservice import ApplicationService
@@ -394,7 +394,7 @@ class WorkerPresenceHandler(BasePresenceHandler):
 
         # Route presence EDUs to the right worker
         hs.get_federation_registry().register_instances_for_edu(
-            "m.presence",
+            EduTypes.PRESENCE,
             hs.config.worker.writers.presence,
         )
 
@@ -649,7 +649,9 @@ class PresenceHandler(BasePresenceHandler):
 
         federation_registry = hs.get_federation_registry()
 
-        federation_registry.register_edu_handler("m.presence", self.incoming_presence)
+        federation_registry.register_edu_handler(
+            EduTypes.PRESENCE, self.incoming_presence
+        )
 
         LaterGauge(
             "synapse_handlers_presence_user_to_current_state_size",
diff --git a/synapse/handlers/receipts.py b/synapse/handlers/receipts.py
index e6a35f1d0..43d2882b0 100644
--- a/synapse/handlers/receipts.py
+++ b/synapse/handlers/receipts.py
@@ -14,7 +14,7 @@
 import logging
 from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
 
-from synapse.api.constants import ReceiptTypes
+from synapse.api.constants import EduTypes, ReceiptTypes
 from synapse.appservice import ApplicationService
 from synapse.streams import EventSource
 from synapse.types import (
@@ -52,11 +52,11 @@ class ReceiptsHandler:
         # to the appropriate worker.
         if hs.get_instance_name() in hs.config.worker.writers.receipts:
             hs.get_federation_registry().register_edu_handler(
-                "m.receipt", self._received_remote_receipt
+                EduTypes.RECEIPT, self._received_remote_receipt
             )
         else:
             hs.get_federation_registry().register_instances_for_edu(
-                "m.receipt",
+                EduTypes.RECEIPT,
                 hs.config.worker.writers.receipts,
             )
 
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index bb00750bf..0aeab86bb 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -17,6 +17,7 @@ from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Set, Tuple
 
 import attr
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import AuthError, ShadowBanError, SynapseError
 from synapse.appservice import ApplicationService
 from synapse.metrics.background_process_metrics import (
@@ -68,7 +69,7 @@ class FollowerTypingHandler:
 
         if hs.get_instance_name() not in hs.config.worker.writers.typing:
             hs.get_federation_registry().register_instances_for_edu(
-                "m.typing",
+                EduTypes.TYPING,
                 hs.config.worker.writers.typing,
             )
 
@@ -143,7 +144,7 @@ class FollowerTypingHandler:
                     logger.debug("sending typing update to %s", domain)
                     self.federation.build_and_send_edu(
                         destination=domain,
-                        edu_type="m.typing",
+                        edu_type=EduTypes.TYPING,
                         content={
                             "room_id": member.room_id,
                             "user_id": member.user_id,
@@ -218,7 +219,9 @@ class TypingWriterHandler(FollowerTypingHandler):
 
         self.hs = hs
 
-        hs.get_federation_registry().register_edu_handler("m.typing", self._recv_edu)
+        hs.get_federation_registry().register_edu_handler(
+            EduTypes.TYPING, self._recv_edu
+        )
 
         hs.get_distributor().observe("user_left_room", self.user_left_room)
 
@@ -458,7 +461,7 @@ class TypingNotificationEventSource(EventSource[int, JsonDict]):
     def _make_event_for(self, room_id: str) -> JsonDict:
         typing = self.get_typing_handler()._room_typing[room_id]
         return {
-            "type": "m.typing",
+            "type": EduTypes.TYPING,
             "room_id": room_id,
             "content": {"user_ids": list(typing)},
         }
diff --git a/synapse/notifier.py b/synapse/notifier.py
index ba23257f5..c2b66eec6 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -33,7 +33,7 @@ from prometheus_client import Counter
 
 from twisted.internet import defer
 
-from synapse.api.constants import EventTypes, HistoryVisibility, Membership
+from synapse.api.constants import EduTypes, EventTypes, HistoryVisibility, Membership
 from synapse.api.errors import AuthError
 from synapse.events import EventBase
 from synapse.handlers.presence import format_user_presence_state
@@ -632,7 +632,7 @@ class Notifier:
                     now = self.clock.time_msec()
                     new_events[:] = [
                         {
-                            "type": "m.presence",
+                            "type": EduTypes.PRESENCE,
                             "content": format_user_presence_state(event, now),
                         }
                         for event in new_events
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index f596b792f..8bbf35148 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -16,7 +16,7 @@ import logging
 from collections import defaultdict
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
 
-from synapse.api.constants import Membership, PresenceState
+from synapse.api.constants import EduTypes, Membership, PresenceState
 from synapse.api.errors import Codes, StoreError, SynapseError
 from synapse.api.filtering import FilterCollection
 from synapse.api.presence import UserPresenceState
@@ -305,7 +305,7 @@ class SyncRestServlet(RestServlet):
         return {
             "events": [
                 {
-                    "type": "m.presence",
+                    "type": EduTypes.PRESENCE,
                     "sender": event.user_id,
                     "content": format_user_presence_state(
                         event, time_now, include_user_id=False
diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py
index 2df4dd4ed..dd43bae78 100644
--- a/synapse/storage/databases/main/devices.py
+++ b/synapse/storage/databases/main/devices.py
@@ -28,6 +28,7 @@ from typing import (
     cast,
 )
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import Codes, StoreError
 from synapse.logging.opentracing import (
     get_active_span_text_map,
@@ -419,7 +420,7 @@ class DeviceWorkerStore(SQLBaseStore):
         # Add the updated cross-signing keys to the results list
         for user_id, result in cross_signing_keys_by_user.items():
             result["user_id"] = user_id
-            results.append(("m.signing_key_update", result))
+            results.append((EduTypes.SIGNING_KEY_UPDATE, result))
             # also send the unstable version
             # FIXME: remove this when enough servers have upgraded
             #        and remove the length budgeting above.
@@ -545,7 +546,7 @@ class DeviceWorkerStore(SQLBaseStore):
                 else:
                     result["deleted"] = True
 
-                results.append(("m.device_list_update", result))
+                results.append((EduTypes.DEVICE_LIST_UPDATE, result))
 
         return results
 
diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py
index cfa4d4924..f74aa1e3f 100644
--- a/synapse/storage/databases/main/receipts.py
+++ b/synapse/storage/databases/main/receipts.py
@@ -26,7 +26,7 @@ from typing import (
     cast,
 )
 
-from synapse.api.constants import ReceiptTypes
+from synapse.api.constants import EduTypes, ReceiptTypes
 from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
 from synapse.replication.tcp.streams import ReceiptsStream
 from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
@@ -363,7 +363,7 @@ class ReceiptsWorkerStore(SQLBaseStore):
                 row["user_id"]
             ] = db_to_json(row["data"])
 
-        return [{"type": "m.receipt", "room_id": room_id, "content": content}]
+        return [{"type": EduTypes.RECEIPT, "room_id": room_id, "content": content}]
 
     @cachedList(
         cached_method_name="_get_linearized_receipts_for_room",
@@ -411,7 +411,7 @@ class ReceiptsWorkerStore(SQLBaseStore):
             # receipts by room, event and type.
             room_event = results.setdefault(
                 row["room_id"],
-                {"type": "m.receipt", "room_id": row["room_id"], "content": {}},
+                {"type": EduTypes.RECEIPT, "room_id": row["room_id"], "content": {}},
             )
 
             # The content is of the form:
@@ -476,7 +476,7 @@ class ReceiptsWorkerStore(SQLBaseStore):
             # receipts by room, event and type.
             room_event = results.setdefault(
                 row["room_id"],
-                {"type": "m.receipt", "room_id": row["room_id"], "content": {}},
+                {"type": EduTypes.RECEIPT, "room_id": row["room_id"], "content": {}},
             )
 
             # The content is of the form:
diff --git a/tests/api/test_filtering.py b/tests/api/test_filtering.py
index 985d6e397..a269c477f 100644
--- a/tests/api/test_filtering.py
+++ b/tests/api/test_filtering.py
@@ -20,7 +20,7 @@ from unittest.mock import patch
 import jsonschema
 from frozendict import frozendict
 
-from synapse.api.constants import EventContentFields
+from synapse.api.constants import EduTypes, EventContentFields
 from synapse.api.errors import SynapseError
 from synapse.api.filtering import Filter
 from synapse.events import make_event_from_dict
@@ -85,13 +85,13 @@ class FilteringTestCase(unittest.HomeserverTestCase):
                         "org.matrix.not_labels": ["#work"],
                     },
                     "ephemeral": {
-                        "types": ["m.receipt", "m.typing"],
+                        "types": [EduTypes.RECEIPT, EduTypes.TYPING],
                         "not_rooms": ["!726s6s6q:example.com"],
                         "not_senders": ["@spam:example.com"],
                     },
                 },
                 "presence": {
-                    "types": ["m.presence"],
+                    "types": [EduTypes.PRESENCE],
                     "not_senders": ["@alice:example.com"],
                 },
                 "event_format": "client",
diff --git a/tests/events/test_presence_router.py b/tests/events/test_presence_router.py
index 3deb14c30..ffc3012a8 100644
--- a/tests/events/test_presence_router.py
+++ b/tests/events/test_presence_router.py
@@ -439,7 +439,7 @@ class PresenceRouterTestCase(FederatingHomeserverTestCase):
 
             for edu in edus:
                 # Make sure we're only checking presence-type EDUs
-                if edu["edu_type"] != EduTypes.Presence:
+                if edu["edu_type"] != EduTypes.PRESENCE:
                     continue
 
                 # EDUs can contain multiple presence updates
diff --git a/tests/federation/test_federation_sender.py b/tests/federation/test_federation_sender.py
index 6b26353d5..b5be727fe 100644
--- a/tests/federation/test_federation_sender.py
+++ b/tests/federation/test_federation_sender.py
@@ -19,7 +19,7 @@ from signedjson.types import BaseKey, SigningKey
 
 from twisted.internet import defer
 
-from synapse.api.constants import RoomEncryptionAlgorithms
+from synapse.api.constants import EduTypes, RoomEncryptionAlgorithms
 from synapse.rest import admin
 from synapse.rest.client import login
 from synapse.types import JsonDict, ReadReceipt
@@ -63,7 +63,7 @@ class FederationSenderReceiptsTestCases(HomeserverTestCase):
             data["edus"],
             [
                 {
-                    "edu_type": "m.receipt",
+                    "edu_type": EduTypes.RECEIPT,
                     "content": {
                         "room_id": {
                             "m.read": {
@@ -103,7 +103,7 @@ class FederationSenderReceiptsTestCases(HomeserverTestCase):
             data["edus"],
             [
                 {
-                    "edu_type": "m.receipt",
+                    "edu_type": EduTypes.RECEIPT,
                     "content": {
                         "room_id": {
                             "m.read": {
@@ -138,7 +138,7 @@ class FederationSenderReceiptsTestCases(HomeserverTestCase):
             data["edus"],
             [
                 {
-                    "edu_type": "m.receipt",
+                    "edu_type": EduTypes.RECEIPT,
                     "content": {
                         "room_id": {
                             "m.read": {
@@ -322,8 +322,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
 
         # expect signing key update edu
         self.assertEqual(len(self.edus), 2)
-        self.assertEqual(self.edus.pop(0)["edu_type"], "m.signing_key_update")
-        self.assertEqual(self.edus.pop(0)["edu_type"], "org.matrix.signing_key_update")
+        self.assertEqual(self.edus.pop(0)["edu_type"], EduTypes.SIGNING_KEY_UPDATE)
+        self.assertEqual(
+            self.edus.pop(0)["edu_type"], EduTypes.UNSTABLE_SIGNING_KEY_UPDATE
+        )
 
         # sign the devices
         d1_json = build_device_dict(u1, "D1", device1_signing_key)
@@ -348,7 +350,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         self.assertEqual(len(self.edus), 2)
         stream_id = None  # FIXME: there is a discontinuity in the stream IDs: see #7142
         for edu in self.edus:
-            self.assertEqual(edu["edu_type"], "m.device_list_update")
+            self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
             c = edu["content"]
             if stream_id is not None:
                 self.assertEqual(c["prev_id"], [stream_id])
@@ -388,7 +390,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         # expect three edus, in an unknown order
         self.assertEqual(len(self.edus), 3)
         for edu in self.edus:
-            self.assertEqual(edu["edu_type"], "m.device_list_update")
+            self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
             c = edu["content"]
             self.assertGreaterEqual(
                 c.items(),
@@ -435,7 +437,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         self.assertEqual(len(self.edus), 3)
         stream_id = None
         for edu in self.edus:
-            self.assertEqual(edu["edu_type"], "m.device_list_update")
+            self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
             c = edu["content"]
             self.assertEqual(c["prev_id"], [stream_id] if stream_id is not None else [])
             if stream_id is not None:
@@ -487,7 +489,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         # there should be a single update for this user.
         self.assertEqual(len(self.edus), 1)
         edu = self.edus.pop(0)
-        self.assertEqual(edu["edu_type"], "m.device_list_update")
+        self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
         c = edu["content"]
 
         # synapse uses an empty prev_id list to indicate "needs a full resync".
@@ -544,7 +546,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         # ... and we should get a single update for this user.
         self.assertEqual(len(self.edus), 1)
         edu = self.edus.pop(0)
-        self.assertEqual(edu["edu_type"], "m.device_list_update")
+        self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
         c = edu["content"]
 
         # synapse uses an empty prev_id list to indicate "needs a full resync".
@@ -560,7 +562,7 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         """Check that the given EDU is an update for the given device
         Returns the stream_id.
         """
-        self.assertEqual(edu["edu_type"], "m.device_list_update")
+        self.assertEqual(edu["edu_type"], EduTypes.DEVICE_LIST_UPDATE)
         content = edu["content"]
 
         expected = {
diff --git a/tests/federation/transport/test_server.py b/tests/federation/transport/test_server.py
index 5f001c33b..cfd550a04 100644
--- a/tests/federation/transport/test_server.py
+++ b/tests/federation/transport/test_server.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from synapse.api.constants import EduTypes
+
 from tests import unittest
 from tests.unittest import DEBUG, override_config
 
@@ -50,7 +52,7 @@ class RoomDirectoryFederationTests(unittest.FederatingHomeserverTestCase):
             "/_matrix/federation/v1/send/txn_id_1234/",
             content={
                 "edus": [
-                    {"edu_type": "m.device_list_update", "content": {"foo": "bar"}}
+                    {"edu_type": EduTypes.DEVICE_LIST_UPDATE, "content": {"foo": "bar"}}
                 ],
                 "pdus": [],
             },
diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py
index 53e7a5d81..0e100c404 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -22,6 +22,7 @@ from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 import synapse.storage
+from synapse.api.constants import EduTypes
 from synapse.appservice import (
     ApplicationService,
     TransactionOneTimeKeyCounts,
@@ -476,7 +477,7 @@ class ApplicationServicesHandlerSendEventsTestCase(unittest.HomeserverTestCase):
 
         # Check that the ephemeral event is a read receipt with the expected structure
         latest_read_receipt = all_ephemeral_events[-1]
-        self.assertEqual(latest_read_receipt["type"], "m.receipt")
+        self.assertEqual(latest_read_receipt["type"], EduTypes.RECEIPT)
 
         event_id = list(latest_read_receipt["content"].keys())[0]
         self.assertEqual(
diff --git a/tests/handlers/test_receipts.py b/tests/handlers/test_receipts.py
index 78807cdcf..a95868b5c 100644
--- a/tests/handlers/test_receipts.py
+++ b/tests/handlers/test_receipts.py
@@ -15,7 +15,7 @@
 from copy import deepcopy
 from typing import List
 
-from synapse.api.constants import ReceiptTypes
+from synapse.api.constants import EduTypes, ReceiptTypes
 from synapse.types import JsonDict
 
 from tests import unittest
@@ -39,7 +39,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
             [],
@@ -64,7 +64,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
             [
@@ -79,7 +79,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
         )
@@ -105,7 +105,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
             [
@@ -120,7 +120,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
         )
@@ -140,7 +140,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
             [
@@ -155,7 +155,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
         )
@@ -174,7 +174,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 },
                 {
                     "content": {
@@ -187,7 +187,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 },
             ],
             [
@@ -202,7 +202,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
         )
@@ -224,7 +224,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 },
             ],
             [
@@ -237,7 +237,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 },
             ],
         )
@@ -266,7 +266,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         },
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
             [
@@ -291,7 +291,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                    "type": "m.receipt",
+                    "type": EduTypes.RECEIPT,
                 }
             ],
         )
@@ -310,7 +310,7 @@ class ReceiptsTestCase(unittest.HomeserverTestCase):
                     }
                 },
                 "room_id": "!jEsUZKDJdhlrceRyVU:example.org",
-                "type": "m.receipt",
+                "type": EduTypes.RECEIPT,
             }
         ]
         original_events = deepcopy(events)
diff --git a/tests/handlers/test_typing.py b/tests/handlers/test_typing.py
index 5f2e26a5f..057256cec 100644
--- a/tests/handlers/test_typing.py
+++ b/tests/handlers/test_typing.py
@@ -21,6 +21,7 @@ from twisted.internet import defer
 from twisted.test.proto_helpers import MemoryReactor
 from twisted.web.resource import Resource
 
+from synapse.api.constants import EduTypes
 from synapse.api.errors import AuthError
 from synapse.federation.transport.server import TransportLayerServer
 from synapse.server import HomeServer
@@ -184,7 +185,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": ROOM_ID,
                     "content": {"user_ids": [U_APPLE.to_string()]},
                 }
@@ -209,7 +210,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             "farm",
             path="/_matrix/federation/v1/send/1000000",
             data=_expect_edu_transaction(
-                "m.typing",
+                EduTypes.TYPING,
                 content={
                     "room_id": ROOM_ID,
                     "user_id": U_APPLE.to_string(),
@@ -231,7 +232,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             "PUT",
             "/_matrix/federation/v1/send/1000000",
             _make_edu_transaction_json(
-                "m.typing",
+                EduTypes.TYPING,
                 content={
                     "room_id": ROOM_ID,
                     "user_id": U_ONION.to_string(),
@@ -254,7 +255,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": ROOM_ID,
                     "content": {"user_ids": [U_ONION.to_string()]},
                 }
@@ -270,7 +271,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             "PUT",
             "/_matrix/federation/v1/send/1000000",
             _make_edu_transaction_json(
-                "m.typing",
+                EduTypes.TYPING,
                 content={
                     "room_id": OTHER_ROOM_ID,
                     "user_id": U_ONION.to_string(),
@@ -324,7 +325,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             "farm",
             path="/_matrix/federation/v1/send/1000000",
             data=_expect_edu_transaction(
-                "m.typing",
+                EduTypes.TYPING,
                 content={
                     "room_id": ROOM_ID,
                     "user_id": U_APPLE.to_string(),
@@ -345,7 +346,13 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(
             events[0],
-            [{"type": "m.typing", "room_id": ROOM_ID, "content": {"user_ids": []}}],
+            [
+                {
+                    "type": EduTypes.TYPING,
+                    "room_id": ROOM_ID,
+                    "content": {"user_ids": []},
+                }
+            ],
         )
 
     def test_typing_timeout(self) -> None:
@@ -379,7 +386,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": ROOM_ID,
                     "content": {"user_ids": [U_APPLE.to_string()]},
                 }
@@ -402,7 +409,13 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(
             events[0],
-            [{"type": "m.typing", "room_id": ROOM_ID, "content": {"user_ids": []}}],
+            [
+                {
+                    "type": EduTypes.TYPING,
+                    "room_id": ROOM_ID,
+                    "content": {"user_ids": []},
+                }
+            ],
         )
 
         # SYN-230 - see if we can still set after timeout
@@ -433,7 +446,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": ROOM_ID,
                     "content": {"user_ids": [U_APPLE.to_string()]},
                 }
diff --git a/tests/module_api/test_api.py b/tests/module_api/test_api.py
index 8bc84aaac..169e29b59 100644
--- a/tests/module_api/test_api.py
+++ b/tests/module_api/test_api.py
@@ -399,7 +399,7 @@ class ModuleApiTestCase(HomeserverTestCase):
 
             for edu in edus:
                 # Make sure we're only checking presence-type EDUs
-                if edu["edu_type"] != EduTypes.Presence:
+                if edu["edu_type"] != EduTypes.PRESENCE:
                     continue
 
                 # EDUs can contain multiple presence updates
diff --git a/tests/rest/client/test_events.py b/tests/rest/client/test_events.py
index 1b1392fa2..a9b7db9db 100644
--- a/tests/rest/client/test_events.py
+++ b/tests/rest/client/test_events.py
@@ -19,6 +19,7 @@ from unittest.mock import Mock
 from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
+from synapse.api.constants import EduTypes
 from synapse.rest.client import events, login, room
 from synapse.server import HomeServer
 from synapse.util import Clock
@@ -103,7 +104,7 @@ class EventStreamPermissionsTestCase(unittest.HomeserverTestCase):
                     c
                     for c in channel.json_body["chunk"]
                     if not (
-                        c.get("type") == "m.presence"
+                        c.get("type") == EduTypes.PRESENCE
                         and c["content"].get("user_id") == self.user_id
                     )
                 ]
diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py
index d0197aca9..f523d89b8 100644
--- a/tests/rest/client/test_rooms.py
+++ b/tests/rest/client/test_rooms.py
@@ -26,6 +26,7 @@ from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 from synapse.api.constants import (
+    EduTypes,
     EventContentFields,
     EventTypes,
     Membership,
@@ -1412,7 +1413,7 @@ class RoomInitialSyncTestCase(RoomBase):
             e["content"]["user_id"]: e for e in channel.json_body["presence"]
         }
         self.assertTrue(self.user_id in presence_by_user)
-        self.assertEqual("m.presence", presence_by_user[self.user_id]["type"])
+        self.assertEqual(EduTypes.PRESENCE, presence_by_user[self.user_id]["type"])
 
 
 class RoomMessageListTestCase(RoomBase):
diff --git a/tests/rest/client/test_sendtodevice.py b/tests/rest/client/test_sendtodevice.py
index c3942889e..6435800fa 100644
--- a/tests/rest/client/test_sendtodevice.py
+++ b/tests/rest/client/test_sendtodevice.py
@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from synapse.api.constants import EduTypes
 from synapse.rest import admin
 from synapse.rest.client import login, sendtodevice, sync
 
@@ -139,7 +140,7 @@ class SendToDeviceTestCase(HomeserverTestCase):
         for i in range(3):
             self.get_success(
                 federation_registry.on_edu(
-                    "m.direct_to_device",
+                    EduTypes.DIRECT_TO_DEVICE,
                     "remote_server",
                     {
                         "sender": "@user:remote_server",
@@ -172,7 +173,7 @@ class SendToDeviceTestCase(HomeserverTestCase):
         # and we can send more messages
         self.get_success(
             federation_registry.on_edu(
-                "m.direct_to_device",
+                EduTypes.DIRECT_TO_DEVICE,
                 "remote_server",
                 {
                     "sender": "@user:remote_server",
diff --git a/tests/rest/client/test_shadow_banned.py b/tests/rest/client/test_shadow_banned.py
index ae5ada3be..d9bd8c4a2 100644
--- a/tests/rest/client/test_shadow_banned.py
+++ b/tests/rest/client/test_shadow_banned.py
@@ -17,7 +17,7 @@ from unittest.mock import Mock, patch
 from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
-from synapse.api.constants import EventTypes
+from synapse.api.constants import EduTypes, EventTypes
 from synapse.rest.client import (
     directory,
     login,
@@ -226,7 +226,7 @@ class RoomTestCase(_ShadowBannedBase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": room_id,
                     "content": {"user_ids": [self.other_user_id]},
                 }
diff --git a/tests/rest/client/test_sync.py b/tests/rest/client/test_sync.py
index 74b6560cb..e3efd1f1b 100644
--- a/tests/rest/client/test_sync.py
+++ b/tests/rest/client/test_sync.py
@@ -22,6 +22,7 @@ from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 from synapse.api.constants import (
+    EduTypes,
     EventContentFields,
     EventTypes,
     ReceiptTypes,
@@ -504,7 +505,7 @@ class ReadReceiptsTestCase(unittest.HomeserverTestCase):
 
         # Checks if event is a read receipt
         def is_read_receipt(event: JsonDict) -> bool:
-            return event["type"] == "m.receipt"
+            return event["type"] == EduTypes.RECEIPT
 
         # Sync
         channel = self.make_request(
diff --git a/tests/rest/client/test_typing.py b/tests/rest/client/test_typing.py
index d6da51077..61b66d768 100644
--- a/tests/rest/client/test_typing.py
+++ b/tests/rest/client/test_typing.py
@@ -17,6 +17,7 @@
 
 from twisted.test.proto_helpers import MemoryReactor
 
+from synapse.api.constants import EduTypes
 from synapse.rest.client import room
 from synapse.server import HomeServer
 from synapse.types import UserID
@@ -67,7 +68,7 @@ class RoomTypingTestCase(unittest.HomeserverTestCase):
             events[0],
             [
                 {
-                    "type": "m.typing",
+                    "type": EduTypes.TYPING,
                     "room_id": self.room_id,
                     "content": {"user_ids": [self.user_id]},
                 }
diff --git a/tests/storage/test_devices.py b/tests/storage/test_devices.py
index bbf079b25..f37505b6c 100644
--- a/tests/storage/test_devices.py
+++ b/tests/storage/test_devices.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import synapse.api.errors
+from synapse.api.constants import EduTypes
 
 from tests.unittest import HomeserverTestCase
 
@@ -266,10 +267,12 @@ class DeviceStoreTestCase(HomeserverTestCase):
         # (This is a temporary arrangement for backwards compatibility!)
         self.assertEqual(len(device_updates), 2, device_updates)
         self.assertEqual(
-            device_updates[0][0], "m.signing_key_update", device_updates[0]
+            device_updates[0][0], EduTypes.SIGNING_KEY_UPDATE, device_updates[0]
         )
         self.assertEqual(
-            device_updates[1][0], "org.matrix.signing_key_update", device_updates[1]
+            device_updates[1][0],
+            EduTypes.UNSTABLE_SIGNING_KEY_UPDATE,
+            device_updates[1],
         )
 
         # Check there are no more device updates left.