diff --git a/changelog.d/12650.misc b/changelog.d/12650.misc
new file mode 100644
index 000000000000..07bb4ce5a91a
--- /dev/null
+++ b/changelog.d/12650.misc
@@ -0,0 +1 @@
+Update to mypy 0.950.
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 89e78576b7b6..564ba7ec02c4 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -572,7 +572,7 @@ python-versions = "*"
 
 [[package]]
 name = "mypy"
-version = "0.931"
+version = "0.950"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
@@ -580,13 +580,14 @@ python-versions = ">=3.6"
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3"
-tomli = ">=1.1.0"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typed-ast = {version = ">=1.4.0,<2", markers = "python_version < \"3.8\""}
 typing-extensions = ">=3.10"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
 python2 = ["typed-ast (>=1.4.0,<2)"]
+reports = ["lxml"]
 
 [[package]]
 name = "mypy-extensions"
@@ -598,14 +599,14 @@ python-versions = "*"
 
 [[package]]
 name = "mypy-zope"
-version = "0.3.5"
+version = "0.3.7"
 description = "Plugin for mypy to support zope interfaces"
 category = "dev"
 optional = false
 python-versions = "*"
 
 [package.dependencies]
-mypy = "0.931"
+mypy = "0.950"
 "zope.interface" = "*"
 "zope.schema" = "*"
 
@@ -1020,7 +1021,7 @@ jeepney = ">=0.6"
 
 [[package]]
 name = "sentry-sdk"
-version = "1.5.7"
+version = "1.5.11"
 description = "Python client for Sentry (https://sentry.io)"
 category = "main"
 optional = true
@@ -1562,7 +1563,7 @@ url_preview = ["lxml"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7.1"
-content-hash = "2bda1a7cfc8cc02832b4a7d16bf7e1615cb05e0639bdb30688aadf692d851942"
+content-hash = "f24699464828ac1a63f1034b4a18c841ef585737b9a802fd8311836444f1d702"
 
 [metadata.files]
 attrs = [
@@ -2089,34 +2090,37 @@ msgpack = [
     {file = "msgpack-1.0.3.tar.gz", hash = "sha256:51fdc7fb93615286428ee7758cecc2f374d5ff363bdd884c7ea622a7a327a81e"},
 ]
 mypy = [
-    {file = "mypy-0.931-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:3c5b42d0815e15518b1f0990cff7a705805961613e701db60387e6fb663fe78a"},
-    {file = "mypy-0.931-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:c89702cac5b302f0c5d33b172d2b55b5df2bede3344a2fbed99ff96bddb2cf00"},
-    {file = "mypy-0.931-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:300717a07ad09525401a508ef5d105e6b56646f7942eb92715a1c8d610149714"},
-    {file = "mypy-0.931-cp310-cp310-win_amd64.whl", hash = "sha256:7b3f6f557ba4afc7f2ce6d3215d5db279bcf120b3cfd0add20a5d4f4abdae5bc"},
-    {file = "mypy-0.931-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:1bf752559797c897cdd2c65f7b60c2b6969ffe458417b8d947b8340cc9cec08d"},
-    {file = "mypy-0.931-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:4365c60266b95a3f216a3047f1d8e3f895da6c7402e9e1ddfab96393122cc58d"},
-    {file = "mypy-0.931-cp36-cp36m-win_amd64.whl", hash = "sha256:1b65714dc296a7991000b6ee59a35b3f550e0073411ac9d3202f6516621ba66c"},
-    {file = "mypy-0.931-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e839191b8da5b4e5d805f940537efcaa13ea5dd98418f06dc585d2891d228cf0"},
-    {file = "mypy-0.931-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:50c7346a46dc76a4ed88f3277d4959de8a2bd0a0fa47fa87a4cde36fe247ac05"},
-    {file = "mypy-0.931-cp37-cp37m-win_amd64.whl", hash = "sha256:d8f1ff62f7a879c9fe5917b3f9eb93a79b78aad47b533911b853a757223f72e7"},
-    {file = "mypy-0.931-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:f9fe20d0872b26c4bba1c1be02c5340de1019530302cf2dcc85c7f9fc3252ae0"},
-    {file = "mypy-0.931-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:1b06268df7eb53a8feea99cbfff77a6e2b205e70bf31743e786678ef87ee8069"},
-    {file = "mypy-0.931-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:8c11003aaeaf7cc2d0f1bc101c1cc9454ec4cc9cb825aef3cafff8a5fdf4c799"},
-    {file = "mypy-0.931-cp38-cp38-win_amd64.whl", hash = "sha256:d9d2b84b2007cea426e327d2483238f040c49405a6bf4074f605f0156c91a47a"},
-    {file = "mypy-0.931-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:ff3bf387c14c805ab1388185dd22d6b210824e164d4bb324b195ff34e322d166"},
-    {file = "mypy-0.931-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:5b56154f8c09427bae082b32275a21f500b24d93c88d69a5e82f3978018a0266"},
-    {file = "mypy-0.931-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:8ca7f8c4b1584d63c9a0f827c37ba7a47226c19a23a753d52e5b5eddb201afcd"},
-    {file = "mypy-0.931-cp39-cp39-win_amd64.whl", hash = "sha256:74f7eccbfd436abe9c352ad9fb65872cc0f1f0a868e9d9c44db0893440f0c697"},
-    {file = "mypy-0.931-py3-none-any.whl", hash = "sha256:1171f2e0859cfff2d366da2c7092b06130f232c636a3f7301e3feb8b41f6377d"},
-    {file = "mypy-0.931.tar.gz", hash = "sha256:0038b21890867793581e4cb0d810829f5fd4441aa75796b53033af3aa30430ce"},
+    {file = "mypy-0.950-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:cf9c261958a769a3bd38c3e133801ebcd284ffb734ea12d01457cb09eacf7d7b"},
+    {file = "mypy-0.950-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:b5b5bd0ffb11b4aba2bb6d31b8643902c48f990cc92fda4e21afac658044f0c0"},
+    {file = "mypy-0.950-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:5e7647df0f8fc947388e6251d728189cfadb3b1e558407f93254e35abc026e22"},
+    {file = "mypy-0.950-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:eaff8156016487c1af5ffa5304c3e3fd183edcb412f3e9c72db349faf3f6e0eb"},
+    {file = "mypy-0.950-cp310-cp310-win_amd64.whl", hash = "sha256:563514c7dc504698fb66bb1cf897657a173a496406f1866afae73ab5b3cdb334"},
+    {file = "mypy-0.950-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:dd4d670eee9610bf61c25c940e9ade2d0ed05eb44227275cce88701fee014b1f"},
+    {file = "mypy-0.950-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:ca75ecf2783395ca3016a5e455cb322ba26b6d33b4b413fcdedfc632e67941dc"},
+    {file = "mypy-0.950-cp36-cp36m-win_amd64.whl", hash = "sha256:6003de687c13196e8a1243a5e4bcce617d79b88f83ee6625437e335d89dfebe2"},
+    {file = "mypy-0.950-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:4c653e4846f287051599ed8f4b3c044b80e540e88feec76b11044ddc5612ffed"},
+    {file = "mypy-0.950-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:e19736af56947addedce4674c0971e5dceef1b5ec7d667fe86bcd2b07f8f9075"},
+    {file = "mypy-0.950-cp37-cp37m-win_amd64.whl", hash = "sha256:ef7beb2a3582eb7a9f37beaf38a28acfd801988cde688760aea9e6cc4832b10b"},
+    {file = "mypy-0.950-cp38-cp38-macosx_10_9_universal2.whl", hash = "sha256:0112752a6ff07230f9ec2f71b0d3d4e088a910fdce454fdb6553e83ed0eced7d"},
+    {file = "mypy-0.950-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:ee0a36edd332ed2c5208565ae6e3a7afc0eabb53f5327e281f2ef03a6bc7687a"},
+    {file = "mypy-0.950-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:77423570c04aca807508a492037abbd72b12a1fb25a385847d191cd50b2c9605"},
+    {file = "mypy-0.950-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:5ce6a09042b6da16d773d2110e44f169683d8cc8687e79ec6d1181a72cb028d2"},
+    {file = "mypy-0.950-cp38-cp38-win_amd64.whl", hash = "sha256:5b231afd6a6e951381b9ef09a1223b1feabe13625388db48a8690f8daa9b71ff"},
+    {file = "mypy-0.950-cp39-cp39-macosx_10_9_universal2.whl", hash = "sha256:0384d9f3af49837baa92f559d3fa673e6d2652a16550a9ee07fc08c736f5e6f8"},
+    {file = "mypy-0.950-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:1fdeb0a0f64f2a874a4c1f5271f06e40e1e9779bf55f9567f149466fc7a55038"},
+    {file = "mypy-0.950-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:61504b9a5ae166ba5ecfed9e93357fd51aa693d3d434b582a925338a2ff57fd2"},
+    {file = "mypy-0.950-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:a952b8bc0ae278fc6316e6384f67bb9a396eb30aced6ad034d3a76120ebcc519"},
+    {file = "mypy-0.950-cp39-cp39-win_amd64.whl", hash = "sha256:eaea21d150fb26d7b4856766e7addcf929119dd19fc832b22e71d942835201ef"},
+    {file = "mypy-0.950-py3-none-any.whl", hash = "sha256:a4d9898f46446bfb6405383b57b96737dcfd0a7f25b748e78ef3e8c576bba3cb"},
+    {file = "mypy-0.950.tar.gz", hash = "sha256:1b333cfbca1762ff15808a0ef4f71b5d3eed8528b23ea1c3fb50543c867d68de"},
 ]
 mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
     {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
 ]
 mypy-zope = [
-    {file = "mypy-zope-0.3.5.tar.gz", hash = "sha256:489e7da1c2af887f2cfe3496995fc247f296512b495b57817edddda9d22308f3"},
-    {file = "mypy_zope-0.3.5-py3-none-any.whl", hash = "sha256:3bd0cc9a3e5933b02931af4b214ba32a4f4ff98adb30c979ce733857db91a18b"},
+    {file = "mypy-zope-0.3.7.tar.gz", hash = "sha256:9da171e78e8ef7ac8922c86af1a62f1b7f3244f121020bd94a2246bc3f33c605"},
+    {file = "mypy_zope-0.3.7-py3-none-any.whl", hash = "sha256:9c7637d066e4d1bafa0651abc091c752009769098043b236446e6725be2bc9c2"},
 ]
 netaddr = [
     {file = "netaddr-0.8.0-py2.py3-none-any.whl", hash = "sha256:9666d0232c32d2656e5e5f8d735f58fd6c7457ce52fc21c98d45f2af78f990ac"},
@@ -2386,8 +2390,8 @@ secretstorage = [
     {file = "SecretStorage-3.3.1.tar.gz", hash = "sha256:fd666c51a6bf200643495a04abb261f83229dcb6fd8472ec393df7ffc8b6f195"},
 ]
 sentry-sdk = [
-    {file = "sentry-sdk-1.5.7.tar.gz", hash = "sha256:aa52da941c56b5a76fd838f8e9e92a850bf893a9eb1e33ffce6c21431d07ee30"},
-    {file = "sentry_sdk-1.5.7-py2.py3-none-any.whl", hash = "sha256:411a8495bd18cf13038e5749e4710beb4efa53da6351f67b4c2f307c2d9b6d49"},
+    {file = "sentry-sdk-1.5.11.tar.gz", hash = "sha256:6c01d9d0b65935fd275adc120194737d1df317dce811e642cbf0394d0d37a007"},
+    {file = "sentry_sdk-1.5.11-py2.py3-none-any.whl", hash = "sha256:c17179183cac614e900cbd048dab03f49a48e2820182ec686c25e7ce46f8548f"},
 ]
 service-identity = [
     {file = "service-identity-21.1.0.tar.gz", hash = "sha256:6e6c6086ca271dc11b033d17c3a8bea9f24ebff920c587da090afc9519419d34"},
diff --git a/pyproject.toml b/pyproject.toml
index 446895711b01..877f19708d37 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -248,8 +248,8 @@ flake8-bugbear = "==21.3.2"
 flake8 = "*"
 
 # Typechecking
-mypy = "==0.931"
-mypy-zope = "==0.3.5"
+mypy = "*"
+mypy-zope = "*"
 types-bleach = ">=4.1.0"
 types-commonmark = ">=0.9.2"
 types-jsonschema = ">=3.2.0"
diff --git a/stubs/sortedcontainers/sorteddict.pyi b/stubs/sortedcontainers/sorteddict.pyi
index 3a4f9c307685..7c399ab38d5e 100644
--- a/stubs/sortedcontainers/sorteddict.pyi
+++ b/stubs/sortedcontainers/sorteddict.pyi
@@ -85,12 +85,19 @@ class SortedDict(Dict[_KT, _VT]):
     def popitem(self, index: int = ...) -> Tuple[_KT, _VT]: ...
     def peekitem(self, index: int = ...) -> Tuple[_KT, _VT]: ...
     def setdefault(self, key: _KT, default: Optional[_VT] = ...) -> _VT: ...
-    @overload
-    def update(self, __map: Mapping[_KT, _VT], **kwargs: _VT) -> None: ...
-    @overload
-    def update(self, __iterable: Iterable[Tuple[_KT, _VT]], **kwargs: _VT) -> None: ...
-    @overload
-    def update(self, **kwargs: _VT) -> None: ...
+    # Mypy now reports the first overload as an error, because typeshed widened the type
+    # of `__map` to its internal `_typeshed.SupportsKeysAndGetItem` type in
+    #   https://github.com/python/typeshed/pull/6653
+    # Since sorteddicts don't change the signature of `update` from that of `dict`, we
+    # let the stubs for `update` inherit from the stubs for `dict`. (I suspect we could
+    # do the same for many othe methods.) We leave the stubs commented to better track
+    # how this file has evolved from the original stubs.
+    # @overload
+    # def update(self, __map: Mapping[_KT, _VT], **kwargs: _VT) -> None: ...
+    # @overload
+    # def update(self, __iterable: Iterable[Tuple[_KT, _VT]], **kwargs: _VT) -> None: ...
+    # @overload
+    # def update(self, **kwargs: _VT) -> None: ...
     def __reduce__(
         self,
     ) -> Tuple[
diff --git a/synapse/appservice/api.py b/synapse/appservice/api.py
index adc6b074dae6..d19f8dd996b2 100644
--- a/synapse/appservice/api.py
+++ b/synapse/appservice/api.py
@@ -17,6 +17,7 @@
 from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple
 
 from prometheus_client import Counter
+from typing_extensions import TypeGuard
 
 from synapse.api.constants import EventTypes, Membership, ThirdPartyEntityKind
 from synapse.api.errors import CodeMessageException
@@ -66,7 +67,7 @@ def _is_valid_3pe_metadata(info: JsonDict) -> bool:
     return True
 
 
-def _is_valid_3pe_result(r: JsonDict, field: str) -> bool:
+def _is_valid_3pe_result(r: object, field: str) -> TypeGuard[JsonDict]:
     if not isinstance(r, dict):
         return False
 
diff --git a/synapse/config/appservice.py b/synapse/config/appservice.py
index 720b90a28386..99b7f584a869 100644
--- a/synapse/config/appservice.py
+++ b/synapse/config/appservice.py
@@ -56,7 +56,8 @@ def load_appservices(
 ) -> List[ApplicationService]:
     """Returns a list of Application Services from the config files."""
     if not isinstance(config_files, list):
-        logger.warning("Expected %s to be a list of AS config files.", config_files)
+        # type-ignore: this function gets arbitrary json value; we do use this path.
+        logger.warning("Expected %s to be a list of AS config files.", config_files)  # type: ignore[unreachable]
         return []
 
     # Dicts of value -> filename
diff --git a/synapse/events/presence_router.py b/synapse/events/presence_router.py
index a58f313e8b1c..98555c8c0c65 100644
--- a/synapse/events/presence_router.py
+++ b/synapse/events/presence_router.py
@@ -147,7 +147,9 @@ async def get_users_for_states(
         # run all the callbacks for get_users_for_states and combine the results
         for callback in self._get_users_for_states_callbacks:
             try:
-                result = await callback(state_updates)
+                # Note: result is an object here, because we don't trust modules to
+                # return the types they're supposed to.
+                result: object = await callback(state_updates)
             except Exception as e:
                 logger.warning("Failed to run module API callback %s: %s", callback, e)
                 continue
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 95a89ac01f4b..c28b792e6fe2 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1427,7 +1427,7 @@ async def persist_and_notify_client_event(
             # Validate a newly added alias or newly added alt_aliases.
 
             original_alias = None
-            original_alt_aliases: List[str] = []
+            original_alt_aliases: object = []
 
             original_event_id = event.unsigned.get("replaces_state")
             if original_event_id:
@@ -1455,6 +1455,7 @@ async def persist_and_notify_client_event(
             # If the old version of alt_aliases is of an unknown form,
             # completely replace it.
             if not isinstance(original_alt_aliases, (list, tuple)):
+                # TODO: check that the original_alt_aliases' entries are all strings
                 original_alt_aliases = []
 
             # Check that each alias is currently valid.
diff --git a/synapse/metrics/background_process_metrics.py b/synapse/metrics/background_process_metrics.py
index f61396bb79a9..298809742a94 100644
--- a/synapse/metrics/background_process_metrics.py
+++ b/synapse/metrics/background_process_metrics.py
@@ -28,11 +28,11 @@
     Type,
     TypeVar,
     Union,
-    cast,
 )
 
 from prometheus_client import Metric
 from prometheus_client.core import REGISTRY, Counter, Gauge
+from typing_extensions import ParamSpec
 
 from twisted.internet import defer
 
@@ -256,24 +256,48 @@ async def run() -> Optional[R]:
         return defer.ensureDeferred(run())
 
 
-F = TypeVar("F", bound=Callable[..., Awaitable[Optional[Any]]])
+P = ParamSpec("P")
 
 
-def wrap_as_background_process(desc: str) -> Callable[[F], F]:
-    """Decorator that wraps a function that gets called as a background
-    process.
+def wrap_as_background_process(
+    desc: str,
+) -> Callable[
+    [Callable[P, Awaitable[Optional[R]]]],
+    Callable[P, "defer.Deferred[Optional[R]]"],
+]:
+    """Decorator that wraps an asynchronous function `func`, returning a synchronous
+    decorated function. Calling the decorated version runs `func` as a background
+    process, forwarding all arguments verbatim.
+
+    That is,
+
+        @wrap_as_background_process
+        def func(*args): ...
+        func(1, 2, third=3)
+
+    is equivalent to:
+
+        def func(*args): ...
+        run_as_background_process(func, 1, 2, third=3)
 
-    Equivalent to calling the function with `run_as_background_process`
+    The former can be convenient if `func` needs to be run as a background process in
+    multiple places.
     """
 
-    def wrap_as_background_process_inner(func: F) -> F:
+    def wrap_as_background_process_inner(
+        func: Callable[P, Awaitable[Optional[R]]]
+    ) -> Callable[P, "defer.Deferred[Optional[R]]"]:
         @wraps(func)
         def wrap_as_background_process_inner_2(
-            *args: Any, **kwargs: Any
+            *args: P.args, **kwargs: P.kwargs
         ) -> "defer.Deferred[Optional[R]]":
-            return run_as_background_process(desc, func, *args, **kwargs)
+            # type-ignore: mypy is confusing kwargs with the bg_start_span kwarg.
+            #     Argument 4 to "run_as_background_process" has incompatible type
+            #     "**P.kwargs"; expected "bool"
+            # See https://github.com/python/mypy/issues/8862
+            return run_as_background_process(desc, func, *args, **kwargs)  # type: ignore[arg-type]
 
-        return cast(F, wrap_as_background_process_inner_2)
+        return wrap_as_background_process_inner_2
 
     return wrap_as_background_process_inner
 
diff --git a/tests/storage/test_monthly_active_users.py b/tests/storage/test_monthly_active_users.py
index 0fbf46567091..4c29ad79b643 100644
--- a/tests/storage/test_monthly_active_users.py
+++ b/tests/storage/test_monthly_active_users.py
@@ -222,10 +222,11 @@ def test_reap_monthly_active_users_reserved_users(self):
                     self.store.user_add_threepid(user, "email", email, now, now)
                 )
 
-        d = self.store.db_pool.runInteraction(
-            "initialise", self.store._initialise_reserved_users, threepids
+        self.get_success(
+            self.store.db_pool.runInteraction(
+                "initialise", self.store._initialise_reserved_users, threepids
+            )
         )
-        self.get_success(d)
 
         count = self.get_success(self.store.get_monthly_active_count())
         self.assertEqual(count, initial_users)
@@ -233,8 +234,7 @@ def test_reap_monthly_active_users_reserved_users(self):
         users = self.get_success(self.store.get_registered_reserved_users())
         self.assertEqual(len(users), reserved_user_number)
 
-        d = self.store.reap_monthly_active_users()
-        self.get_success(d)
+        self.get_success(self.store.reap_monthly_active_users())
 
         count = self.get_success(self.store.get_monthly_active_count())
         self.assertEqual(count, self.hs.config.server.max_mau_value)