diff --git a/requirements/dev.txt b/requirements/dev.txt
index 635b437789..48559e0c4e 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -665,21 +665,21 @@ mypy-extensions==0.4.3 \
     --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
     --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8 \
     # via mypy, typing-inspect
-mypy==0.782 \
-    --hash=sha256:2c6cde8aa3426c1682d35190b59b71f661237d74b053822ea3d748e2c9578a7c \
-    --hash=sha256:3fdda71c067d3ddfb21da4b80e2686b71e9e5c72cca65fa216d207a358827f86 \
-    --hash=sha256:5dd13ff1f2a97f94540fd37a49e5d255950ebcdf446fb597463a40d0df3fac8b \
-    --hash=sha256:6731603dfe0ce4352c555c6284c6db0dc935b685e9ce2e4cf220abe1e14386fd \
-    --hash=sha256:6bb93479caa6619d21d6e7160c552c1193f6952f0668cdda2f851156e85186fc \
-    --hash=sha256:81c7908b94239c4010e16642c9102bfc958ab14e36048fa77d0be3289dda76ea \
-    --hash=sha256:9c7a9a7ceb2871ba4bac1cf7217a7dd9ccd44c27c2950edbc6dc08530f32ad4e \
-    --hash=sha256:a4a2cbcfc4cbf45cd126f531dedda8485671545b43107ded25ce952aac6fb308 \
-    --hash=sha256:b7fbfabdbcc78c4f6fc4712544b9b0d6bf171069c6e0e3cb82440dd10ced3406 \
-    --hash=sha256:c05b9e4fb1d8a41d41dec8786c94f3b95d3c5f528298d769eb8e73d293abc48d \
-    --hash=sha256:d7df6eddb6054d21ca4d3c6249cae5578cb4602951fd2b6ee2f5510ffb098707 \
-    --hash=sha256:e0b61738ab504e656d1fe4ff0c0601387a5489ca122d55390ade31f9ca0e252d \
-    --hash=sha256:eff7d4a85e9eea55afa34888dfeaccde99e7520b51f867ac28a48492c0b1130c \
-    --hash=sha256:f05644db6779387ccdb468cc47a44b4356fc2ffa9287135d05b70a98dc83b89a \
+mypy==0.790 \
+    --hash=sha256:0a0d102247c16ce93c97066443d11e2d36e6cc2a32d8ccc1f705268970479324 \
+    --hash=sha256:0d34d6b122597d48a36d6c59e35341f410d4abfa771d96d04ae2c468dd201abc \
+    --hash=sha256:2170492030f6faa537647d29945786d297e4862765f0b4ac5930ff62e300d802 \
+    --hash=sha256:2842d4fbd1b12ab422346376aad03ff5d0805b706102e475e962370f874a5122 \
+    --hash=sha256:2b21ba45ad9ef2e2eb88ce4aeadd0112d0f5026418324176fd494a6824b74975 \
+    --hash=sha256:72060bf64f290fb629bd4a67c707a66fd88ca26e413a91384b18db3876e57ed7 \
+    --hash=sha256:af4e9ff1834e565f1baa74ccf7ae2564ae38c8df2a85b057af1dbbc958eb6666 \
+    --hash=sha256:bd03b3cf666bff8d710d633d1c56ab7facbdc204d567715cb3b9f85c6e94f669 \
+    --hash=sha256:c614194e01c85bb2e551c421397e49afb2872c88b5830e3554f0519f9fb1c178 \
+    --hash=sha256:cf4e7bf7f1214826cf7333627cb2547c0db7e3078723227820d0a2490f117a01 \
+    --hash=sha256:da56dedcd7cd502ccd3c5dddc656cb36113dd793ad466e894574125945653cea \
+    --hash=sha256:e86bdace26c5fe9cf8cb735e7cedfe7850ad92b327ac5d797c656717d2ca66de \
+    --hash=sha256:e97e9c13d67fbe524be17e4d8025d51a7dca38f90de2e462243ab8ed8a9178d1 \
+    --hash=sha256:eea260feb1830a627fb526d22fbb426b750d9f5a47b624e8d5e7e004359b219c \
     # via -r requirements/mypy.in
 networkx==2.5 \
     --hash=sha256:7978955423fbc9639c10498878be59caf99b44dc304c2286162fd24b458c1602 \
diff --git a/requirements/mypy.in b/requirements/mypy.in
index f5e4d63687..426161eaad 100644
--- a/requirements/mypy.in
+++ b/requirements/mypy.in
@@ -2,4 +2,4 @@
 # /tools/update-locked-requirements to update requirements/dev.txt
 # and requirements/mypy.txt.
 # See requirements/README.md for more detail.
-mypy==0.782
+mypy
diff --git a/requirements/mypy.txt b/requirements/mypy.txt
index 6908d2cb02..2f7d19075e 100644
--- a/requirements/mypy.txt
+++ b/requirements/mypy.txt
@@ -11,21 +11,21 @@ mypy-extensions==0.4.3 \
     --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
     --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8 \
     # via mypy
-mypy==0.782 \
-    --hash=sha256:2c6cde8aa3426c1682d35190b59b71f661237d74b053822ea3d748e2c9578a7c \
-    --hash=sha256:3fdda71c067d3ddfb21da4b80e2686b71e9e5c72cca65fa216d207a358827f86 \
-    --hash=sha256:5dd13ff1f2a97f94540fd37a49e5d255950ebcdf446fb597463a40d0df3fac8b \
-    --hash=sha256:6731603dfe0ce4352c555c6284c6db0dc935b685e9ce2e4cf220abe1e14386fd \
-    --hash=sha256:6bb93479caa6619d21d6e7160c552c1193f6952f0668cdda2f851156e85186fc \
-    --hash=sha256:81c7908b94239c4010e16642c9102bfc958ab14e36048fa77d0be3289dda76ea \
-    --hash=sha256:9c7a9a7ceb2871ba4bac1cf7217a7dd9ccd44c27c2950edbc6dc08530f32ad4e \
-    --hash=sha256:a4a2cbcfc4cbf45cd126f531dedda8485671545b43107ded25ce952aac6fb308 \
-    --hash=sha256:b7fbfabdbcc78c4f6fc4712544b9b0d6bf171069c6e0e3cb82440dd10ced3406 \
-    --hash=sha256:c05b9e4fb1d8a41d41dec8786c94f3b95d3c5f528298d769eb8e73d293abc48d \
-    --hash=sha256:d7df6eddb6054d21ca4d3c6249cae5578cb4602951fd2b6ee2f5510ffb098707 \
-    --hash=sha256:e0b61738ab504e656d1fe4ff0c0601387a5489ca122d55390ade31f9ca0e252d \
-    --hash=sha256:eff7d4a85e9eea55afa34888dfeaccde99e7520b51f867ac28a48492c0b1130c \
-    --hash=sha256:f05644db6779387ccdb468cc47a44b4356fc2ffa9287135d05b70a98dc83b89a \
+mypy==0.790 \
+    --hash=sha256:0a0d102247c16ce93c97066443d11e2d36e6cc2a32d8ccc1f705268970479324 \
+    --hash=sha256:0d34d6b122597d48a36d6c59e35341f410d4abfa771d96d04ae2c468dd201abc \
+    --hash=sha256:2170492030f6faa537647d29945786d297e4862765f0b4ac5930ff62e300d802 \
+    --hash=sha256:2842d4fbd1b12ab422346376aad03ff5d0805b706102e475e962370f874a5122 \
+    --hash=sha256:2b21ba45ad9ef2e2eb88ce4aeadd0112d0f5026418324176fd494a6824b74975 \
+    --hash=sha256:72060bf64f290fb629bd4a67c707a66fd88ca26e413a91384b18db3876e57ed7 \
+    --hash=sha256:af4e9ff1834e565f1baa74ccf7ae2564ae38c8df2a85b057af1dbbc958eb6666 \
+    --hash=sha256:bd03b3cf666bff8d710d633d1c56ab7facbdc204d567715cb3b9f85c6e94f669 \
+    --hash=sha256:c614194e01c85bb2e551c421397e49afb2872c88b5830e3554f0519f9fb1c178 \
+    --hash=sha256:cf4e7bf7f1214826cf7333627cb2547c0db7e3078723227820d0a2490f117a01 \
+    --hash=sha256:da56dedcd7cd502ccd3c5dddc656cb36113dd793ad466e894574125945653cea \
+    --hash=sha256:e86bdace26c5fe9cf8cb735e7cedfe7850ad92b327ac5d797c656717d2ca66de \
+    --hash=sha256:e97e9c13d67fbe524be17e4d8025d51a7dca38f90de2e462243ab8ed8a9178d1 \
+    --hash=sha256:eea260feb1830a627fb526d22fbb426b750d9f5a47b624e8d5e7e004359b219c \
     # via -r requirements/mypy.in
 typed-ast==1.4.1 \
     --hash=sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355 \
diff --git a/stubs/orjson.pyi b/stubs/orjson.pyi
deleted file mode 100644
index 6abc1c78a2..0000000000
--- a/stubs/orjson.pyi
+++ /dev/null
@@ -1,27 +0,0 @@
-# This can be deleted when orjson adds orjson.pyi and py.typed to the package,
-# or mypy releases with https://github.com/python/typeshed/pull/4405 included.
-
-from typing import Any, Callable, Optional, Union
-
-__version__: str
-
-def dumps(__obj: Any, default: Optional[Callable[[Any], Any]] = ..., option: Optional[int] = ...,) -> bytes: ...
-def loads(__obj: Union[bytes, bytearray, str]) -> Any: ...
-
-class JSONDecodeError(ValueError): ...
-class JSONEncodeError(TypeError): ...
-
-OPT_APPEND_NEWLINE: int
-OPT_INDENT_2: int
-OPT_NAIVE_UTC: int
-OPT_NON_STR_KEYS: int
-OPT_OMIT_MICROSECONDS: int
-OPT_PASSTHROUGH_DATACLASS: int
-OPT_PASSTHROUGH_DATETIME: int
-OPT_PASSTHROUGH_SUBCLASS: int
-OPT_SERIALIZE_DATACLASS: int
-OPT_SERIALIZE_NUMPY: int
-OPT_SERIALIZE_UUID: int
-OPT_SORT_KEYS: int
-OPT_STRICT_INTEGER: int
-OPT_UTC_Z: int
diff --git a/version.py b/version.py
index 0e53e51cb3..1cf5a7fb56 100644
--- a/version.py
+++ b/version.py
@@ -43,4 +43,4 @@ API_FEATURE_LEVEL = 35
 #   historical commits sharing the same major version, in which case a
 #   minor version bump suffices.
 
-PROVISION_VERSION = '114.4'
+PROVISION_VERSION = '115.0'
diff --git a/zerver/lib/test_runner.py b/zerver/lib/test_runner.py
index cf1d26bf90..91828b6320 100644
--- a/zerver/lib/test_runner.py
+++ b/zerver/lib/test_runner.py
@@ -3,7 +3,6 @@ import os
 import random
 import shutil
 from functools import partial
-from multiprocessing.sharedctypes import Synchronized
 from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Type, Union, cast
 from unittest import TestLoader, TestSuite, runner
 from unittest.result import TestResult
@@ -178,7 +177,7 @@ def create_test_databases(worker_id: int) -> None:
         connection.settings_dict.update(settings_dict)
         connection.close()
 
-def init_worker(counter: Synchronized) -> None:
+def init_worker(counter: "multiprocessing.sharedctypes._Value") -> None:
     """
     This function runs only under parallel mode. It initializes the
     individual processes which are also called workers.