diff --git a/docs/subsystems/dependencies.md b/docs/subsystems/dependencies.md
index 672d44f683..8e9da08e7a 100644
--- a/docs/subsystems/dependencies.md
+++ b/docs/subsystems/dependencies.md
@@ -192,7 +192,7 @@ highlighting.  The system is largely managed by the code in
 * **Mypy type checker**.  Because we're using mypy in a strict mode,
   when you add use of a new Python dependency, you usually need to
   either adds stubs to the `stubs/` directory for the library, or edit
-  `mypy.ini` in the root of the Zulip project to configure
+  `pyproject.toml` in the root of the Zulip project to configure
   `ignore_missing_imports` for the new library.  See
   [our mypy docs][mypy-docs] for more details.
 
diff --git a/docs/testing/mypy.md b/docs/testing/mypy.md
index b056374f53..cf71e26e5f 100644
--- a/docs/testing/mypy.md
+++ b/docs/testing/mypy.md
@@ -98,14 +98,14 @@ basically the equivalent of C header files defining the types used in
 these Python APIs.
 
 For other third-party modules that we call from Zulip, one either
-needs to add an `ignore_missing_imports` entry in `mypy.ini` in the
+needs to add an `ignore_missing_imports` entry in `pyproject.toml` in the
 root of the project, letting `mypy` know that it's third-party code,
 or add type stubs to the `stubs/` directory, which has type stubs that
 mypy can use to type-check calls into that third-party module.
 
 It's easy to add new stubs!  Just read the docs, look at some of
 existing examples to see how they work, and remember to remove the
-`ignore_missing_imports` entry in `mypy.ini` when you add them.
+`ignore_missing_imports` entry in `pyproject.toml` when you add them.
 
 For any third-party modules that don't have stubs, `mypy` treats
 everything in the third-party module as an `Any`, which is the right
diff --git a/mypy.ini b/mypy.ini
deleted file mode 100644
index 35e9144b14..0000000000
--- a/mypy.ini
+++ /dev/null
@@ -1,40 +0,0 @@
-[mypy]
-# Logistics of what code to check and how to handle the data.
-scripts_are_modules = True
-show_traceback = True
-# See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-stubs-for-third-party-modules
-# for notes on how we manage mypy stubs.
-mypy_path = $MYPY_CONFIG_FILE_DIR/stubs
-cache_dir = $MYPY_CONFIG_FILE_DIR/var/mypy-cache
-
-# These are all the options that would be enabled by mypy --strict, in
-# the order listed by the mypy --help documentation of --strict.  We
-# do not yet enable all of them.
-warn_unused_configs = True
-disallow_any_generics = True
-disallow_subclassing_any = False
-disallow_untyped_calls = False
-disallow_untyped_defs = True
-disallow_incomplete_defs = True
-check_untyped_defs = True
-disallow_untyped_decorators = False
-no_implicit_optional = True
-warn_redundant_casts = True
-warn_unused_ignores = True
-warn_return_any = False
-no_implicit_reexport = False
-strict_equality = True
-
-# Display the codes needed for # type: ignore[code] annotations.
-show_error_codes = True
-
-# We use a lot of third-party libraries we don't have stubs for, as
-# well as a handful of our own modules that we haven't told mypy how
-# to find.  Ignore them.  (For some details, see:
-# `git log -p -S ignore_missing_imports mypy.ini`.)
-#
-# This doesn't get in the way of using the stubs we *do* have.
-ignore_missing_imports = True
-
-# Warn of unreachable or redundant code.
-warn_unreachable = True
diff --git a/pyproject.toml b/pyproject.toml
index cfea661f79..bcc7729afb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,3 +7,44 @@ src_paths = [".", "tools", "tools/setup/emoji"]
 known_third_party = "zulip"
 profile = "black"
 line_length = 100
+
+[tool.mypy]
+# Logistics of what code to check and how to handle the data.
+scripts_are_modules = true
+show_traceback = true
+# See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-stubs-for-third-party-modules
+# for notes on how we manage mypy stubs.
+mypy_path = "$MYPY_CONFIG_FILE_DIR/stubs"
+cache_dir = "$MYPY_CONFIG_FILE_DIR/var/mypy-cache"
+
+# These are all the options that would be enabled by mypy --strict, in
+# the order listed by the mypy --help documentation of --strict.  We
+# do not yet enable all of them.
+warn_unused_configs = true
+disallow_any_generics = true
+disallow_subclassing_any = false
+disallow_untyped_calls = false
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_untyped_decorators = false
+no_implicit_optional = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_return_any = false
+no_implicit_reexport = false
+strict_equality = true
+
+# Display the codes needed for # type: ignore[code] annotations.
+show_error_codes = true
+
+# We use a lot of third-party libraries we don't have stubs for, as
+# well as a handful of our own modules that we haven't told mypy how
+# to find.  Ignore them.  (For some details, see:
+# `git log -p -S ignore_missing_imports -- mypy.ini`.)
+#
+# This doesn't get in the way of using the stubs we *do* have.
+ignore_missing_imports = true
+
+# Warn of unreachable or redundant code.
+warn_unreachable = true
diff --git a/tools/lint b/tools/lint
index a67fb51a9b..bc33f568bf 100755
--- a/tools/lint
+++ b/tools/lint
@@ -134,7 +134,7 @@ def run() -> None:
         command,
         ["py"],
         pass_targets=False,
-        description="Static type checker for Python (config: mypy.ini)",
+        description="Static type checker for Python (config: pyproject.toml)",
     )
     linter_config.external_linter(
         "tsc",