diff --git a/pkgs/development/python-modules/tomli/default.nix b/pkgs/development/python-modules/tomli/default.nix
index 19a0fe6135e5..c593e1e4cb19 100644
--- a/pkgs/development/python-modules/tomli/default.nix
+++ b/pkgs/development/python-modules/tomli/default.nix
@@ -7,7 +7,7 @@
 
 buildPythonPackage rec {
   pname = "tomli";
-  version = "1.2.1";
+  version = "1.2.2";
   format = "pyproject";
 
   outputs = [
@@ -19,9 +19,14 @@ buildPythonPackage rec {
     owner = "hukkin";
     repo = pname;
     rev = version;
-    sha256 = "sha256-30AQ9MQmclcjl1d83mIoxFXzaJn1OFKQlVxayqC5NxY=";
+    sha256 = "sha256-oDjpNzWxTaCC1+WyBKrkR6kp90ZomcZQfyW+xKddDoM=";
   };
 
+  patches = [
+    # required for mypy
+    ./fix-backwards-compatibility-load.patch
+  ];
+
   nativeBuildInputs = [ flit-core ];
 
   postInstall = ''
diff --git a/pkgs/development/python-modules/tomli/fix-backwards-compatibility-load.patch b/pkgs/development/python-modules/tomli/fix-backwards-compatibility-load.patch
new file mode 100644
index 000000000000..edfc2f383495
--- /dev/null
+++ b/pkgs/development/python-modules/tomli/fix-backwards-compatibility-load.patch
@@ -0,0 +1,21 @@
+diff --git a/tomli/_parser.py b/tomli/_parser.py
+index 89e81c3..6fb1bfd 100644
+--- a/tomli/_parser.py
++++ b/tomli/_parser.py
+@@ -1,6 +1,6 @@
+ import string
+ from types import MappingProxyType
+-from typing import Any, BinaryIO, Dict, FrozenSet, Iterable, NamedTuple, Optional, Tuple
++from typing import IO, Union, Any, BinaryIO, Dict, FrozenSet, Iterable, NamedTuple, Optional, Tuple
+ import warnings
+ 
+ from tomli._re import (
+@@ -48,7 +48,7 @@ class TOMLDecodeError(ValueError):
+     """An error raised if a document is not valid TOML."""
+ 
+ 
+-def load(fp: BinaryIO, *, parse_float: ParseFloat = float) -> Dict[str, Any]:
++def load(fp: Union[IO, BinaryIO], *, parse_float: ParseFloat = float) -> Dict[str, Any]:
+     """Parse TOML from a binary file object."""
+     s_bytes = fp.read()
+     try: