diff --git a/mypy_silent/cli.py b/mypy_silent/cli.py
index 65f7cf4..06ba3c8 100644
--- a/mypy_silent/cli.py
+++ b/mypy_silent/cli.py
@@ -29,7 +29,9 @@ def mypy_silent(
         if info.message in UNUSED_IGNORE_MESSAGES:
             new_content = remove_type_ignore_comment(old_content)
         else:
-            new_content = add_type_ignore_comment(old_content, error_code=info.error_code)
+            new_content = add_type_ignore_comment(
+                old_content, error_code=info.error_code
+            )
         file_contents[info.position.line - 1] = new_content
         with open(info.position.filename, "w") as f:
             f.writelines(file_contents)
diff --git a/mypy_silent/maho.py b/mypy_silent/maho.py
index 2be7229..145b93a 100644
--- a/mypy_silent/maho.py
+++ b/mypy_silent/maho.py
@@ -12,7 +12,11 @@ def add_type_ignore_comment(line: str, error_code: Optional[str]) -> str:
     if "# noqa" in line:
         return line.replace("# noqa", f"{type_ignore_comment} # noqa", 1)
     content_without_crlf = line.rstrip("\r\n")
-    return content_without_crlf + f"  {type_ignore_comment}" + line[len(content_without_crlf) :]
+    return (
+        content_without_crlf
+        + f"  {type_ignore_comment}"
+        + line[len(content_without_crlf) :]
+    )
 
 
 def remove_type_ignore_comment(line: str) -> str:
diff --git a/mypy_silent/parser.py b/mypy_silent/parser.py
index 695f827..ce203a8 100644
--- a/mypy_silent/parser.py
+++ b/mypy_silent/parser.py
@@ -6,7 +6,9 @@
 
 from typing_extensions import Final
 
-UNUSED_IGNORE_MESSAGES: Final[FrozenSet[str]] = frozenset({"error: unused 'type: ignore' comment", 'error: unused "type: ignore" comment'})
+UNUSED_IGNORE_MESSAGES: Final[FrozenSet[str]] = frozenset(
+    {"error: unused 'type: ignore' comment", 'error: unused "type: ignore" comment'}
+)
 
 
 class FilePosition(NamedTuple):
@@ -20,7 +22,9 @@ class MypyMessage(NamedTuple):
     error_code: Optional[str]
 
 
-_mypy_output_re = re.compile(r"^(?P<filename>[^:]+):(?P<line>\d+):(?P<message>.+?)(\[(?P<error_code>[a-z-]+)\])?$")
+_mypy_output_re = re.compile(
+    r"^(?P<filename>[^:]+):(?P<line>\d+):(?P<message>.+?)(\[(?P<error_code>[a-z-]+)\])?$"
+)
 
 
 def get_info_from_mypy_output(lines: Iterable[str]) -> Iterable[MypyMessage]:
diff --git a/pyproject.toml b/pyproject.toml
index 3647de0..e193bfd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ typing-extensions = "^3.7.4;python<3.8"
 
 [tool.poetry.dev-dependencies]
 mypy = "^0.812"
-pytest = "^6.2.4"
+pytest = "^7.1.1"
 pytest-cov = "^2.12.1"
 
 [build-system]