diff --git a/README.md b/README.md
index 681acc9..e9e4851 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ We currently provide tasks that manage setting files for the following tools:
 ## What isn't pysen?
 
 * pysen is not a linting tool per se. Rather, `pysen run lint` orchestrates multiple python linting tools by automatically setting up their configurations from a more abstract setting for pysen.
-* pysen does not manage your depedencies and packages. We recommend using package managers such as [pipenv](https://github.com/pypa/pipenv) or [poetry](https://python-poetry.org/) to lock your dependecy versions, **including the versions for the linting tools that pysen coordinates** (i.e., isort, mypy, flake8, black). The supported versions for these tools can be found in the `extra_requires/lint` section in pysen's [setup.py](https://github.com/pfnet/pysen/blob/main/setup.py). You should **not** rely on `pip install pysen[lint]` to control the versions of your linting tools.
+* pysen does not manage your dependencies and packages. We recommend using package managers such as [pipenv](https://github.com/pypa/pipenv) or [poetry](https://python-poetry.org/) to lock your dependency versions, **including the versions for the linting tools that pysen coordinates** (i.e., isort, mypy, flake8, black). The supported versions for these tools can be found in the `extra_requires/lint` section in pysen's [setup.py](https://github.com/pfnet/pysen/blob/main/setup.py). You should **not** rely on `pip install pysen[lint]` to control the versions of your linting tools.
 * pysen is not limited to linting purposes or python. See the [plugin section](README.md#create-a-plugin-to-customize-pysen) for details.
 
 ## How it works: Settings file directory
@@ -255,7 +255,7 @@ $ pipenv sync
 $ pipenv shell
 ```
 
-- Update depedencies in `Pipfile.lock`
+- Update dependencies in `Pipfile.lock`
 ```sh
 $ pipenv lock --pre
 ```
diff --git a/pysen/dumper.py b/pysen/dumper.py
index 3d25271..3f715ac 100644
--- a/pysen/dumper.py
+++ b/pysen/dumper.py
@@ -17,7 +17,7 @@ def dump_toml(path: pathlib.Path, setting: SettingFile) -> None:
         with path.open("r") as f:
             document = tomlkit.loads(f.read())
 
-    # NOTE(igarashi): TOMLDocument inherists Dict
+    # NOTE(igarashi): TOMLDocument inherits Dict
     entry = setting.entries()
     for p, d in sorted(entry):
         updated = SettingFile.update_by_entry(document, p, d)
diff --git a/pysen/ext/isort_wrapper.py b/pysen/ext/isort_wrapper.py
index 0495986..a551d56 100644
--- a/pysen/ext/isort_wrapper.py
+++ b/pysen/ext/isort_wrapper.py
@@ -73,7 +73,7 @@ def to_black_compatible(self) -> "IsortSetting":
         # include_trailing_comma: black appends trailing comma
         # force_grid_wrap: the property means isort grid-wrap the statement regardless
         #                  of line length if the number of `from` imports is greater than
-        #                  the property. black doesn't grid wrap the statemenet if it
+        #                  the property. black doesn't grid wrap the statement if it
         #                  doesn't exceed the line length.
         # use_parentheses: use parenthesis for line continuation instead of `\`
         new = copy.deepcopy(self)
diff --git a/pysen/plugin_loader.py b/pysen/plugin_loader.py
index 254fa9b..c5c0e27 100644
--- a/pysen/plugin_loader.py
+++ b/pysen/plugin_loader.py
@@ -53,7 +53,7 @@ def load_plugin(
         raise TypeError("must specify either function or script")
 
     if function is not None and script is not None:
-        raise TypeError("only one of function or script must be speicifed")
+        raise TypeError("only one of function or script must be specified")
 
     if function is not None:
         try:
diff --git a/pysen/pyproject_model.py b/pysen/pyproject_model.py
index 0772480..236dc1e 100644
--- a/pysen/pyproject_model.py
+++ b/pysen/pyproject_model.py
@@ -98,7 +98,7 @@ def _parse_plugin_configs(base_dir: pathlib.Path, data: Any) -> List[PluginConfi
             )
 
         if config.function is not None and config.script is not None:
-            raise dacite.DaciteError("only one of function or script must be speicifed")
+            raise dacite.DaciteError("only one of function or script must be specified")
 
         result.append(config)
 
diff --git a/pysen/reporter.py b/pysen/reporter.py
index 569a61a..6e6b880 100644
--- a/pysen/reporter.py
+++ b/pysen/reporter.py
@@ -146,7 +146,7 @@ def format_summary(self) -> str:
 
     def format_error_summary(self) -> str:
         with io.StringIO() as buf:
-            buf.write("Errored:\n")
+            buf.write("Error:\n")
             for r in self._reporters:
                 if not r.success:
                     buf.write(" - {}\n".format(r.name))
diff --git a/tests/test_process_utils.py b/tests/test_process_utils.py
index fca17f4..e5d5cf2 100644
--- a/tests/test_process_utils.py
+++ b/tests/test_process_utils.py
@@ -60,7 +60,7 @@ class HandlerException(Exception):
 
 class FailingHandler(logging.Handler):
     def emit(self, record: logging.LogRecord) -> None:
-        raise HandlerException("somebody screwded up")
+        raise HandlerException("somebody screwed up")
 
 
 @pytest.mark.parametrize(
diff --git a/tests/test_source.py b/tests/test_source.py
index fee79f3..56078be 100644
--- a/tests/test_source.py
+++ b/tests/test_source.py
@@ -57,7 +57,7 @@ def test__resolve() -> None:
     assert len(resolved) > 1
     assert all(str(x).startswith(str(BASE_DIR)) and x.suffix == ".py" for x in resolved)
 
-    # NOTE(igarashi): check base_dir of glob is overriden by setting
+    # NOTE(igarashi): check base_dir of glob is overridden by setting
     setting = SourceEntrySetting(glob=True, base_dir=BASE_DIR / "fakes")
     resolved_with_base = _resolve(BASE_DIR, "**/*.py", setting)
     assert len(resolved_with_base) > 1