diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5f222e0b..6c3200e0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -42,7 +42,17 @@ jobs:
         run: poetry run flake8
 
       - name: Lint with mypy
-        run: poetry run mypy .
+        uses: tsuyoshicho/action-mypy@v3
+        with:
+          github_token: ${{ secrets.github_token }}
+          # Change reviewdog reporter if you need [github-pr-check,github-check,github-pr-review].
+          reporter: github-pr-review
+          # Change reporter level if you need.
+          # GitHub Status Check won't become failure with warning.
+          # level: warning
+          # Change the current directory to run mypy command.
+          # mypy command reads setup.cfg or other settings file in this path.
+          # workdir: .
 
       - name: Print python versions
         run: |
diff --git a/libvcs/_internal/run.py b/libvcs/_internal/run.py
index be0248d7..b83280ba 100644
--- a/libvcs/_internal/run.py
+++ b/libvcs/_internal/run.py
@@ -178,7 +178,7 @@ def run(
     shell: bool = False,
     cwd: Optional[StrOrBytesPath] = None,
     env: Optional[_ENV] = None,
-    universal_newlines: bool = False,
+    universal_newlines: Optional[bool] = None,
     startupinfo: Optional[Any] = None,
     creationflags: int = 0,
     restore_signals: bool = True,
@@ -262,7 +262,7 @@ def progress_cb(output, timestamp):
         umask=umask,
     )
 
-    all_output: list[str] = []
+    all_output = []
     code = None
     line = None
     while code is None:
@@ -270,7 +270,7 @@ def progress_cb(output, timestamp):
 
         # output = console_to_str(proc.stdout.readline())
         # all_output.append(output)
-        if callback and callable(callback) and proc.stderr is not None:
+        if callback and callable(callback):
             line = console_to_str(proc.stderr.read(128))
             if line:
                 callback(output=line, timestamp=datetime.datetime.now())