diff --git a/docs/source/conf.py b/docs/source/conf.py
index 487ce71..d3cd1c8 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -16,7 +16,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "MailThunder"
-copyright = "2020 ~ Now, JE-Chen"
+project_copyright = "2020 ~ Now, JE-Chen"
 author = "JE-Chen"
 
 # -- General configuration ---------------------------------------------------
diff --git a/je_mail_thunder/utils/package_manager/package_manager_class.py b/je_mail_thunder/utils/package_manager/package_manager_class.py
index 078c2bd..f06e5a6 100644
--- a/je_mail_thunder/utils/package_manager/package_manager_class.py
+++ b/je_mail_thunder/utils/package_manager/package_manager_class.py
@@ -5,6 +5,12 @@
 from je_mail_thunder.utils.logging.loggin_instance import mail_thunder_logger
 
 
+def _is_safe_module_name(package: str) -> bool:
+    if not isinstance(package, str) or not package:
+        return False
+    return all(part.isidentifier() for part in package.split("."))
+
+
 class PackageManager:
 
     def __init__(self):
@@ -17,9 +23,13 @@ def check_package(self, package: str):
         :param package: package to check exists or not
         :return: package if find else None
         """
+        if not _is_safe_module_name(package):
+            mail_thunder_logger.error(
+                f"check_package: rejected non-conforming module name: {package!r}")
+            return None
         if self.installed_package_dict.get(package, None) is None:
             found_spec = find_spec(package)
-            if found_spec is not None:
+            if found_spec is not None and _is_safe_module_name(found_spec.name):
                 try:
                     installed_package = import_module(found_spec.name)
                     self.installed_package_dict.update(
diff --git a/test/unit_test/test_executor.py b/test/unit_test/test_executor.py
index e50d530..2680a4c 100644
--- a/test/unit_test/test_executor.py
+++ b/test/unit_test/test_executor.py
@@ -1,6 +1,3 @@
-import os
-import types
-
 import pytest
 
 from je_mail_thunder.utils.exception.exceptions import AddCommandException, ExecuteActionException
diff --git a/test/unit_test/test_get_dir_file_list.py b/test/unit_test/test_get_dir_file_list.py
index 1fd1305..4fbc906 100644
--- a/test/unit_test/test_get_dir_file_list.py
+++ b/test/unit_test/test_get_dir_file_list.py
@@ -1,5 +1,4 @@
 import os
-import shutil
 import tempfile
 
 from je_mail_thunder.utils.file_process.get_dir_file_list import get_dir_files_as_list
diff --git a/test/unit_test/test_json_file.py b/test/unit_test/test_json_file.py
index d920b8b..76d06b1 100644
--- a/test/unit_test/test_json_file.py
+++ b/test/unit_test/test_json_file.py
@@ -1,9 +1,6 @@
 import json
 import os
 
-import pytest
-
-from je_mail_thunder.utils.exception.exceptions import JsonActionException
 from je_mail_thunder.utils.json.json_file import read_action_json, write_action_json
 
 TEST_JSON_PATH = "test_action.json"