diff --git a/custom_json_diff/lib/custom_diff.py b/custom_json_diff/lib/custom_diff.py
index 4db197a..40869b6 100644
--- a/custom_json_diff/lib/custom_diff.py
+++ b/custom_json_diff/lib/custom_diff.py
@@ -108,7 +108,7 @@ def generate_bom_diff(bom: BomDicts, commons: BomDicts, common_refs: Dict) -> Di
                 case _:
                     diff_summary["components"]["other_components"].append(i.to_dict())  #type: ignore
     diff_summary["misc_data"] = (bom.misc_data - commons.misc_data).to_dict()
-    diff_summary["components"] = filter_empty(bom.options.include_empty, diff_summary["components"])
+    diff_summary["components"] = filter_empty(bom.options.include_empty, diff_summary["components"])  #type: ignore
     return filter_empty(commons.options.include_empty, diff_summary)
 
 
diff --git a/custom_json_diff/lib/custom_diff_classes.py b/custom_json_diff/lib/custom_diff_classes.py
index 6dabf50..a18d8ad 100644
--- a/custom_json_diff/lib/custom_diff_classes.py
+++ b/custom_json_diff/lib/custom_diff_classes.py
@@ -2,7 +2,7 @@
 import re
 from copy import deepcopy
 from dataclasses import dataclass, field
-from typing import Dict, List, Set, Tuple
+from typing import Dict, List, Optional, Set, Tuple
 
 from json_flatten import unflatten  # type: ignore
 
@@ -230,9 +230,9 @@ def __init__(self, dep: Dict, options: "Options"):
         self.ref = dep.get("ref", "")
         self._deps = Array(dep.get("dependsOn", []))
         # deprecated
-        self.original_data = {}
+        self.original_data: Dict = {}
         self.ref_no_version, self._deps_no_version = import_bom_dependency(
-            dep, options.allow_new_versions) if options.allow_new_versions else "", []
+            dep, options.allow_new_versions) if options.allow_new_versions else "", Array([])
         self.options = options
 
     def __eq__(self, other):
@@ -465,7 +465,7 @@ def to_dict(self):
 
 class BomVdr:
     """Class for holding bom vulnerability data"""
-    def __init__(self, data: Dict = None, options: "Options" = Options(), **kwargs):
+    def __init__(self, data: Optional[Dict] = None, options: "Options" = Options(), **kwargs):
         if not data:
             data = {}
         self.options = options
diff --git a/custom_json_diff/lib/utils.py b/custom_json_diff/lib/utils.py
index 98f132c..a147ff8 100644
--- a/custom_json_diff/lib/utils.py
+++ b/custom_json_diff/lib/utils.py
@@ -4,7 +4,7 @@
 import re
 import sys
 from datetime import date, datetime
-from typing import Any, Dict, List, LiteralString, TYPE_CHECKING
+from typing import Any, Dict, List, TYPE_CHECKING
 
 import packageurl
 import semver
@@ -106,7 +106,7 @@ def export_html_report(outfile: str, diffs: Dict, options: "Options", status: in
         template_file = options.report_template or os.path.join(os.path.dirname(os.path.realpath(__file__)), f"{options.preconfig_type}_diff_template.j2")
     template = file_read(template_file)
     jinja_env = Environment(autoescape=True)
-    jinja_tmpl = jinja_env.from_string(template)
+    jinja_tmpl = jinja_env.from_string(str(template))
     if options.preconfig_type == "bom":
         report_result = render_bom_template(diffs, jinja_tmpl, options, stats_summary, status)
     else:
@@ -115,7 +115,7 @@ def export_html_report(outfile: str, diffs: Dict, options: "Options", status: in
                success_msg=f"HTML report generated: {outfile}")
 
 
-def file_read(filename: LiteralString | str | bytes, binary: bool = False, error_msg: str = "", log: logging.Logger = logger) -> str | bytes:
+def file_read(filename: str | bytes, binary: bool = False, error_msg: str = "", log: logging.Logger = logger) -> str | bytes:
     try:
         if binary:
             with open(filename, "rb") as f:
@@ -130,7 +130,7 @@ def file_read(filename: LiteralString | str | bytes, binary: bool = False, error
     return ""
 
 
-def file_write(filename: LiteralString | str | bytes, contents, error_msg: str = "", success_msg: str = "", log: logging.Logger = logger) -> None:
+def file_write(filename: str | bytes, contents, error_msg: str = "", success_msg: str = "", log: logging.Logger = logger) -> None:
     try:
         with open(filename, "w", encoding="utf-8") as f:
             f.write(contents)
@@ -170,7 +170,7 @@ def get_sort_key_list(data: List[Dict], sort_keys: List):
 def import_config(config: str) -> Dict:
     file_data = file_read(config, False, f"Unable to locate {config}.")
     try:
-        toml_data = toml.loads(file_data)
+        toml_data = toml.loads(str(file_data))
         if toml_data.get("preset_settings") and toml_data["preset_settings"].get("type", "") not in {
             "bom", "csaf"}:
             raise ValueError("Invalid preset type.")