diff --git a/fastapi_code_generator/__main__.py b/fastapi_code_generator/__main__.py
index a551e87..630f7dd 100644
--- a/fastapi_code_generator/__main__.py
+++ b/fastapi_code_generator/__main__.py
@@ -43,7 +43,8 @@ def dynamic_load_module(module_path: Path) -> Any:
 
 @app.command()
 def main(
-    input_file: typer.FileText = typer.Option(..., "--input", "-i"),
+    encoding: str = typer.Option("utf-8", "--encoding", "-e"),
+    input_file: str = typer.Option(..., "--input", "-i"),
     output_dir: Path = typer.Option(..., "--output", "-o"),
     model_file: str = typer.Option(None, "--model-file", "-m"),
     template_dir: Optional[Path] = typer.Option(None, "--template-dir", "-t"),
@@ -57,8 +58,12 @@ def main(
     ),
     disable_timestamp: bool = typer.Option(False, "--disable-timestamp"),
 ) -> None:
-    input_name: str = input_file.name
-    input_text: str = input_file.read()
+    input_name: str = input_file
+    input_text: str
+
+    with open(input_file, encoding=encoding) as f:
+        input_text = f.read()
+
     if model_file:
         model_path = Path(model_file).with_suffix('.py')
     else:
@@ -68,6 +73,7 @@ def main(
         return generate_code(
             input_name,
             input_text,
+            encoding,
             output_dir,
             template_dir,
             model_path,
@@ -80,6 +86,7 @@ def main(
     return generate_code(
         input_name,
         input_text,
+        encoding,
         output_dir,
         template_dir,
         model_path,
@@ -103,6 +110,7 @@ def _get_most_of_reference(data_type: DataType) -> Optional[Reference]:
 def generate_code(
     input_name: str,
     input_text: str,
+    encoding: str,
     output_dir: Path,
     template_dir: Optional[Path],
     model_path: Optional[Path] = None,
@@ -218,7 +226,9 @@ def generate_code(
         header += f"\n#   timestamp: {timestamp}"
 
     for path, code in results.items():
-        with output_dir.joinpath(path.with_suffix(".py")).open("wt") as file:
+        with output_dir.joinpath(path.with_suffix(".py")).open(
+            "wt", encoding=encoding
+        ) as file:
             print(header, file=file)
             print("", file=file)
             print(code.rstrip(), file=file)
diff --git a/tests/test_generate.py b/tests/test_generate.py
index b6278e3..32ce824 100644
--- a/tests/test_generate.py
+++ b/tests/test_generate.py
@@ -22,6 +22,8 @@
 
 SPECIFIC_TAGS = 'Wild Boars, Fat Cats'
 
+ENCODING = 'utf-8'
+
 
 @pytest.mark.parametrize(
     "oas_file", (DATA_DIR / OPEN_API_DEFAULT_TEMPLATE_DIR_NAME).glob("*.yaml")
@@ -33,6 +35,7 @@ def test_generate_default_template(oas_file):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=None,
         )
@@ -54,6 +57,7 @@ def test_generate_custom_security_template(oas_file):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=DATA_DIR / 'custom_template' / 'security',
         )
@@ -79,6 +83,7 @@ def test_generate_remote_ref(mocker):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=None,
         )
@@ -105,6 +110,7 @@ def test_disable_timestamp(oas_file):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=None,
             disable_timestamp=True,
@@ -130,6 +136,7 @@ def test_generate_using_routers(oas_file):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=BUILTIN_MODULAR_TEMPLATE_DIR,
             generate_routers=True,
@@ -166,6 +173,7 @@ def test_generate_modify_specific_routers(oas_file):
         generate_code(
             input_name=oas_file.name,
             input_text=oas_file.read_text(),
+            encoding=ENCODING,
             output_dir=output_dir,
             template_dir=BUILTIN_MODULAR_TEMPLATE_DIR,
             generate_routers=True,