diff --git a/requirements.txt b/requirements.txt
index ed38fe2..5a95e37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 svgwrite
 cairosvg
 lxml
-pillow
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+pillow==9.5.0
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diff --git a/test/main.py b/test/main.py
index 240bd5f..125c518 100644
--- a/test/main.py
+++ b/test/main.py
@@ -50,7 +50,7 @@ content_width = min_width
 content_height = min_height + exit_height + 2 * safe_area_size
 
 parser = argparse.ArgumentParser()
-parser.add_argument('-d', '--data', dest='Data', type=str, default='./example/demo.json', help='Path of json data file.')
+parser.add_argument('-d', '--data', dest='Data', type=str, default='./example/example.json', help='Path of json data file.')
 args = parser.parse_args()
 data_file_path = args.Data
 
@@ -186,7 +186,7 @@ with open(svg_file_path, 'wb') as f:
 
 # save as png
 cairosvg.svg2png(url=svg_file_path, write_to=png_file_path)
-os.remove(svg_file_path)
+# os.remove(svg_file_path)
 
 # additional element
 # open the image
diff --git a/utils/font_size.py b/utils/font_size.py
index 0d03441..5c108dc 100644
--- a/utils/font_size.py
+++ b/utils/font_size.py
@@ -3,13 +3,3 @@ from PIL import ImageFont
 class FontSize:
     def get_font_width(text, font, size):
         return sum([ImageFont.truetype(font, int(size), 0).getsize(char)[0] for char in text])
-    
-    def font_size_width_dict(font, size):
-        dict = {}
-        for char in range(ord('0'), ord('9') + 1):
-            dict[chr(char)] = ImageFont.truetype(font, size, 0).getsize(chr(char))[0] / size
-        for char in range(ord('A'), ord('Z') + 1):
-            dict[chr(char)] = ImageFont.truetype(font, size, 0).getsize(chr(char))[0] / size
-        for char in range(ord('a'), ord('z') + 1):
-            dict[chr(char)] = ImageFont.truetype(font, size, 0).getsize(chr(char))[0] / size
-        return dict
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