diff --git a/README.md b/README.md
index 3968461..ed1aa94 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ print_html('お茶にお煎餅、よく合いますね')
 
 ## Usage
 ```
-$ python3 furigana.py '活版印刷の流れを汲む出版作業では'
+$ python3 furigana/furigana.py '活版印刷の流れを汲む出版作業では'
 ```
 
 # Dependency
diff --git a/furigana/__main__.py b/furigana/__main__.py
index c17ce1f..7928c31 100644
--- a/furigana/__main__.py
+++ b/furigana/__main__.py
@@ -11,8 +11,7 @@ def return_html(text):
     for pair in split_furigana(text):
         if len(pair)==2:
             kanji,hira = pair
-            output += "<ruby><rb>{0}</rb><rt>{1}</rt></ruby>".
-                    format(kanji, hira)
+            output += f"<ruby><rb>{0}</rb><rt>{1}</rt></ruby>".format(kanji, hira)
         else:
             output += pair[0]
     return output
diff --git a/setup.cfg b/setup.cfg
index 0c5413c..ad3d2eb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,5 +7,5 @@ setup_requires =
     pip >= 19.1
 
 install_requires =
-    mecab-python3 == 1.0.3
+    mecab-python3 >= 1.0.5
     jaconv == 0.3
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