diff --git a/lib/rouge/lexers/python.rb b/lib/rouge/lexers/python.rb
index 71fc7bc564..2eace86a60 100644
--- a/lib/rouge/lexers/python.rb
+++ b/lib/rouge/lexers/python.rb
@@ -13,7 +13,7 @@ class Python < RegexLexer
       mimetypes 'text/x-python', 'application/x-python'
 
       def self.detect?(text)
-        return true if text.shebang?(/pythonw?(?:[23](?:\.\d+)?)?/)
+        return true if text.shebang?(/pythonw?(?:[3](?:\.\d+)?)?/)
       end
 
       def self.keywords