diff --git a/parso/python/tokenize.py b/parso/python/tokenize.py
index 9d8b6b8..6a73b2d 100644
--- a/parso/python/tokenize.py
+++ b/parso/python/tokenize.py
@@ -406,9 +406,10 @@ if __name__ == "__main__":
     else:
         code = sys.stdin.read()
 
+    from parso.utils import source_to_unicode, parse_version_string
+
     if isinstance(code, bytes):
-        from parso.utils import source_to_unicode
         code = source_to_unicode(code)
 
-    for token in tokenize(code):
+    for token in tokenize(code, parse_version_string()):
         print(token)