-How do I upgrade my existing LyX system to version 2.0.x?
+How do I upgrade my existing LyX system to version 2.1.x?
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+* Upgrading from LyX 2.0.x:
+
+Python version >=2.4 is now required.
+
+Python version >3.0 is still not yet supported.
+
* Upgrading from LyX 1.6.x:
The format of preference and session files has changed. LyX 2.0.x is
definitions, you can add an extra "\usepackage{babel}" statement at
the beginning of your preamble.
-http://bugzilla.lyx.org/show_bug.cgi?id=315
+http://www.lyx.org/trac/ticket/315