Mono.Cecil was developed by JB Evain back in the fall of 2004 and since has had a fairly stable code base that has changed very little. The world has rather changed around Mono.Cecil... until now! Mono.Cecil has now been updated utilising many compiler features introduced with the .NET framework over the years, fixing many bugs, improving performance, and also improving code flow for developers. Since NCloak is still in development, I thought it would be a perfect chance to stay on top of the game and upgrade to the shiny new v0.9.2 of Mono.Cecil. This is a breaking version upgrade therefore, as expected, drove me a little insane ironing out all of the introduced bugs in the code! This article is essentially a summary of "gotchas" outside of the migration document to help anyone else performing a migration.