Crashing

So when 1.10 came out I was super hyped. Now its 1.11, and I am still stuck in the version 1.9.4. Everytime I try and join a Minecraft server, say Omega Realms. I crash, and it says a error has happened. I don't understand? I cant update my game and I am afraid that Omega realms will update their server to 1.10 and up. May I have some needed help?