Pinning a particular version of JuMP

I am trying to pin JuMP v-0.9.0 to run a particular code. However, it is giving me following errors:

Julia is fixed at 0.6.1 conflicting with requirement for JuMP
JuMP is fixed at 0.9.0 conflicting with top-level requirement.

I have latest version of Julia and JuMP installed. Please let me know if there is a way to install specific version of Julia and JuMP.

JuMP v0.9.0 is ancient and appears to have been written when Julia was at version 0.4, so it’s not surprising that it’s incompatible with Julia 0.6. You can download older Julia releases from

Thank you!