We have just released Rally 0.9.2. This release contains several bugfixes and some minor improvements (see also the 0.9.2 release page).
How to...?
- ... upgrade: 
pip3 install --upgrade esrally - ... install: 
pip3 install esrally 
Note: Depending on your system setup you probably need to prepend these commands with sudo.
Please follow the quickstart for a first time install.
Questions and Feedback
If you have questions or feedback, please just post in the Rally forum.