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Pants

I’m getting the following error building a python pex binary which worked yesterday
```Exception message: Could not satisfy all requirements for python-dateutil==2.5.3:
    python-dateutil==2.5.3, python-dateutil&gt;=2.1,&lt;3.0.0(from: boto3==1.4.0-&gt;botocore&gt;=1.4.1,&lt;1.5.0)```
python-dateutil pushed `2.6.0` today. I’m able to pip install the requirements without pants no problem. The pants build works if I try building with python-dateutil==2.6.0. Is it possible I’m running into a pants bug?