diff --git a/.travis.yml b/.travis.yml
index 6f87c275..ed4565db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ python:
   - "2.7"
   - "3.3"
 before_install:
-  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then wget http://repo.continuum.io/miniconda/Miniconda-3.0.0-Linux-x86_64.sh -O miniconda.sh; else wget http://repo.continuum.io/miniconda/Miniconda3-3.0.0-Linux-x86_64.sh -O miniconda.sh; fi
+  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then wget http://repo.continuum.io/miniconda/Miniconda-3.7.0-Linux-x86_64.sh -O miniconda.sh; else wget http://repo.continuum.io/miniconda/Miniconda3-3.7.0-Linux-x86_64.sh -O miniconda.sh; fi
   - chmod +x miniconda.sh
   - ./miniconda.sh -b
   - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then export PATH=/home/travis/miniconda/bin:$PATH; else export PATH=/home/travis/miniconda3/bin:$PATH; fi
diff --git a/zipline/finance/risk/cumulative.py b/zipline/finance/risk/cumulative.py
index 03f0b482..1d92afce 100644
--- a/zipline/finance/risk/cumulative.py
+++ b/zipline/finance/risk/cumulative.py
@@ -163,7 +163,8 @@ class RiskMetricsCumulative(object):
         self.latest_dt = cont_index[0]
 
         self.metrics = pd.DataFrame(index=cont_index,
-                                    columns=self.METRIC_NAMES)
+                                    columns=self.METRIC_NAMES,
+                                    dtype=float)
 
         self.drawdowns = pd.Series(index=cont_index)
         self.max_drawdowns = pd.Series(index=cont_index)