diff --git a/tox.ini b/tox.ini
index 04ff33f50..ba74e8686 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ envlist = py27, py34, py35, flake8
 
 [travis]
 python =
+    3.6: py36
     3.5: py35
     3.4: py34
     3.3: py33
diff --git a/wwdata/Class_HydroData.pyc b/wwdata/Class_HydroData.pyc
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diff --git a/wwdata/Class_LabExperimBased.pyc b/wwdata/Class_LabExperimBased.pyc
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diff --git a/wwdata/Class_LabSensorBased.pyc b/wwdata/Class_LabSensorBased.pyc
index f5ef3b2df..c16ceaafb 100644
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diff --git a/wwdata/Class_OnlineSensorBased.pyc b/wwdata/Class_OnlineSensorBased.pyc
index a71cc9041..adeddc15e 100644
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diff --git a/wwdata/__init__.pyc b/wwdata/__init__.pyc
index 5f90acd79..53d7f6ed9 100644
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diff --git a/wwdata/data_reading_functions.pyc b/wwdata/data_reading_functions.pyc
index d84b4ae53..3264c71e6 100644
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diff --git a/wwdata/time_conversion_functions.pyc b/wwdata/time_conversion_functions.pyc
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