diff --git a/pyndl/__init__.py b/pyndl/__init__.py
index 47d540b..f216b39 100644
--- a/pyndl/__init__.py
+++ b/pyndl/__init__.py
@@ -17,7 +17,7 @@
 __author__ = ('Konstantin Sering, Marc Weitz, '
               'David-Elias Künstle, Lennard Schneider')
 __author_email__ = 'konstantin.sering@uni-tuebingen.de'
-__version__ = '0.6.4'
+__version__ = '0.7.0'
 __license__ = 'MIT'
 __description__ = ('Naive discriminative learning implements learning and '
                    'classification models based on the Rescorla-Wagner '
diff --git a/tests/conftest.py b/tests/conftest.py
index a5fad37..b96e7ca 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,6 +9,7 @@ def pytest_addoption(parser):
     parser.addoption("--runslow", action="store_true",
                      help="run slow tests")
 
+
 def pytest_runtest_setup(item):
     if 'runslow' in item.keywords and not item.config.getoption("--runslow"):
         pytest.skip("need --runslow option to run this test")
diff --git a/tox.ini b/tox.ini
index 54566e3..a1321db 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = py{35,36}-test, checkstyle, documentation
 
 [testenv]
 usedevelop = True
-whitelist_externals=/bin/rm
+whitelist_externals=rm
 deps =
      test: pytest
      -rrequirements.txt
@@ -13,7 +13,7 @@ commands =
 
 [testenv:testdoc]
 usedevelop = True
-whitelist_externals=/bin/rm
+whitelist_externals=rm
 deps =
     pytest
 commands =