diff --git a/dama/core/gridarray.py b/dama/core/gridarray.py
index 84649a9..a6184c6 100644
--- a/dama/core/gridarray.py
+++ b/dama/core/gridarray.py
@@ -176,7 +176,7 @@ def __getitem__(self, item, *args):
                 raise IndexError('No variable %s in DataSet' % item)
 
         if isinstance(item, dm.GridArray):
-            if item.dtype == np.bool:
+            if item.dtype == bool:
                 mask = np.logical_and(~self.mask, ~np.asarray(item))
                 new_item = dm.GridArray(np.asarray(self), grid=self.grid)
                 new_item.mask = mask
@@ -235,7 +235,7 @@ def array_shape(self):
 
     def __setitem__(self, item, val):
         if isinstance(item, dm.GridArray):
-            if item.dtype == np.bool:
+            if item.dtype == bool:
                 mask = np.logical_and(~self.mask, ~np.asarray(item))
                 if np.isscalar(val):
                     self[item].data[mask] = val
diff --git a/dama/core/griddata.py b/dama/core/griddata.py
index 8a4e19b..208c39d 100644
--- a/dama/core/griddata.py
+++ b/dama/core/griddata.py
@@ -87,7 +87,7 @@ def __getitem__(self, item):
 
         # mask
         if isinstance(item, dm.GridArray):
-            if item.dtype == np.bool:
+            if item.dtype == bool:
                 # in this case it is a mask
                 # ToDo: masked operations behave strangely, operations are applyed to all elements, even if masked
                 new_data = dm.GridData(self._grid)
diff --git a/dama/plotting/stat_plot.py b/dama/plotting/stat_plot.py
old mode 100644
new mode 100755
diff --git a/setup.py b/setup.py
index f2e8dc5..9d96a06 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 setup(
     name='dama',
-    version='0.4.6',
+    version='0.4.8',
     packages=find_packages(),
     license='Apache 2.0',
     author='Philipp Eller',