diff --git a/requirements.txt b/requirements.txt
index ab625452e..ba0c9bb9a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,5 +12,3 @@ seaborn
 scikit_learn
 networkx==1.11
 Ipython
-pymc
-pyevtk
\ No newline at end of file
diff --git a/test/test_tutorials/test_ch2.py b/test/test_tutorials/test_ch2.py
index 8a5fd5a83..10f8c6d5b 100644
--- a/test/test_tutorials/test_ch2.py
+++ b/test/test_tutorials/test_ch2.py
@@ -24,7 +24,7 @@
 
 # Aux imports
 import numpy as np
-
+import pytest
 
 def test_ch2(theano_f):
     # Importing the data from csv files and settign extent and resolution
@@ -78,7 +78,7 @@ def test_ch2(theano_f):
 
 
     vertices, simplices = gp.get_surfaces(interp_data, lith_block[1], None, original_scale=False)
-
+    pyevtk = pytest.importorskip("pyevtk")
     gp.export_to_vtk(geo_data, path=os.path.dirname(__file__)+'/vtk_files', lith_block=lith_block[0], vertices=vertices, simplices=simplices)
 
     # gp.plot_surfaces_3D_real_time(interp_data, vertices, simplices, alpha=1)
diff --git a/test/test_tutorials/test_ch3.py b/test/test_tutorials/test_ch3.py
index 22573c582..4d11988a4 100644
--- a/test/test_tutorials/test_ch3.py
+++ b/test/test_tutorials/test_ch3.py
@@ -28,9 +28,11 @@
 
 #from ..conftest import theano_f
 input_path = os.path.dirname(__file__)+'/../../notebooks'
-
+import pytest
+pymc = pytest.importorskip("pymc")
 
 def test_ch3_a(theano_f):
+
     # set cube size and model extent
     cs = 50
     extent = (3000, 200, 2000)  # (x, y, z)