diff --git a/conda_env.yml b/conda_env.yml
index 8b15adb5..39c67443 100644
--- a/conda_env.yml
+++ b/conda_env.yml
@@ -3,18 +3,19 @@
 
 name: gprMax
 dependencies:
-- python=3.6.*
+- python=3.6.6
 - colorama
 - cython
 - h5py
 - jupyter
 - matplotlib
+- mkl=2018.0.0
 - numpy
 - psutil
 - scipy
 
 - pip:
   - mpi4py
-#  - pycuda
+ # - pycuda
   - terminaltables
   - tqdm