diff --git a/install/bob-devel.yml b/install/bob-devel.yml
index c565c7c67e0b9b8418f377284fb2ca637156c0e9..487fa82e301717565d342e026335111a089fcbb8 100644
--- a/install/bob-devel.yml
+++ b/install/bob-devel.yml
@@ -3,7 +3,7 @@ channels:
 - https://www.idiap.ch/software/bob/conda
 - defaults
 dependencies:
-- python
+- python=2.7
 - cython
 - dask
 - hdf5