diff --git a/env.yml b/env.yml
index 0fb13a8..5a4437d 100644
--- a/env.yml
+++ b/env.yml
@@ -1,6 +1,7 @@
 name: BICE
 channels:
 - defaults
+- free
 dependencies:
 - boost=1.61.0=py36_0
 - cycler=0.10.0=py36_0