diff --git a/requirements.txt b/requirements.txt
index 24ae7f7d492151d606535d79e580bde6f2758676..c902fc6b1b057d98c40a3e163e9ade23c5ddbc12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,5 @@ scipy>=0.18,<1
 nibabel==2.*
 indexed_gzip>=0.6.1,<1
 wxpython>=3.0.2.0,<4.1
+trimesh==2
+rtree==0.8