diff --git a/requirements.txt b/requirements.txt
index 24ae7f7d492151d606535d79e580bde6f2758676..7de74db66da42228d0908d137e59cbec5836d841 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ scipy>=0.18,<1
 nibabel==2.*
 indexed_gzip>=0.6.1,<1
 wxpython>=3.0.2.0,<4.1
+pydicom==0.9.9