diff --git a/server/requirements.txt b/server/requirements.txt
index bef7c14d..7b6d53cf 100644
--- a/server/requirements.txt
+++ b/server/requirements.txt
@@ -10,3 +10,4 @@ pycodestyle>=2.0.0
 scipy>=0.18.1
 elasticsearch>=5.0.0
 elasticsearch-dsl>=5.0.0
+skimage>=0.12