diff --git a/python/requirements.txt b/python/requirements.txt
index 908373bf452..6a90fd6f5b4 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -14,3 +14,4 @@ python-dateutil>=1.4,<2
 protobuf>=2.5.0
 python-gflags>=2.0
 pyyaml>=3.10
+Pillow>=2.7.0