diff --git a/requirements.txt b/requirements.txt
index 2c04e1d..3a11ca9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,7 @@
 Jinja2==2.7.3
 Markdown==2.6
 MarkupSafe==0.23
+Pillow==3.1.0
 python-dateutil==2.4.2
 six==1.10.0
+wheel==0.24.0