diff --git a/requirements.txt b/requirements.txt
index adea3ff..67de39d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 argh
+blinker
 Jinja2
 Markdown
 Pillow
diff --git a/setup.py b/setup.py
index 664373f..cc3277d 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 import os
 from setuptools import setup
 
-requires = ['argh', 'jinja2', 'Markdown', 'Pillow', 'pilkit']
+requires = ['argh', 'blinker', 'jinja2', 'Markdown', 'Pillow', 'pilkit']
 
 entry_points = {
     'console_scripts': ['sigal = sigal:main']