diff --git a/requirements.txt b/requirements.txt
index 6778d8cc..e908a5b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 arrow==0.14.5
 aspy.yaml==1.3.0
 attrs==18.2.0
+blinker==1.4
 certifi==2018.11.29
 cfgv==2.0.1
 chardet==3.0.4