diff --git a/requirements.txt b/requirements.txt
index 7b495e6..98e8259 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,6 +18,7 @@ ephem==3.7.6.0
 idna==2.5
 incremental==16.10.1
 jdatetime==1.8.2
+json==2.0.9
 lxml==3.7.3
 packaging==16.8
 parsel==1.1.0