diff --git a/requirements.txt b/requirements.txt
index 42c534c..07bfb16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,5 @@ python-mimeparse==1.6.0
 requests==2.19.1
 six==1.11.0
 SolrClient==0.2.1
+ujson==1.35
 urllib3==1.23