diff --git a/requirements.txt b/requirements.txt
index 3efefa5..44ee1c8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ spacy==2.0.18
 thinc==6.12.1
 toolz==0.9.0
 tqdm==4.31.1
-ujson==1.35
+ujson==5.2.0
 urllib3==1.24.1
 watson-developer-cloud==2.8.0
 websocket-client==0.48.0