diff --git a/requirements.txt b/requirements.txt
index 7ee11ca..e701ba5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,6 @@ scipy==1.3.1
 sentencepiece==0.1.83
 tokenizers==0.8.0
 tqdm==4.36.1
-ujson==1.35
+ujson==5.2.0
 XlsxWriter==1.2.2