diff --git a/ChineseSegmentation/requirements.txt b/ChineseSegmentation/requirements.txt
index a3c8279..753b5eb 100644
--- a/ChineseSegmentation/requirements.txt
+++ b/ChineseSegmentation/requirements.txt
@@ -18,7 +18,7 @@ decorator==4.1.2
 docopt==0.6.1
 entrypoints==0.2.3
 gensim==2.2.0
-html5lib==0.9999999
+html5lib==0.99999999
 idna==2.5
 ipykernel==4.6.1
 ipython==6.1.0