diff --git a/requirements.txt b/requirements.txt
index 4cbe9de..e2bbe5d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Flask-Cors==3.0.7
 Flask-WTF==0.14.2
 glob2==0.6
 h5py==2.8.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.8
 imagesize==1.1.0
 itsdangerous==1.1.0