diff --git a/requirements.txt b/requirements.txt
index 8d73062..d81a24a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -56,7 +56,7 @@ greenlet==0.4.13
 grpcio==1.16.1
 h5py==2.8.0
 heapdict==1.0.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 imageio==2.3.0
 imagesize==1.0.0