diff --git a/tools/requirements.txt b/tools/requirements.txt
index db16da4..a06a5f0 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -21,7 +21,7 @@ docopt==0.6.2
 gast==0.2.0
 grpcio==1.16.0
 h5py==2.8.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 ipython-genutils==0.2.0
 isort==4.3.4