diff --git a/requirements.txt b/requirements.txt
index 7c69cc2..24c37ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ grpcio==1.11.0
 gym==0.10.9
 gym-unity==0.4.1
 h5py==2.9.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.7
 imageio==2.4.1
 importlib-metadata==0.8