diff --git a/practical-reinforcement-learning/week_6/seq2seq/requirements_seq2seq.txt b/practical-reinforcement-learning/week_6/seq2seq/requirements_seq2seq.txt
index 7c54939..aff8c35 100644
--- a/practical-reinforcement-learning/week_6/seq2seq/requirements_seq2seq.txt
+++ b/practical-reinforcement-learning/week_6/seq2seq/requirements_seq2seq.txt
@@ -22,7 +22,7 @@ google-pasta==0.1.8
 grpcio==1.26.0
 gym==0.15.4
 h5py==2.10.0
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.8
 imageio==2.6.1
 importlib-metadata==1.4.0