diff --git a/requirements.txt b/requirements.txt
index 6666100..6fa77c0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ deap==1.2.2
 decorator==4.2.1
 entrypoints==0.2.3
 enum34==1.1.6
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 ipykernel==4.8.1
 ipython==6.2.1