diff --git a/requirements.txt b/requirements.txt
index fb90a4d..3da4186 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ chardet==3.0.4
 colorama==0.3.9
 decorator==4.1.2
 entrypoints==0.2.3
-html5lib==0.9999999
+html5lib==0.999999999
 idna==2.6
 ipykernel==4.6.1
 ipython==6.1.0