diff --git a/requirements.txt b/requirements.txt
index 61066a1..063c893 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ funcsigs==1.0.2
 functools32==3.2.3.post2                                                                                    
 futures==3.0.5                                                                                              
 h5py==2.6.0                                                                                                 
-html5lib==0.999                                                                                             
+html5lib==0.999999999                                                                                             
 ipykernel==4.5.0                                                                                            
 ipython==5.1.0                                                                                              
 ipython-genutils==0.1.0