diff --git a/requirements.txt b/requirements.txt
index a8d691c5d..499c7e01b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -216,3 +216,8 @@ tzlocal==1.2 --hash=sha256:438f122d684c951b22cb98aecc80fdb961b84e69542bf878c6b9a
 futures==3.0.3 \
     --hash=sha256:04afa2a06ab7dcca9d81717b420a7a14826061e9b2614a5c77dd24c75ccf97e4 \
     --hash=sha256:2fe2342bb4fe8b8e217f0d21b5921cbe5408bf966d9f92025e707e881b198bed
+six==1.10.0 \
+    --hash=sha256:0ff78c403d9bccf5a425a6d31a12aa6b47f1c21ca4dc2573a7e2f32a97335eb1 \
+    --hash=sha256:105f8d68616f8248e24bf0e9372ef04d3cc10104f1980f54d57b2ce73a5ad56a
+html5lib==0.9999999 \
+    --hash=sha256:2612a191a8d5842bfa057e41ba50bbb9dcb722419d2408c78cff4758d0754868