diff --git a/requirements.txt b/requirements.txt
index 63e03d558..fcecc7890 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,6 +12,7 @@ catalogue>=2.0.6,<2.1.0
 typer>=0.3.0,<0.8.0
 pathy>=0.10.0
 smart-open>=5.2.1,<7.0.0
+weasel>=0.1.0rc1
 # Third party dependencies
 numpy>=1.15.0
 requests>=2.13.0,<3.0.0