diff --git a/upper-constraints.txt b/upper-constraints.txt
index 8894212c33..ae79ddabab 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -141,7 +141,7 @@ funcparserlib===0.3.6
 funcsigs===1.0.2;python_version=='2.7'
 functools32===3.2.3.post2;python_version=='2.7'
 futures===3.0.5
-futurist===0.20.0
+futurist===0.21.0
 gabbi===1.30.2
 gitdb===0.6.4
 gitdb2===2.0.0