diff --git a/upper-constraints.txt b/upper-constraints.txt
index ac00dca763..c0f001d36b 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -517,8 +517,8 @@ opentracing===2.3.0
 XStatic-Rickshaw===1.5.0.0
 iso8601===0.1.12
 tooz===1.67.2;python_version=='2.7'
-tooz===2.2.0;python_version=='3.6'
-tooz===2.2.0;python_version=='3.7'
+tooz===2.3.0;python_version=='3.6'
+tooz===2.3.0;python_version=='3.7'
 linecache2===1.0.0
 oauth2client===4.1.3
 idna===2.9