diff --git a/upper-constraints.txt b/upper-constraints.txt
index 3d3dac1f99..d9c3332332 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -24,7 +24,7 @@ sphinxcontrib-actdiag===2.0.0;python_version=='3.7'
 docopt===0.6.2
 pecan===1.3.3
 ryu===4.32
-os-api-ref===1.6.2
+os-api-ref===2.0.0
 python-ldap===3.2.0
 oslo.concurrency===3.31.0;python_version=='2.7'
 oslo.concurrency===4.0.0;python_version=='3.6'