diff --git a/upper-constraints.txt b/upper-constraints.txt
index 793baaa2b4..d0f2820596 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -182,7 +182,7 @@ soupsieve===1.9.5;python_version=='2.7'
 soupsieve===2.0;python_version=='3.6'
 soupsieve===2.0;python_version=='3.7'
 sqlparse===0.3.0
-oslotest===3.9.0
+oslotest===4.0.0
 jsonpointer===2.0
 defusedxml===0.6.0
 netaddr===0.7.19