commit 7921dbe9aa7bf13f2b20a55bd7e22354be5194e7
Author: zhoulinhui <df.some@foxmail.com>
Date:   Thu Sep 10 23:03:02 2020 +0800

    Fix l-c testing for Ubuntu Focal (py38)
    
    Change-Id: Icb28121e7a2f44af27dfa2767a4475ede4c6a583
    Story: 2007865
    Task: 40199
    Closes-Bug: #1886298
    (cherry picked from commit ab235df2fba3852888855b1f92c263befd0891d4)

diff --git a/lower-constraints.txt b/lower-constraints.txt
index fc4b1bb..d221197 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -34,7 +34,7 @@ future==0.16.0
 futurist==1.6.0
 glance-store==0.26.1
 google-auth==1.4.1
-greenlet==0.4.13
+greenlet==0.4.15
 heat-translator==2.0.0
 idna==2.6
 imagesize==1.0.0