Updated from global requirements

Change-Id: I958576f5679ed176107d9cb9a4bf0dd1ff00b054
diff --git a/requirements.txt b/requirements.txt
index d9a9ebb..124da7a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@
 oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
 oslo.log>=3.11.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
-oslo.utils>=3.18.0 # Apache-2.0
+oslo.utils>=3.20.0 # Apache-2.0
 six>=1.9.0 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
 PyYAML>=3.10.0 # MIT