diff --git a/lower-constraints.txt b/lower-constraints.txt
index e6a552bc7..1f71b24cd 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -32,7 +32,7 @@ msgpack-python==0.5.6
 netaddr==0.7.18
 netifaces==0.10.4
 os-client-config==1.29.0
-os-resource-classes==0.5.0
+os-resource-classes==1.0.0
 os-service-types==1.2.0
 os-traits==2.5.0
 oslo.concurrency==3.26.0
diff --git a/requirements.txt b/requirements.txt
index 0a01ec468..15b144145 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,6 +21,6 @@ oslo.policy>=3.6.0 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 oslo.upgradecheck>=1.3.0 # Apache-2.0
 # NOTE(efried): Sync lower-constraints.txt for os-traits & os-resource-classes.
-os-resource-classes>=0.5.0 # Apache-2.0
+os-resource-classes>=1.0.0 # Apache-2.0
 os-traits>=2.5.0 # Apache-2.0
 microversion-parse>=0.2.1 # Apache-2.0