diff --git a/lower-constraints.txt b/lower-constraints.txt
index e0e19e964..a51f4cf14 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -27,7 +27,7 @@ oslo.log==3.36.0
 oslo.messaging==5.29.0
 oslo.middleware==3.31.0
 oslo.policy==1.30.0
-oslo.serialization==2.18.0
+oslo.serialization==2.21.1
 oslo.service==1.24.0
 oslo.utils==3.37.0
 oslosphinx==4.7.0
diff --git a/requirements.txt b/requirements.txt
index 82b984ec8..e2c1a283e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=1.30.0 # Apache-2.0
 oslo.utils>=3.37.0 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
-oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
+oslo.serialization>=2.21.1 # Apache-2.0
 oslo.service!=1.28.1,>=1.24.0 # Apache-2.0
 osprofiler>=1.4.0 # Apache-2.0
 paramiko>=2.4.1 # LGPLv2.1+