diff --git a/dubbo-common/src/main/resources/security/serialize.allowlist b/dubbo-common/src/main/resources/security/serialize.allowlist
index 7c781a1e56d..bab3d2d9326 100644
--- a/dubbo-common/src/main/resources/security/serialize.allowlist
+++ b/dubbo-common/src/main/resources/security/serialize.allowlist
@@ -83,6 +83,7 @@ java.util.Collections$EmptyList
 java.util.Collections$EmptyMap
 java.util.Collections$SingletonSet
 java.util.Collections$SingletonList
+java.util.Collections$SingletonMap
 java.util.Collections$UnmodifiableCollection
 java.util.Collections$UnmodifiableList
 java.util.Collections$UnmodifiableMap