diff --git a/FirebaseRemoteConfig/CHANGELOG.md b/FirebaseRemoteConfig/CHANGELOG.md
index 62047c8e55b..063c96be63d 100644
--- a/FirebaseRemoteConfig/CHANGELOG.md
+++ b/FirebaseRemoteConfig/CHANGELOG.md
@@ -1,3 +1,6 @@
+# Unreleased
+- [fixed] Mark ConfigUpdateListenerRegistration Sendable. (#14215)
+
 # 11.5.0
 - [fixed] Mark two internal properties as `atomic` to prevent concurrency
   related crash. (#13898)
diff --git a/FirebaseRemoteConfig/Sources/Public/FirebaseRemoteConfig/FIRRemoteConfig.h b/FirebaseRemoteConfig/Sources/Public/FirebaseRemoteConfig/FIRRemoteConfig.h
index 0a45617545f..76b4f6fc690 100644
--- a/FirebaseRemoteConfig/Sources/Public/FirebaseRemoteConfig/FIRRemoteConfig.h
+++ b/FirebaseRemoteConfig/Sources/Public/FirebaseRemoteConfig/FIRRemoteConfig.h
@@ -38,6 +38,7 @@ extern NSString *const _Nonnull FIRRemoteConfigThrottledEndTimeInSecondsKey NS_S
  * RC backend is closed. Subsequently calling `addOnConfigUpdateListener` will re-open the
  * connection.
  */
+NS_SWIFT_SENDABLE
 NS_SWIFT_NAME(ConfigUpdateListenerRegistration)
 @interface FIRConfigUpdateListenerRegistration : NSObject
 /**