diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b25a4b..186ba25 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# Unreleased
+- Cancel upload operation when background task expires.
+
 # v10.1.0
 - Fix `[FBLPromise HTTPBody]` SwiftUI Previews crash when using binary
   distribution. ([firebase-ios-sdk/#13318](https://github.com/firebase/firebase-ios-sdk/issues/13318),
diff --git a/GoogleDataTransport/GDTCCTLibrary/GDTCCTUploadOperation.m b/GoogleDataTransport/GDTCCTLibrary/GDTCCTUploadOperation.m
index 354d14c..0b85840 100644
--- a/GoogleDataTransport/GDTCCTLibrary/GDTCCTUploadOperation.m
+++ b/GoogleDataTransport/GDTCCTLibrary/GDTCCTUploadOperation.m
@@ -135,8 +135,9 @@ - (void)uploadTarget:(GDTCORTarget)target withConditions:(GDTCORUploadConditions
       beginBackgroundTaskWithName:@"GDTCCTUploader-upload"
                 expirationHandler:^{
                   if (backgroundTaskID != GDTCORBackgroundIdentifierInvalid) {
-                    // Cancel the upload and complete delivery.
-                    [self.currentTask cancel];
+                    // Cancel the upload. The outgoing upload network request
+                    // is not cancelled and may or may not complete delivery.
+                    [self cancel];
 
                     // End the background task.
                     backgroundTaskCompletion();
diff --git a/GoogleDataTransport/GDTCCTLibrary/Private/GDTCCTUploadOperation.h b/GoogleDataTransport/GDTCCTLibrary/Private/GDTCCTUploadOperation.h
index cfc2c48..de234d5 100644
--- a/GoogleDataTransport/GDTCCTLibrary/Private/GDTCCTUploadOperation.h
+++ b/GoogleDataTransport/GDTCCTLibrary/Private/GDTCCTUploadOperation.h
@@ -70,9 +70,6 @@ NS_ASSUME_NONNULL_BEGIN
 /** The queue on which all CCT uploading will occur. */
 @property(nonatomic, readonly) dispatch_queue_t uploaderQueue;
 
-/** The current upload task. */
-@property(nullable, nonatomic, readonly) NSURLSessionUploadTask *currentTask;
-
 @end
 
 NS_ASSUME_NONNULL_END