diff --git a/README.md b/README.md
index 8df8463..747c78d 100644
--- a/README.md
+++ b/README.md
@@ -122,8 +122,8 @@ NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST
     [formData appendPartWithFileData:imageData name:@"avatar" fileName:@"avatar.jpg" mimeType:@"image/jpeg"];
 }];
 
-AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];
-[operation setUploadProgressBlock:^(NSInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
+AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
+[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
     NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
 }];
 [operation start];
@@ -134,7 +134,7 @@ AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithReq
 ``` objective-c
 NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:8080/encode"]];
 
-AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];
+AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
 operation.inputStream = [NSInputStream inputStreamWithFileAtPath:[[NSBundle mainBundle] pathForResource:@"large-image" ofType:@"tiff"]];
 operation.outputStream = [NSOutputStream outputStreamToMemory];
 [operation start];