diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index becfb83ab3..f8d9aeab24 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -499,7 +499,7 @@ - (void)cancel {
 - (void)cancelConnection {
     NSDictionary *userInfo = nil;
     if ([self.request URL]) {
-        userInfo = [NSDictionary dictionaryWithObject:[self.request URL] forKey:NSURLErrorFailingURLErrorKey];
+        userInfo = @{NSURLErrorFailingURLErrorKey : [self.request URL]};
     }
     NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:userInfo];
 
diff --git a/AFNetworking/AFURLRequestSerialization.m b/AFNetworking/AFURLRequestSerialization.m
index 8f602bce86..231daa19ba 100644
--- a/AFNetworking/AFURLRequestSerialization.m
+++ b/AFNetworking/AFURLRequestSerialization.m
@@ -136,7 +136,7 @@ - (NSString *)URLEncodedStringValueWithEncoding:(NSStringEncoding)stringEncoding
         NSDictionary *dictionary = value;
         // Sort dictionary keys to ensure consistent ordering in query string, which is important when deserializing potentially ambiguous sequences, such as an array of dictionaries
         for (id nestedKey in [dictionary.allKeys sortedArrayUsingDescriptors:@[ sortDescriptor ]]) {
-            id nestedValue = [dictionary objectForKey:nestedKey];
+            id nestedValue = dictionary[nestedKey];
             if (nestedValue) {
                 [mutableQueryStringComponents addObjectsFromArray:AFQueryStringPairsFromKeyAndValue((key ? [NSString stringWithFormat:@"%@[%@]", key, nestedKey] : nestedKey), nestedValue)];
             }
@@ -218,9 +218,9 @@ - (instancetype)init {
 #pragma clang diagnostic ignored "-Wgnu"
 #if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
     // User-Agent Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43
-    userAgent = [NSString stringWithFormat:@"%@/%@ (%@; iOS %@; Scale/%0.2f)", [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleExecutableKey] ?: [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleIdentifierKey], [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"] ?: [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], [[UIScreen mainScreen] scale]];
+    userAgent = [NSString stringWithFormat:@"%@/%@ (%@; iOS %@; Scale/%0.2f)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion], [[UIScreen mainScreen] scale]];
 #elif defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
-    userAgent = [NSString stringWithFormat:@"%@/%@ (Mac OS X %@)", [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleExecutableKey] ?: [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleIdentifierKey], [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"] ?: [[[NSBundle mainBundle] infoDictionary] objectForKey:(__bridge NSString *)kCFBundleVersionKey], [[NSProcessInfo processInfo] operatingSystemVersionString]];
+    userAgent = [NSString stringWithFormat:@"%@/%@ (Mac OS X %@)", [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleExecutableKey] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleIdentifierKey], [[NSBundle mainBundle] infoDictionary][@"CFBundleShortVersionString"] ?: [[NSBundle mainBundle] infoDictionary][(__bridge NSString *)kCFBundleVersionKey], [[NSProcessInfo processInfo] operatingSystemVersionString]];
 #endif
 #pragma clang diagnostic pop
     if (userAgent) {
@@ -730,7 +730,7 @@ - (BOOL)appendPartWithFileURL:(NSURL *)fileURL
     bodyPart.headers = mutableHeaders;
     bodyPart.boundary = self.boundary;
     bodyPart.body = fileURL;
-    bodyPart.bodyContentLength = [[fileAttributes objectForKey:NSFileSize] unsignedLongLongValue];
+    bodyPart.bodyContentLength = [fileAttributes[NSFileSize] unsignedLongLongValue];
     [self.bodyStream appendHTTPBodyPart:bodyPart];
 
     return YES;
@@ -873,7 +873,7 @@ - (void)setInitialAndFinalBoundaries {
             bodyPart.hasFinalBoundary = NO;
         }
 
-        [[self.HTTPBodyParts objectAtIndex:0] setHasInitialBoundary:YES];
+        [[self.HTTPBodyParts firstObject] setHasInitialBoundary:YES];
         [[self.HTTPBodyParts lastObject] setHasFinalBoundary:YES];
     }
 }
diff --git a/AFNetworking/AFURLResponseSerialization.m b/AFNetworking/AFURLResponseSerialization.m
index b8e4d1c953..6fcf1fd681 100644
--- a/AFNetworking/AFURLResponseSerialization.m
+++ b/AFNetworking/AFURLResponseSerialization.m
@@ -68,11 +68,11 @@ static id AFJSONObjectByRemovingKeysWithNullValues(id JSONObject, NSJSONReadingO
     } else if ([JSONObject isKindOfClass:[NSDictionary class]]) {
         NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithDictionary:JSONObject];
         for (id <NSCopying> key in [(NSDictionary *)JSONObject allKeys]) {
-            id value = [(NSDictionary *)JSONObject objectForKey:key];
+            id value = (NSDictionary *)JSONObject[key];
             if (!value || [value isEqual:[NSNull null]]) {
                 [mutableDictionary removeObjectForKey:key];
             } else if ([value isKindOfClass:[NSArray class]] || [value isKindOfClass:[NSDictionary class]]) {
-                [mutableDictionary setObject:AFJSONObjectByRemovingKeysWithNullValues(value, readingOptions) forKey:key];
+                mutableDictionary[key] = AFJSONObjectByRemovingKeysWithNullValues(value, readingOptions);
             }
         }
 
diff --git a/Example/Classes/Controllers/GlobalTimelineViewController.m b/Example/Classes/Controllers/GlobalTimelineViewController.m
index 3529ff4869..c70f1c0420 100644
--- a/Example/Classes/Controllers/GlobalTimelineViewController.m
+++ b/Example/Classes/Controllers/GlobalTimelineViewController.m
@@ -83,7 +83,7 @@ - (UITableViewCell *)tableView:(UITableView *)tableView
         cell = [[PostTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
     }
     
-    cell.post = [self.posts objectAtIndex:(NSUInteger)indexPath.row];
+    cell.post = self.posts[(NSUInteger)indexPath.row];
     
     return cell;
 }
@@ -93,7 +93,7 @@ - (UITableViewCell *)tableView:(UITableView *)tableView
 - (CGFloat)tableView:(__unused UITableView *)tableView
 heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
-    return [PostTableViewCell heightForCellWithPost:[self.posts objectAtIndex:(NSUInteger)indexPath.row]];
+    return [PostTableViewCell heightForCellWithPost:self.posts[(NSUInteger)indexPath.row]];
 }
 
 - (void)tableView:(UITableView *)tableView
diff --git a/Tests/Tests/1.0 Tests/AFHTTPClientTests.m b/Tests/Tests/1.0 Tests/AFHTTPClientTests.m
index c43fe9eebc..5325bc055a 100644
--- a/Tests/Tests/1.0 Tests/AFHTTPClientTests.m	
+++ b/Tests/Tests/1.0 Tests/AFHTTPClientTests.m	
@@ -281,8 +281,8 @@ - (void)testThatEnqueueBatchOfHTTPRequestOperationsConstructsOperationsWithAppro
     expect(operations).notTo.beNil();
     expect(operations).to.haveCountOf(2);
 
-    expect([[operations objectAtIndex:0] class]).to.equal([AFJSONRequestOperation class]);
-    expect([[operations objectAtIndex:1] class]).to.equal([AFImageRequestOperation class]);
+    expect([operations[0] class]).to.equal([AFJSONRequestOperation class]);
+    expect([operations[1] class]).to.equal([AFImageRequestOperation class]);
 }
 
 - (void)testThatEnqueueBatchOfHTTPRequestOperationsEnqueuesOperationsInTheCorrectOrder {
@@ -313,8 +313,8 @@ - (void)testThatEnqueueBatchOfHTTPRequestOperationsEnqueuesOperationsInTheCorrec
 
     expect(operations).to.haveCountOf(2);
 
-    expect([operations objectAtIndex:0]).to.equal(firstOperation);
-    expect([operations objectAtIndex:1]).to.equal(secondOperation);
+    expect(operations[0]).to.equal(firstOperation);
+    expect(operations[1]).to.equal(secondOperation);
 
     expect(batchedOperation).notTo.beNil();
     expect(batchedOperation).to.beKindOf([NSBlockOperation class]);
diff --git a/Tests/Tests/AFSecurityPolicyTests.m b/Tests/Tests/AFSecurityPolicyTests.m
index 8251a7c1fa..a9582640c2 100644
--- a/Tests/Tests/AFSecurityPolicyTests.m
+++ b/Tests/Tests/AFSecurityPolicyTests.m
@@ -127,7 +127,7 @@ static SecCertificateRef AFUTSelfSignedCertificateWithDNSNameDomain() {
 }
 
 static SecTrustRef AFUTTrustWithCertificate(SecCertificateRef certificate) {
-    NSArray *certs  = [NSArray arrayWithObject:(__bridge id)(certificate)];
+    NSArray *certs  = @[(__bridge id)(certificate)];
 
     SecPolicyRef policy = SecPolicyCreateBasicX509();
     SecTrustRef trust = NULL;