diff --git a/modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache b/modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache
index 10cb6528d8..d2acc529b5 100644
--- a/modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache
+++ b/modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache
@@ -483,7 +483,7 @@ static NSString * {{classPrefix}}__fileNameForResponse(NSURLResponse *response)
 
     if (config.sslCaCert) {
         NSData *certData = [NSData dataWithContentsOfFile:config.sslCaCert];
-        [securityPolicy setPinnedCertificates:@[certData]];
+        [securityPolicy setPinnedCertificates:[NSSet setWithObject:certData]];
     }
 
     if (config.verifySSL) {
diff --git a/modules/swagger-codegen/src/main/resources/objc/podspec.mustache b/modules/swagger-codegen/src/main/resources/objc/podspec.mustache
index ecacd4aa0a..1506c220e0 100644
--- a/modules/swagger-codegen/src/main/resources/objc/podspec.mustache
+++ b/modules/swagger-codegen/src/main/resources/objc/podspec.mustache
@@ -30,7 +30,7 @@ Pod::Spec.new do |s|
     s.public_header_files = '{{podName}}/**/*.h'
 {{#useCoreData}}    s.resources      = '{{podName}}/**/*.{xcdatamodeld,xcdatamodel}'{{/useCoreData}}
 
-    s.dependency 'AFNetworking', '~> 3'
+    s.dependency 'AFNetworking', '~> 3.1'
     s.dependency 'JSONModel', '~> 1.4'
     s.dependency 'ISO8601', '~> 0.5'
 end
diff --git a/samples/client/petstore/objc/default/SwaggerClient.podspec b/samples/client/petstore/objc/default/SwaggerClient.podspec
index 934e35a2a6..bebefdfc4a 100644
--- a/samples/client/petstore/objc/default/SwaggerClient.podspec
+++ b/samples/client/petstore/objc/default/SwaggerClient.podspec
@@ -30,7 +30,7 @@ Pod::Spec.new do |s|
     s.public_header_files = 'SwaggerClient/**/*.h'
 
 
-    s.dependency 'AFNetworking', '~> 3'
+    s.dependency 'AFNetworking', '~> 3.1'
     s.dependency 'JSONModel', '~> 1.2'
     s.dependency 'ISO8601', '~> 0.5'
 end
diff --git a/samples/client/petstore/objc/default/SwaggerClient/Core/SWGApiClient.m b/samples/client/petstore/objc/default/SwaggerClient/Core/SWGApiClient.m
index f004200b2e..c3c1bc453c 100644
--- a/samples/client/petstore/objc/default/SwaggerClient/Core/SWGApiClient.m
+++ b/samples/client/petstore/objc/default/SwaggerClient/Core/SWGApiClient.m
@@ -483,7 +483,7 @@ static NSString * SWG__fileNameForResponse(NSURLResponse *response) {
 
     if (config.sslCaCert) {
         NSData *certData = [NSData dataWithContentsOfFile:config.sslCaCert];
-        [securityPolicy setPinnedCertificates:@[certData]];
+        [securityPolicy setPinnedCertificates:[NSSet setWithObject:certData]];
     }
 
     if (config.verifySSL) {