diff --git a/CHANGELOG b/CHANGELOG
index d049ea26867..355a5a3e34f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+== 4.0.1 2015-05-06
+* Fix a compiler warning
+
 == 4.0.0 2015-05-06
 * Remove STPPaymentPresenter
 * Support for latest ApplePayStubs
diff --git a/Stripe.podspec b/Stripe.podspec
index 79abc40caca..af0b6cc5449 100644
--- a/Stripe.podspec
+++ b/Stripe.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name                           = 'Stripe'
-  s.version                        = '4.0.0'
+  s.version                        = '4.0.1'
   s.summary                        = 'Stripe is a web-based API for accepting payments online.'
   s.license                        = { :type => 'MIT', :file => 'LICENSE' }
   s.homepage                       = 'https://stripe.com/docs/mobile/ios'
diff --git a/Stripe/Checkout/STPCheckoutOptions.m b/Stripe/Checkout/STPCheckoutOptions.m
index b43e8c1a6b0..b14ce22f1dd 100644
--- a/Stripe/Checkout/STPCheckoutOptions.m
+++ b/Stripe/Checkout/STPCheckoutOptions.m
@@ -69,14 +69,18 @@ - (NSString *)stringifiedJSONRepresentation {
 
 - (void)setLogoImage:(STP_IMAGE_CLASS * __stp_nullable)logoImage {
     _logoImage = logoImage;
+    NSString *base64;
 #if TARGET_OS_IPHONE
-    NSString *base64 = [UIImagePNGRepresentation(logoImage) base64Encoding];
+    NSData *pngRepresentation = UIImagePNGRepresentation(logoImage);
+    if ([pngRepresentation respondsToSelector:@selector(base64EncodedStringWithOptions:)]) {
+        base64 = [pngRepresentation base64EncodedStringWithOptions:0];
+    }
 #else
     NSData *imageData = [logoImage TIFFRepresentation];
     NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
     imageData = [imageRep representationUsingType:NSPNGFileType
                                        properties:@{NSImageCompressionFactor: @1.0}];
-    NSString *base64 = [imageData base64EncodedStringWithOptions:0];
+    base64 = [imageData base64EncodedStringWithOptions:0];
 #endif
     if (base64) {
         NSString *dataURLString = [NSString stringWithFormat:@"data:png;base64,%@", base64];
diff --git a/Stripe/PublicHeaders/STPAPIClient.h b/Stripe/PublicHeaders/STPAPIClient.h
index 4124694cde8..19437a9ed01 100644
--- a/Stripe/PublicHeaders/STPAPIClient.h
+++ b/Stripe/PublicHeaders/STPAPIClient.h
@@ -9,7 +9,7 @@
 #import <Foundation/Foundation.h>
 #import "STPNullabilityMacros.h"
 
-static NSString *const __stp_nonnull STPSDKVersion = @"4.0.0";
+static NSString *const __stp_nonnull STPSDKVersion = @"4.0.1";
 
 @class STPBankAccount, STPCard, STPToken;
 
diff --git a/VERSION b/VERSION
index fcdb2e109f6..1454f6ed4b7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.0
+4.0.1